TECHNICAL SPECIFICATION FOR SF6 GAS INSULATED METAL ENCLOSED SWITCHGEAR (GIS)
1.1
Introduction
This specification provides for the design, manufacture with approved QAP, factory acceptance testing, packing and transporting to site , installation and commissioning, conducting site performance test as per IEC for S! gas insulated switchgear "ays complete with all necessary control and instrumentation instrumentation devices# 1.2
General
The S! gas insulated metal enclosed switchgear shall "e totally safe against inadvertent touch of any of its live constituent parts# It should "e designed for indoor application with meteorological conditions at site $winter %degC to &' deg C and Summer %& deg C to '! deg C, seismic (one) I*+ # All parts of the switchgear should "e three phase enclosed for -k* .IS# The arrangement arrangement of gas sections or compartments shall "e such as to facilitate future e/pansion of incomer "ay with any make on either end without any drilling, cutting or welding on the e/isting e0uipment# To add e0uipment, e0uipment, it shall not "e necessary to move or dislocate the e/isting switchgear s witchgear "ays# The design should "e such that all parts su"1ected to wear and tear are easily accessi"le for maintenance purposes# The e0uipment offered shall "e protected against all types of voltage surges and any e0uipment necessary to satisfy this re0uirement shall "e deemed to "e included# The re0uired overall parameters o .IS are as follows)2 Sl. No.
a+ "+ c+ d+ e+ f+ g+ h+ i+ 1+
Technical Particulars
3ated *oltage 3ated fre0uency .rounding 3ated Pow Power fre fre0uency wi withstand *ol *oltage $& min+ line to earth Imp mpuulse lse wit withhsta stands 7I8 7I8 &# ^ 94-9mi -9mic# c# Se Sec+ 8i 8ine to earth Switching impulse voltage $4-94-- mic2sec+ 3ated sh short titime wi withsta stand cu current $& sec+ 3ate ated pea eakk withs ithsttand cu curr rreent .uaranteed ma ma/imum ga gas lo losse sess or or co complete installation as well as for all individual sections in;# Seismic level
220kV System
'4 k* $rms+ 4- 56 Effectively earthed '!- k* $rms+ :&-4- k*p 2 '- kA $rms+ &-- kA $peak+ As per IEC2 !<&2-% !<&2-% 6one2I*, as per IS2&=>%,?ear2--
The metal2enclosed gas insulated switchgear, including the operating devices, accessories and au/iliary e0uip e0 uipme ment nt formi forming ng integr integral al part part the there reof, of, shall shall "e de desig signed ned,, man manuf ufact acture ured, d, assem assem"le "ledd an andd teste testedd in accordance with the IEC2 !<&2-%9IEC2!<&2-- pu"lications including their parts and supplements as amended or revised to date#
2.0 Reference Standards
The metal2enclosed gas2insulated switchgear, including the operating devices, accessories and au/iliary e0ui e0 uipme pment nt formin formingg integ integra rall pa part rt the thereo reof, f, shall shall "e design designed ed,, man manufa ufactu cture red, d, assem assem"l "led ed an andd teste testedd in accordance with the following International International Electro2technical Commission $IEC+ standards including their parts and supplements as amended or revised till date) IEC !<&2-% .as Insulated metal2enclosed metal2enclos ed switchgear switchgea r for rated voltages a"ove 4@*# IEC !-%' Common clauses for high voltage Switchgear and control2gear standards IEC IEC ! !<& <&2& 2&- - Alte Altern rnat atin ingg cur curre rent nt disc discon onne nect ctor orss $is $isol olat ator ors+ s+ and and ea eart rthi hing ng swit switch ches es## IEC !&&= !&&= Altern Alternati ating ng curren currentt disconn disconnect ectors ors## 7us2tr 7us2trans ansfer fer curre current nt switch switching ing "y "y discon disconnec nector tors# s# IEC !&&> Alternating current earthing switches# switches # Induced current switching IEC !!-''2& Current transformers IEC !!-''2 *oltage transformers IEC !-&%< 7ushings fo for alternating voltages a"ove &--- * IEC !-=4> Ca"le connections for gas2insulated switchgear IEC !!-'='=.uide .uide to to check checking ing of sulph sulphur ur he/a he/aflu fluori oride de take takenn from from elec electri trical cal e0u e0uipm ipmen entt IEC !-->>2&9' !-->>2&9' on2linear on2linear resistor type arresters for AC systems IEC !!-'%> actory2"uilt ass asseem"lies of of lo low2voltage sw switchgear an and co control ge gear# IEC !-' !-'< < 3eport 3eport on on synthe synthetic tic testi testing ng of high high2vo 2volta ltage ge alter alterna natin tingg curre current nt circui circuitt "reake "reaker# r# IEEE IEEE =- $-$---+ -+ IEEE IEEE .uid .uidee for for Safe Safety ty in AC Su"s Su"sta tatition on grou ground ndin ing# g# CI.3E2'' Earthing of of .I .IS2 an an ap application gu guide# $E $Electra no no#&4&, Be Bec>%+ The components and devices which are not covered "y the a"ove standards shall conform to, and comply with, with, the latest latest ap appli plica" ca"le le stand standard ards, s, rules rules,, codes codes an andd regul regulati ations ons of the intern internati ation onal ally ly recog recogni ni(ed (ed standardi(ing "odies and professional societies as may "e approved "y the Purchaser# The manufacturer shall list all applica"le standardsD codes etc# and provide copies thereof for necessary approval# In case the re0uirements laid down herein differ from those given in a"ove standard in any aspect the switchgear shall comply with the re0uirements indicated herein in regard thereto#
3.0 efinitions 3.1 !ssem"ly
Assem"ly refers refers to the entire entire completed completed .IS e0uipment e0uipment furnished furnished under under contract# contract# 3.2 #ay
7ay refers to the area occupied "y one Circuit 7reaker and associated e0uipments used to protect one feeder9line9 in single "us scheme as per the approved single line diagram of the purchaser # 3.3 $om%artment
hen used in con1unction with .IS e0uipment, compartment refers to a gas tight volume "ounded "y enclosure walls and gas tight isolating "arriers# 3.& 'nclosure
hen used in con1unction with .IS e0uipment, enclosure refers to the grounded grounded metal housing or shell which contains and protects internal power system e0uipments $"reaker, disconnecting switch, grounding switch, voltage transformer, current transformer surge arresters, interconnecting "us etc#+ 3.( )anual *%erations
Fanual operation means operation "y hand without using any other source of Power# 3.+ )odule
hen used in con1unction with .IS e0uipment, module refers to a portion of that e0uipment# Each module includes its own enclosure# A module can contain more than one piece of e0uipment, for e/ample, a module can contain a disconnecting switch and a grounding switch# 3., Reser-oir
hen used in con1unction with .IS e0uipment reservoir refers to a larger gastight volume# &.0 General esin / Safety Reuirement.
The .IS assem"ly shall consist of separate modular compartments e#g# Circuit 7reaker compartment, 7us "ar compartment filled with S! .as and separated "y gas tight partitions so as to minimi(e risk to human life, allow ease of maintenance and limit the effects of gas leaks failures G internal arcs etc# These compartments shall "e such that maintenance on one "us"ar9 compartment may "e performed without de2 energi(ing the ad1acent "us"ar9 feeders# These compartments shall "e designed to minimi(e the risk of damage to ad1acent sections and protection of personnel in the event of a failure occurring within the compartments# compartments# 3upture diaphragms with suita"le deflectors shall "e provided to prevent uncontrolled uncontrolled "ursting of pressures developing within the enclosures under worst operating conditions#
&.01
The workmanship shall "e of the highest 0uality and shall conform to the latest modern practices for the manufacture of high technology machinery and electrical switchgear#
&.02
The switchgear, which shall "e of modular design, shall have complete phase isolation for -k* .IS# The conductors and the live parts shall "e mounted on high graded epo/y resin insulators# These insulators shall "e designed to have high structural strength and electrical dielectric properties and shall "e shaped so as to provide uniform field distri"ution and to minimi(e the effects of particle deposition either from migration of foreign particles within the enclosures or from the "y2products of S! "reakdown under arcing conditions#
&.03
.as "arrier insulators and support insulators shall have the same "asis of design# The support insulators shall have holes on "oth sides for proper flow of gas#
&.0&
.as "arrier insulators shall "e provided so as to divide the .IS into separate compartments# They shall "e suita"ly located in order to minimi(e distur"ance in case of leakage or dismantling# They shall "e designed to withstand any internal fault there"y keeping an internal arc inside the faulty compartment# Bue to safety re0uirement for working on this pressuri(ed e0uipment, whenever the pressure of the ad1acent gas compartment is reduced, it should "e ensured "y the "idder that ad1acent compartment would remain in service with reduced pressure# The gas tight "arriers shall "e clearly marked on the outside of the enclosures# &.0+ The material and thickness of the enclosures shall "e such as to withstand an internal flash over without "urn through through for a period of 4-- ms# The material shall "e such that it has no effect of environment as well as from the "yproducts of S! "reakdown under arcing condition# &.0(
Each section shall have plug2 in or easily remova"le connection connection pieces to allow for easy replacement replacement of any component with the minimum of distur"ance to the remainder of the e0uipment#
&.0,
The material used for manufacturing the switchgear e0uipment shall "e of the type, composition and have physical properties "est suited to their particular purposes and in accordance with the latest engineering engineering practices# All the conductors shall "e fa"ricated of electrolytic grade $>>#>; pure+ copper tu"es of cross sectional area suita"le to meet the normal and short circuit current rating re0uirements# The finish of the conductors shall "e smooth so as to prevent any electrical discharge# The conductor ends shall "e silver plated and fitted into finger contacts or tulip contacts# The contacts shall "e of sliding type to allow the conductors to e/pand or contract a/ially due to temperature temperature variation without imposing any mechanical stress on supporting insulators# &.0
The enclosure shall designed to withstand an e/ternal pressure of one atmosphere $with a safety factor+ with (ero internal pressure a"solute and "e designed and tested to withstand an internal pressure o times the design pressure# The enclosures shall "e divided into several compartments or sections separated "y gastight "arriers permitting removal of a section or sections from service for maintenance without affecting ad1acent sections# All the enclosures undergo hydraulic tests and leakage tests and comply with European pressure vessel code $CEE8EC+# Each pressure filled enclosure shall "e designed and fa"ricated to comply with the re0uirements of the applica"le pressure vessel codes and "ased on the design temperature and design pressures as defined in IEC2!<&2-%#
&.0
The manufacturer shall guarantee that the pressure loss within each individual gas2filled compartment shall not "e more than half percent $-#4;+ per year#
&.10
Each gas2filled compartment shall "e e0uipped with static filters, density switches, filling valve and safety diaphragm# The filters shall "e capa"le of a"sor"ing any water vapour which may penetrate into the enclosures as well as the "y2products of S! during interruption# Each gas compartment shall "e fitted with separate non2return valve connectors for evacuating G filling the gas and checking the gas pressure etc#
&.11
The switchgear line2up when installed and operating under the am"ient conditions shall perform satisfactorily and safely under all normal and fault conditions# Even repeated operations up to the permissi"le servicing intervals under &--; rated and fault conditions shall not diminish the performance or significantly shorten the useful life of the switchgear# Any fault caused "y e/ternal reasons shall "e positively confined to the originating compartment and shall not spread to other parts of the switchgear# The internal components shall "e maintenance free for at least &- years# 3outine replacements of insulating gas shall not "e re0uired in intervals of less than ten years#
&.12
The The ther therma mall rati rating ng of all all curr curren entt carr carryi ying ng pa part rtss shal shalll "e mini minimu mum m for for on onee sec# sec# for for the the rate ratedd symmetrical short2circuits current#
&.13
The switchgear shall "e of the free standing, self2supporting with easy accessi"ility to all the parts during installation G maintenance with all high voltage e0uipment installed inside gas2insulated metallic and earthed enclosures# enclosures# It shall "e suita"ly su"2divided into individual arc and gas2proof compartments for -k* .IS) a+ 7us "ars "+ Intermediate compartment c+ Circuit "reakers d+ 7us98ine disconnectors e+ *oltage Transformers f+ .as Insulated "us section "etween .IS and H8PE ca"le g+ .as Insulated "us section "etween .IS G Condenser "oosting &.1&
The arrangement of the individual switchgear "ays shall "e such as to achieve optimum space2 saving, neat and logical arrangement and ade0uate accessi"ility to all e/ternal components#
&.1(
It is re0uired that the three phases of each switchgear "ay "e arranged side "y side# The arrangement of the e0uipment offered must provide ade0uate access for operation, testing and maintenance $applica"le for -k* .IS+# &.1+
&.1,
ocal $ontrol / Su"station !utomation System45
Separate control cubicle including gas monitoring kiosk shall be provided for each bay which shall be installed near the switchgear for local control & monitoring of respective switchgear bay. Local control cubicle for GIS shall be equipped with suitable hardware & software for remote control operation and conform to the bay level controller as detailed in Section: Substation utomation System.
All the elements shall "e accessi"le without removing support structures for routine inspections and possi"le repairs# The removal of individual enclosure parts or entire "reaker "ays shall "e possi"le without distur"ing the enclosures of neigh"oring "ays# &.1
It should "e impossi"le to unwillingly touch live parts of the switchgear or to perform operations that lead to arcing faults without the use of tools or "rute force# &.1
&.20
All interlocks that prevent potentially dangerous mal2operations shall "e constructed such that they can not "e operated easily, i#e# the operator must use tools or "rute force to over2ride them# &.21
In general the contours of energi(ed metal parts of the .IS and any other accessory shall "e such, so as to eliminate areas or points of high electrostatic flu/ concentrations# or -k* .IS, the surfaces shall "e smooth with no pro1ection or irregularities which may cause visi"le corona# o corona shall "e visi"le in complete darkness which the e0uipment is su"1ected to specified test voltage# There shall "e no radio interference from the energi(ed switchgear at rated voltage# &.22
The enclosure shall "e of continuous design and shall meet the re0uirement as specified in clause no# &- $special considerations for .IS+ of IEEE2 =-, ?ear2 --- # The enclosure shall "e si(ed for carrying induced current e0ual to the rated current of the 7us# The conductor and the enclosure shall form the concentric pair with effective shielding of the field internal to the enclosure# &.23
The fa"ricated metal enclosures shall "e of Aluminium alloy having high resistance to corrosion, low electrical loses and negligi"le magnetic losses# All 1oint surfaces shall "e machined and all castings shall "e spot faced for all "olt heads or nuts and washers# All screws, "olts, studs and nuts shall conform to metric system# The other type of non2magnetic enclosures may "e considered# &.2&
The "reaker enclosure shall have provision for easy withdrawal of the interrupter assem"lies# The removed interrupter assem"ly must "e easily and safely accessi"le for inspection and possi"le repairs# &.2(
The enclosure shall "e designed to practically eliminate the e/ternal electromagnetic field and there"y electro2dynamic stresses even under short circuit conditions# &.2+
The el"ows, "ends, cross and T2sections of interconnections shall include the insulators "earing the conductor when the direction changes take place in order to ensure that live parts remain perfectly centered and the electrical field is not increased at such points# &.2,
The Average Intensity of electromagnetic field shall not "e more than 4-- micro Tesla# The contractor shall furnish all calculations and documents in support of the a"ove during detailed engineering# &.2
The 7idder shall furnish the following information regarding the loosely distri"uted metallic particles within the .IS encapsulation# &.2
a+ Calculations of critical field strength for specific particles of defined mass and geometry# "+ The methodology and all the e0uipment for electrical partial discharge $PB+ detection and9or acoustic detection methods, including that mentioned in the specification else2where# The switchgear shall have provision for connection with ground mat risers# This provision shall consist of grounding pads to "e connected to the ground mat riser in the vicinity of the e0uipment# &.30
The ladders and walkways shall "e provided wherever necessary for access to the e0uipment# A porta"le ladder with ad1usta"le height may also "e supplied to access to the e0uipment# &.31
herever re0uired, the heaters shall "e provided for the e0uipment in order to ensure the proper functioning of the switchgear at specified am"ient temperatures# The heaters shall "e rated for %-* AC supply and shall "e complete with thermostat, control switches and fuses, connected as a "alanced %2phase '2wire load# The possi"ility of using heaters without thermostats in order to achieve the higher relia"ility may "e e/amined "y the "idder and accordingly included in the offer "ut it shall "e ensured "y the "idder that the temperature rise of different enclosures where heating is provided should "e within safe limits as per relevant standards# ne copy of the relevant e/tract of standard to which the a"ove arrangement conforms along with cost reduction in offer# If any, shall also "e furnished along with the offer# The heaters shall "e so arranged and protected as to create no ha(ard to ad1acent e0uipment from the heat produced# &.32
The enclosure G support structure shall "e designed that a mechanic &<=- mm in height and >-@g in weight is a"le to clim" on the e0uipment for maintenance# &.33
The sealing provided "etween flanges of two modules 9 enclosures shall "e such that long term tightness is achieved# &.3&
Alarm circuit shall not respond to faults for momentary conditions# The following indications including those re0uired elsewhere in the specifications shall "e generally provided in the alarm and indication circuits# &.3(
&.3(.1 Gas Insulatin System4
a+ 8oss of .as Bensity# "+ 8oss of 5eater power $if re0uired+ c+ Any other alarm necessary to indicate deterioration of the gas insulating system# &.3(.2 *%eratin System)
a+ 8ow operating pressure "+ 8oss of 5eater power c+ 8oss of operating power d+ 8oss of control e+ Pole Bisordance $pole discrepancy+ &.3+
The e0uipment will "e operated under the following am"ient conditions)
a+ The am"ient temperature varies "etween % degree2C and '!degree2C# 5owever, am"ient temperature should "e considered as 4- degree2C# "+ The humidity will "e a"out >4; $indoors+ c+ The elevation is less than &--- meters# d+ Seismic (one) I*
for design purposes,
Temperature rise of current carrying parts shall "e limited to the values stipulated in IEC2!>', under rated current and the climatic conditions at site# The temperature rise for accessi"le enclosure shall not &.3,
e/ceed - degree C a"ove the am"ient temperature of 4- degree C# In the case of enclosures, which are accessi"le "ut need not "e touched during normal operation, the temperature rise limit may "e permitted up to %- degree C a"ove the am"ient of 4- degree C# In case of any internal arc fault regardless whether it occurs in a "us "ar section, a "us "ar isolator or the circuit "reaker, repair works should "e possi"le without shutting down the su"stationD at least one "us section and the undistur"ed feeder should remain in operation# It should "e possi"le to remove and replace a fully assem"led circuit "reaker without interfering the operation of the ad1acent feeder# All circuit "reakers should "e interchangea"le# &.3
The .IS e0uipments shall "e arranged in such a manner that in case of maintenance works on any of the e0uipment, at least one "us section should "e availa"le for operation# &.3
The inter "ay width shall "e sufficient to allow access to all drive mechanisms and other termination "o/es without the need of dismantling other apparatuses# &.&0
These conditions shall "e taken into account "y the supplier in the design of the e0uipment# (.0
#ello6s or $om%ensatin 7nits45
Ade0uate provision shall "e made to allow for the thermal e/pansion of the conductors and of differential thermal e/pansion "etween the conductors and the enclosures# The "ellows shall "e metallic $prefera"ly of stainless steel+ of following types or other suita"le e0uivalent arrangement shall "e provided wherever necessary# &+ 8ateral 9 *ertical mounting units) These shall "e inserted, as re0uired, "etween sections of "us "ars, on transformer and H8PE ca"le etc# 8ateral mounting shall "e made possi"le "y a sliding section of enclosure and tu"ular conductors# + A/ial compensators) These shall "e provided to accommodate changes in length of "us "ars due to temperature variations# %+ Parallel compensators) These shall "e provided to accommodate large linear tolerances#
e/pansions and angle
'+ Tolerance compensators) These shall "e provided for taking up manufacturing, site assem"ly and foundation tolerances# 4+ *i"ration compensators) These "ellow compensators shall "e provided for a"sor"ing vi"rations caused "y the transformers when connected to S! switchgear "y oil2 S! "ushings# +.0 Indication and Verification of S6itch Positions
Indicators shall "e provided on all circuit "reakers, isolators and earth switches, which shall clearly show whether the switches are open or closed# The indicators shall "e mechanically coupled directly to the main contact operating drive rod or linkages and shall "e mounted in a position where they are clearly visi"le through glass windows# ,.0 Pressure Relief45
Pressure relief devices shall "e provided in the gas sections to protect the main gas enclosures from damage or distortion during the occurrence of a"normal pressure increase or shock waves generated "y internal electrical fault arcs $prefera"ly in downward direction+# Pressure relief shall "e achieved either "y means of diaphragms or plugs venting directly into the atmosphere in a controlled direction# If the pressure relief devices vent directly into the atmosphere, suita"le guards and deflectors shall "e provided# Contractor shall su"mit to the Employer the de2tailed criteria design regarding location of pressure relief devices9rupture diaphragms#
.0 Pressure Vessel Reuirements
The enclosure shall "e designed for the mechanical and thermal loads to which it is su"1ected in service# The enclosure shall "e manufactured and tested according to the pressure vessel code $ASFE9CEE8EC code for pressure *essel#+ Each enclosure has to "e tested as a routine test at time the design pressure for one minute# The "ursting strength of Aluminium castings has to "e at least 4 times the design pressure# A "ursting pressure test shall "e carried out at 4 times the design pressure as a type test on each type of enclosure# .0 Groundin
The grounding system shall "e designed and provided as per IEEE2=-2--- and CI.3E2'' to protect operating staff against any ha(ardous touch voltages and electro2magnetic interferences# As the area involved is small, Supplier has to take special measures for the same# The .IS supplier shall define clearly what constitutes the main grounding "us of the .IS# The .IS supplier must supply the entire material for grounding "us of .IS vi(# conductor, clamps, 1oints, operating and safety platforms etc# The .IS supplier is also re0uired to supply all the earthing conductors and associated hardware material for the following) &+ Connecting all .IS e0uipment, enclosures, control ca"inets, supporting structure etc# to the ground "us of .IS# + .rounding of transformer and other outdoor switchyard e0uipments9 structures etc# The enclosure of the .IS may "e grounded at several points so that there shall "e grounded cage around all the live parts# A minimum of two nos# of grounding connections should "e provided for each of circuit "reaker, disconnect switches, ca"le terminals, surge arrestors, earth switches and at each end of the "us "ars# Su"assem"ly to su"assem"ly "onding shall "e provided to provide gap G safe voltage gradients "etween all intentionally grounded parts of the .IS assem"ly G "etween those parts and the main grounding "us of the .IS# Each marshalling "o/, local control panel, power and control ca"le sheaths and other non current carrying metallic structures shall "e connected to the grounding system of .IS via connections that are separated from .IS enclosures# The grounding connector shall "e of sufficient mechanical strength to withstand electromagnetic forces as well as capa"le of carrying the anticipated ma/imum fault current without overheating# At least two grounding paths shall "e provided to connect each point to the main grounding "us# ecessary precautions should "e under taken to prevent e/cessive currents from "eing induced into ad1acent frames, structures of reinforcing steel and to avoid esta"lishment of current loops via other station e0uipment# All fle/i"le "onding leads shall "e tinned copper# All connectors, for attaching fle/i"le "onding leads to grounding conductors and grounding conductors to support structures shall "e tinned "ron(e with stainless steel or tinned "ron(e hardware# The contractor shall provide suita"le measure to mitigate transient enclosure voltage caused "y high fre0uency currents caused "y lightning strikes, operation of surge arrestor, phase9earth fault and discharges "etween contacts during switching operation# The grounding system shall ensure safe touch G step voltages in all the enclosures# The contractor shall provide suita"le "arrier of non2linear resistor9 counter discontinued S!9 Air termination, S!9 Transformer termination, S!9 5* ca"le "ushing etc# to mitigate transient enclosure voltage# Any provision to "e made in the "uilding design to take care of earthing re0uirement shall also "e clearly spelt2out#
10 $ircuit #reakers General
S! gas insulated metal enclosed circuit "reakers shall comply with the latest revisions of IEC2 !<&2&-- G relevant IEC e/cept to the e/tent e/plicitly modified in the specification and shall meet with re0uirements specified# Circuit "reakers shall "e e0uipped with the operating mechanism# -k* S! Circuit "reakers shall "e of single pressure $puffer+ type# Complete circuit "reaker with all necessary items for successful operation shall "e supplied# The circuit "reakers shall "e designed for high speed single and three phase re2closing with an operating se0uence and timing as specified# 10.1 uty Reuirements
Circuit "reaker shall "e C 2 F&2E& class as per IEC !<&2&--# Circuit "reaker shall meet the duty re0uirements for any type of fault or fault location also for line charging and dropping when used on -k* effectively grounded system and perform make and "reak operations as per the stipulated duty cycles satisfactorily# 10.2 The circuit "reaker shall "e ca%a"le of4
i+ Interrupting the steady and transient magneti(ing current corresponding to -k* 9%%k* class transformers of % F*A ratings on -k* side# ii+ Interrupting line9ca"le charging current as per IEC without re2strikes and without resistors#
use of opening
iii+ Clearing short line fault $@ilometric faults+ with source impedance "ehind the "us e0uivalent to symmetrical fault current specified# iv+ 7reaking 4; the rated fault current at twice the rated voltage under phase opposition condition# The "reaker shall satisfactorily withstand the high stresses imposed on them during fault clearing, load re1ection and re2energisation of lines with trapped charges# 10.3 Total #reak Time
The total "reak time shall not "e e/ceeded under any of the following duties) i+ Test duties T&-,T%-,T!-,T&-- $with T3* as per IEC2 !<&2&-- + ii+ Short line fault 8>-, 8<4 $with T3* as per IEC2!<&2&-- + The 7idder may please note that total "reak time of the "reaker shall not "e e/ceeded under any duty conditions specified such as with the com"ined variation of the trip coil voltage $<-2&&-;+, spring actuating mechanism and S! gas pressure etc# hile furnishing the proof for the total "reak time of complete circuit "reaker, the "idder may specifically "ring out the effect of non simultaneity "etween poles $pole discrepancy+ and show how it is covered in the total "reak time# The values guaranteed shall "e supported with the type test reports# 10.& $onstructional 8eatures
The features and constructional details of "reakers shall "e in accordance with re0uirements stated hereunder)
10.&.1 $ontacts
All making and "reaking contactsJ shall "e sealed and free from atmospheric effects# Contacts shall "e designed to have ade0uate thermal and current carrying capacity for the duty specified and to have a life e/pectancy so that fre0uent replacement due to e/cessive "urning will not "e necessary# Provision shall "e made for rapid dissipation of heat generated "y the arc on opening# Any device provided for voltage grading to damp oscillations or, to prevent re2strike prior to the complete interruption of the circuit or to limit over voltage on closing, shall have a life e/pectancy compara"le of that of the "reaker as a whole# 10.&.2
7reakers shall "e so designed that when operated within their specified rating, the temperature o each part will "e limited to values consistent with a long life for the material used# The temperature rise shall not e/ceed that indicated in IEC 5!<&2&-- under specified am"ient conditions# 10.&.3
or -k* C#7s, the gap "etween the open contacts shall "e such that it can withstand atleast the rated phase to ground voltage for eight hours at (ero pressure a"ove atmospheric level of S! gas due to its leakage# The "reaker should "e a"le to withstand all dielectric stresses imposed on it in open condition at lockout pres2sure continuously $i#e# pu# power fre0uency voltage across the "reaker continuously+ 10.&.&
or -k* C#7s in the interrupter assem"ly there shall "e an adsor"ing product "o/ to minimi(e the effect of S! decomposition products and moisture# The material used in the construction of the circuit "reakers shall "e such as to "e fully compati"le with S! gas decomposition products# 10.&.(
Provisions shall "e made for attaching an operational analy(er to record travel, speed and making measurement of operating timings etc# after installation at site# 10.&.+
Static Contact 3esistance Feter and Bynamic Contact 3esistance Feter shall also "e provided along with C7 operational analy(er# 10.&.,
10.( *%eratin )echanism 10.(.1 General Reuirements4
a+ Circuit "reaker shall "e operated "y spring charged mechanism# The mechanism shall "e housed in a dust proof ca"inet and shall have IP) ' degree of protection# "+ The operating mechanism shall "e strong, rigid, not su"1ect to re"ound or to critical ad1ustments at site and shall "e readily accessi"le for maintenance# c+ The operating mechanism shall "e suita"le for high speed re2closing and other duties specified# Buring re2 closing the "reaker contacts shall close fully and then open# The mechanism shall "e anti2pumping and trip free $as per IEC definition+ under every method of closing# d+ The mechanism shall "e such that the failure of any au/iliary spring will not prevent tripping and will not cause trip or closing operation of the power operating devices# e+ A mechanical indicator shall "e provided to show open and close position of the "reaker# It shall "e located in a position where it will "e visi"le to a man standing on the ground level with the mechanism housing closed# An operation counter shall also "e provided in the central control ca"inet# f+ orking parts of the mechanism shall "e of corrosion resisting material, "earings which re0uire grease shall "e e0uipped with pressure type grease fittings# 7earing pin, "olts, nuts and other parts shall "e ade0uately pinned or locked to prevent loosening or changing ad1ustment with repeated operation of the "reaker#
g+ The "idder shall furnish detailed operation and maintenance manual of the mechanism along with the operation manual for the circuit "reaker# 10.(.2 $ontrol
a+ The close and trip circuits shall "e designed to permit use of momentary contact switches and push "uttons# "+ Each -k* "reaker pole shall "e provided with two $+ independent tripping circuits, valves, pressure switches, and coils each connected to a different set of protective relays# c+ The "reaker shall normally "e operated "y remote electrical control# Electrical tripping shall "e performed "y shunt trip coils# 5owever, provisions shall "e made for local electrical control# or this purpose a local9remote selector switch and close and trip control switch9push "uttons shall "e provided in the "reaker central control ca"inet# d+ The trip coil shall "e suita"le for trip circuit supervision during "oth open and close position of "reaker# e+ Closing coil and associated circuits shall operate correctly at all values of voltage "etween =4; and &&-; of the rated voltage# Shunt trip and associated circuits shall operate correctly under all operating conditions of the circuit "reaker up to the rated "reaking capacity of the circuit "reaker and at all values of supply voltage "etween <-; and &&-; of rated voltage# If additional elements are introduced in the trip coil circuit their successful operation and relia"ility for similar applications on circuit "reakers shall "e clearly "rought out in the additional information schedules# In the a"sence of ade0uate details the offer is likely to "e re1ected# f+ Bensity meter contacts and pressure switch contacts shall "e suita"le for direct use as permissive in closing and tripping circuits of su"station automation system# Separate contacts have to "e used for each o tripping and closing circuits# If contacts are not suita"ly rated and multiplying relays are used then fail safe logic9schemes are to "e employed# BC supplies for all au/iliary circuit shall "e monitored and for remote annunciations and operation lockout in case of dc failures# g+ The au/iliary switch of the "reaker shall "e positively driven "y the "reaker operating rod# 10.(.3S%rin o%erated )echanism
a+ Spring operated mechanism shall "e complete with motor in accordance with IEC# pening spring and closing spring with limit switch for automatic charging and other necessary accessories to make the mechanism a complete operating unit shall also "e provided# "+ As long as power is availa"le to the motor, a continuous se0uence of the closing and opening operations shall "e possi"le# The motor shall have ade0uate thermal rating for this duty# c+ After failure of power supply to the motor one close open operation shall "e possi"le with the energy contained in the operating mechanism# d+ 7reaker operation shall "e independent of the motor which shall "e used solely for compressing the closing spring# acility for manual charging of the closing spring shall also "e provided# The motor rating shall "e such that it re0uired prefera"ly not more than !- seconds for full charging of the closing spring# e+ Closing action of circuit "reaker shall compress the opening spring ready for tripping# f+ hen closing springs are discharged after closing a "reaker, closing springs shall automatically "e charged for the ne/t operation and an indication of this shall "e provided in the local and remote control ca"inet# g+ Provisions shall "e made to prevent a closing operation of the "reaker when the spring is in the partial charged condition#
h+ Fechanical interlocks shall "e provided in the operating mechanism to prevent discharging of closing springs when the "reaker is in the closed position# The spring operating mechanism shall have ade0uate energy stored in the operating spring to close and latch the circuit "reaker against the rated making current and also to provide the re0uired energy for the tripping mechanism in case the tripping energy is derived from the operating mechanism#
10.+ !dditional ata to #e 8urnished !lon 6ith the *ffer4
a+ Brawing showing contacts in close, arc initiation, full arcing, arc e/tinction and open position# "+ Bata on capa"ilities of circuit "reakers in terms of time and num"er of operations at duties ranging from &-- fault currents to load currents of the lowest possi"le value without re0uiring any maintenance or checks# c+ Curves supported "y test data indicating the opening time under close open operation with com"ined variation of trip coil voltage and hydraulic pressure# d+ Quality assurance plan starting from the selection and procurement of material itself till performing the shop acceptance# 10., Tests
In accordance with the re0uirements stipulated in the 7Q and in this specification of the circuit "reaker along with its operating mechanism shall conform to the type tests as per IEC2!<&2&--# 10.,.1
10.,.2 Routine Tests
3outine tests as per IEC) !<&2&-- shall "e performed on all circuit "reakers# In addition to the mechanical and electrical tests specified "y IEC, the following shall also "e performed# Speed curves for each "reaker shall "e o"tained with the help of a suita"le operation analy(er to determine the "reaker contact movement during opening, closing, auto2re2closing and trip free operation under normal as well as limiting operating conditions $control voltage, pneumatic pressure etc#+# The tests shall show the speed of contacts directly at various stages of operation, travel of contacts, opening time, closing time, shortest time "etween separation and meeting of contacts at "reak make operation etc# This test shall also "e performed at site for which the necessary operation analy(er along with necessary transducers, ca"les, console etc# shall "e furnished as mandatory maintenance e0uipment# The test for getting signature of the dynamic contact resistance measurement shall also "e carried out at factory# The test result shall "e treated as reference signature for condition monitoring in future#
10.,.3 Technical Parameters 5 $ircuit #reaker
Sl . a9
"+ c+ d+ e+ f+
g+ h+ i+ 1+
k+ l+ m + n+ o+ p+ 0+ i+
ii+
Technical %articulars
220kV
3ated voltage k* $rms+
'4
3ated fre0uency $5(+ o# of poles Type of circuit "reaker 3ated continuous current $A+ at an am"ient temperature of C 3ated short circuit capacity
4% S! insulated &!--94-- $4-- for "us coupler "reaker+ '- kA with percentage of BC component as per IEC2 !<&2&-corresponding to minimum opening conditions as specified# '-
Symmetrical interrupting capa"ility kA $rms+ 3ated short circuit making current kAp Short time current carrying capa"ility for one second kA $rms+ 3ated line charging interrupting current at >- deg# 8eading power factor angle $A rms+ $The "reaker shall "e a"le to interrupt the rated line charging current with test voltage immediately "efore opening e0ual to the product of K9L% and &#' as per IEC2 !<&2&--+ irst pole to clear factor 3ated "reak time as IEC $ms+ Total "reak time $ms+ Total closing time $ms+ 3ated operating duty cycle 3e2closing auto re2closing 3ated insulation levels ull wave impulse with stand voltage $&#/4- micro sec#+ 2 "etween line terminals and ground 2 "etween terminals with circuit "reaker open ne minute power fre0uency withstand voltage 2 "etween line terminals and ground 2 "etween terminals with circuit "reaker
&-' As per IEC
&#% !!4 ot more than -2-#%s2C2% min2C Single phase9 Three phase
:&-4- k*p :&-4- k*p
As per IEC As per IEC
r+ S+ t+ u+
open Fa/# radio interference voltage for fre0uency "etween -#4 F5( and F5( at &4! k* $Ficrovolts+ Fa/# difference in the instants of closing9opening of contacts $ms+ "etween poles Trip coil and closing coil voltage this Section Au/iliary Contacts Au/iliary switch shall also comply with re0uirements as given# Independent single pole reversi"le contacts $from to C G vice versa+
i+ ii+
3ating of Au/iliary contacts 7reaking capacity of Au/# Contacts#
v+
System neutral earthing
&-- As per IEC -* BC with variation as specified in Sec .T3 Each circuit "reaker pole shall "e provided with an au/iliary switch with -; of spare M and -; spare C contact for use in future# &-A at -* BC A BC with the circuit time constant of not less than - ms# Effectively earthed#
11.0 isconnectors :Isolators9
&&#& General Bisconnectors shall "e of the single2pole, group operated type, installed in the switchgear to provide electrical isolation of the circuit "reakers, the transformers, single "us and transmission lines9ca"les# The disconnectors shall conform to IEC2 !<&2&- and shall have the following ratings as specified# Technical Parameter S.No
Particulars
220kV
a+ "+ c+ d+ e+
3ated voltage $rms+ Kn 3ated fre0uency System earthing Type 3ated continuous current $A+ at am"ient temp#
f+
3ated short time withstand current of isolator and earth switch 3ated dynamic short circuit withstand current withstand current of isolator and earth switch 3ated insulation level) ne minute power fre0# ithstand voltage) To earth ) Across isolating distance 3ated insulation levelsD ^- micro sec# 8ighting impulse withstand voltage $Nve or Mve polarity+ To earth) Across Isolating distance 3ated mechanical terminal load o# of spare au/iliary contacts on each
g+ h+
i+
1+ k+
C
'4 k* 4- 56 Effectively earthed S! insulated &!--94--$for line, Transformer 9"us coupler+ '- kA for & Sec &-- kAp
As per IEC As per IEC
N&-4- k*p :&-- k*p As per IEC ' and ' C
l+ m+
isolator o# of spare au/iliary contacts on each earthing switch Fa/# radio interference voltage for fre0uency "etween -#4F5( and F5( at &4! k* $Ficro volts+
' and ' C &---
11.2 $onstruction / esin
The three pole group operated disconnectors shall "e operated "y electric motor suita"le for use on - * BC system and shall "e e0uipped with a manual operating mechanism for emergency use# The motor shall "e protected against over current and short circuit# 11.2.1
Bisconnectors shall "e designed as per relevant IEC# These shall "e suita"le to make and "reak the charging currents during their opening and closing# They shall also "e a"le to make and "reak loop current which appears during transfer "etween "us "ars# The contact shielding shall also "e designed to prevent re2 strikes and high local stresses caused "y transient recovery voltages when these currents are interrupted# 11.2.2
The disconnecting switches shall "e arranged in such a way that all the three phases operate simultaneously# All the parts of the operating mechanism shall "e a"le to withstand starting tor0ue of the motor mechanism without damage until the motor overload protection operates# 11.2.3
It shall "e possi"le to operate the disconnecting switches manually "y cranks or hand wheels# The contacts shall "e "oth mechanically and electrically disconnected during the manual operation# 11.2.&
The operating mechanisms shall "e complete with all necessary linkages, clamps, couplings, operating rods, support "rackets and grounding devices# All the "earings shall "e permanently lu"ricated or shall "e of such a type that no lu"rication or maintenance is re0uired# 11.2.(
The opening and closing of the disconnectors shall "e achieved "y either local or remote control# The local operation shall "e "y means of a two2position control switch located in the "ay module control ca"inet# 11.2.+
3emote control of the disconnectors from the control room shall "e made "y means of remote9 local transfer switch# 11.2.,
The disconnector operations shall "e inter2locked electrically with the associated circuit "reakers in such a way that the disconnector control is inoperative if the circuit "reaker is closed# 11.2.
Each disconnector shall "e supplied with au/iliary switch having si/ normally open and si/ normally closed contacts for future use over and a"ove those re0uired for switchgear interlocking and automation purposes# The au/iliary switch contacts are to "e continuously ad1usta"le such that, when re0uired, they can "e ad1usted to make contact "efore the main switch contacts# 11.2.
The signaling of the closed position of the disconnector shall not take place unless it is certain that the mova"le contacts will reach a position in which the rated normal current, peak withstand current and short2time withstand current can "e carried safely# 11.2.10
The signaling of the open position of the disconnector shall not take place unless the mova"le contacts have reached such a position that the clearance "etween the contacts is at least =- percent of the rated isolating distance# 11.2.11
11.2.12 All au/iliary
continuously# 11.2.13 The
switches and au/iliary circuits shall "e capa"le of carrying a current of at least &- A BC
au/iliary switches shall "e capa"le of "reaking at least A in a - * BC circuit with a time constant of not less than - milliseconds#
The disconnectors and safety grounding switches shall have a mechanical key $pad locking key+ and electrical inter2locks to prevent closing of the grounding switches when isolator switches are in the closed position and to prevent closing of the disconnectors when the grounding switch is in the closed position# 11.2.1&
The local control of the Isolator and high2speed grounding switches from the "ay module control panel should "e achieved from the individual control switches with the remote9local transfer switch set to local# 11.2.1(
11.2.1+ All electrical se0uence interlocks will apply in "oth remote and local control modes#
Each disconnector shall have a clearly identifia"le local, positively driven mechanical position indicator, together with position indicator on the "ay module control ca"inet and provisions for taking the signals to the control room# The details of the inscriptions and colouring for the indicator are given as under) 11.2.1,
SIGN
$**7R
*%en %osition
pen
.reen
$losed %osition
Closed
3ed
All the disconnecting switches shall have arrangement allowing easy visual inspection of the travel of the switch contacts in "oth open and close positions, from the outside of the enclosure# 11.2.1
11.2.1 The
disconnecting switches shall "e provided with rating plates and shall "e accessi"le for inspection#
The disconnecting switches shall "e capa"le of "eing padlocked in "oth the open and closed positions with the operating motor automatically disengaged# The padlocking device shall "e suita"le for a standard si(e lock with a &- mm shank# The padlock must "e visi"le and directly lock the final output shaft of the operating mechanism# Integrally mounted lock when provided shall "e e0uipped with a uni0ue key for such three phase group# Faster key is not permitted# 11.2.20
12.0 Safety Groundin S6itches
Three2pole, group operated, safety grounding switches shall "e operated "y electric motor for use on - * BC ungrounded system and shall "e e0uipped with a manual operating mechanism for emergency use# The motor shall "e protected against over2current and short circuit# 12.1
Each safety grounding switch shall "e electrically interlocked with its associated disconnector and circuit "reaker such that it can only "e closed if "oth the current "reaker and disconnector are in open position# Safety grounding switch shall also "e mechanically key interlocked with its associated disconnector# 12.2
Each safety grounding switch shall have clearly identifia"le local positive driven mechanical indicator together with position indicator on the "ay module control ca"inet and provision for taking the signal to Control room# 12.3
12.&
The details of the inscription and colouring for the indicator are given as under
SIGN
$**7R
*%en %osition
pen
.reen
$losed %osition
Closed
3ed
Interlocks shall "e provided so that manual operation of the switches or insertion of the manual operating device will disa"le the electrical control circuits# 12.(
Each ground switch shall "e fitted with au/iliary switches having si/ normally open and si/ normally closed contacts for use "y others over and a"ove those re0uired for local interlocking and position indication purposes# 12.+
Provision shall "e made for padlocking the ground switches in either the open or closed position# 12.,
All portions of the grounding switch and operating mechanism re0uired for grounding shall "e connected together utili(ing fle/i"le copper conductors having a minimum cross2sectional area of 4- s0# mm# 12.
The main grounding connections on each grounding switch shall "e rated to carry the full short circuit rating of the switch for & sec# and shall "e e0uipped with a silver2 plated terminal connector suita"le for steel strap of ade0uate rating for connection to the grounding grid# 12.
12.10
The safety grounding switches shall conform to the re0uirements of IEC2 !<&2 &-
Fechanical position indication shall "e provided locally at each switch and remotely at each "ay module control ca"inet9 su"station automation system# 12.11
The rated Induced Current and *oltage for earth switches for "oth electrostatic and electromagnetic coupling shall "e as per IEC !<&2&-# 12.12
13.0 ;ih S%eed )ake Proof Groundin S6itches
.rounding switches located at the "eginning of the feeder "ay modules shall "e of the high speed make proof type and will "e used to discharge the respective charging currents, in addition to their safety grounding function# These grounding switches shall "e capa"le of interrupting the inductive currents and to withstand the associated T3*# 13.1
13.2
BC# 13.3
Single phase switches shall "e provided with operating mechanism suita"le for operation from a -* The switches shall "e fitted with a stored energy closing system to provide fault making capacity#
The short circuit making current rating of each ground switch shall "e at least e0ual to its peak withstand current rating# The switches shall have inductive9 capacitive current switching capacity as per IEC2 !<&2&-# 13.&
Each high speed make proof grounding switch shall have clearly identifia"le local positive driven mechanical indicator together with position indicator on the "ay module control ca"inet and provision for taking the signal Control 3oom# 13.(
13.+ The details of the inscription and colouring for the indicator shall "e as under)2 SIGN *P'N P*SITI*N $*S' P*SITI*N
$**7R
pen Closed
.reen 3ed
5igh speed ground switch operation should "e possi"le locally from the "ay module control ca"inet, or remotely from the control room in con1unction with opening of the associated disconnector# 13.,
These high speed grounding switches shall "e electrically interlocked with their associated circuit "reakers and disconnectors so that the grounding switches can not "e closed if the circuit "reakers and disconnectors are closed# 13.
Interlocks shall "e provided so that the insertion of the manual operating devices will disa"le the electrical control circuits# 13.
Each high speed ground switch shall "e fitted with au/iliary switches having si/ G si/ C au/iliary contacts for use "y others, over and a"ove these re0uired for local interlocking and position indication# All contacts shall "e wired to terminal "locks in the local "ay control ca"inet# Provision shall "e made for padlocking the ground switches in their open or closed position# 13.10
All portion of the grounding switches and operating mechanism re0uired for connection to ground shall "e connected together utili(ing copper conductor having minimum cross2sectional area of 4- s0# mm# 13.11
The main grounding connection on each grounding switch shall "e rated to carry the short time withstand current rating of the switch for & sec# and shall "e e0uipped with a silver plated terminal connector suita"le for steel strap of ade0uate design for connection to the grounding grid# 13.12
13.13
The high speed make proof grounding switches shall confirm to the re0uirements of IEC2!<&2&-#
The rated Induced Current and *oltage for earth switches for "oth electrostatic and electromagnetic coupling shall "e as per IEC !<&2&-# 13.1&
1&.0 Instrument Transformers 1&.1 $urrent Transformers !9 General4
i+The current transformers and accessories shall conform to IEC) !--''2& and other relevant standards e/cept to the e/tent e/plicitly modified in the specification# ii+ The particulars of the various cores may change within reasona"le limits as per the re0uirements of protection relay supplier# The manufacturer is re0uired to have these values confirmed from the purchaser "efore proceeding with design of the cores# The other characteristics of CTs shall "e as given in TEC5ICA8 PA3AFETE3 of Current Transformer# #9 Ratios and $haracteristics
The num"er, rating, ratios, accuracy class, etc# for the individual current transformers secondary cores shall "e in accordance with Ta"le2IA of S8B# here multi2ratio current transformers are re0uired the various ratios shall "e o"tained "y changing the effective num"er of turns on the secondary winding# $9 Ratin and iaram Plates
3ating and diagram plates shall "e as specified in the IEC specification incorporating the year of manufacture# The rated e/tended current rating voltage and rated thermal current shall also "e marked on the name plate# The diagram plates shall show the terminal markings and the relative physical arrangement of the current transformer cores with respect to the primary terminals $P& G P+# The position of each primary terminal in the current transformer S! gas section shall "e clearly marked "y two plates fi/ed to the enclosure at each end of the current transformer#
9 $onstructional etails4
a+ The current transformers incorporated into the .IS will "e used for protective relaying and metering and shall "e of metal enclosed type# The secondary windings shall "e air insulated9.as insulated with terminals "rought out for secondary connection# All the current transformers shall have effective electromagnetic shields to protect against high fre0uency transients# "+ Each current transformer shall "e e0uipped with a marshalling "o/ with terminals for the secondary circuits, which are connected to the local control cu"icle# The star9 delta configuration and the inter connection to the line protection panels will "e done at the CT terminal "lock located in the local control cu"icle# c+ Current transformers guaranteed "urdens and accuracy class are to "e intended as simultaneous for all cores# d+ The rated e/tended primary current shall "e &4-; at all ratios# e+ The instrument security factor at all ratios shall "e less than five $4+ for metering core# IS shall "e verified without use of any au/iliary reactor# f+ The wiring diagram, for the interconnections of the three single phase CTs shall "e provided inside the marshalling "o/# g+ The current transformers shall "e suita"le for high speed auto2reclosing# h+ Provisions shall "e made for primary in1ection testing either within CT or outside# i+ Electromagnetic shields to "e provided against high fre0uency transients typically &2%- F5(# 1+ The "idder will take care for the compati"ility of the CT vis2O2vis "urden of relay and connecting leads, however for calculation purpose fault current may "e taken as '-kA for -k*# 1&.2 Voltae Transformers !9 General
The voltage transformers shall conform to IEC2 !--''2 and other relevant standards e/cept to the e/tent e/plicitly modified in the specification# *oltage transformers shall "e of the electromagnetic type with S! gas insulation# The earth end of the high voltage winding and the ends of the secondary winding shall "e "rought out in the terminal "o/# #9 Ratios and $haracteristics
The rating, ratio, accuracy class, connection etc# for the voltage transformers shall "e in accordance with Ta"le II2A# $9 Ratin and diaram %lates
3ating and diagram plate shall "e provided complying with the re0uirements of the IEC specification incorporating the year of manufacture and including turns ratio, voltage ratio, "urden, connection diagram etc# 9 Secondary Terminals< 'arthin and 8uses
The "eginning and end of each secondary winding shall "e wired to suita"le terminals accommodated in a terminal "o/ mounted directly on the voltage transformer section of the S! switchgear#
All terminals shall "e stamped or otherwise marked to correspond with the marking on the diagram plate# Provision shall "e made for earthing of the secondary windings inside the terminal "o/# '9 The
transformer shall "e a"le to sustain full line to line voltage without saturation of transformer#
The accuracy class will "e at ma/imum tap# 89 $onstructional etails of Voltae Transformers4
a+ The voltage transformers shall "e located in a separate "ay module on the "us and will "e connected phase to ground and shall "e used for protection, metering and synchroni(ation# "+ The voltage transformers shall "e of inductive type, nonresistant and shall "e contained in their own2S! compartment, separated from other parts of installation# The voltage transformers shall "e effectively shielded against high fre0uency electromagnetic transients# The voltage transformers shall have three secondary windings c+ *oltage transformers secondary shall "e protected "y 53C cartridge type fuses for all the windings# In addition fuses shall "e provided for the protection and metering windings for fuse monitoring scheme# The secondary terminals of the *Ts shall "e terminated to the stud type non2disconnecting terminal "locks in the secondary "o/es via the fuse# d+ The voltage transformer should "e thermally and dielectrically safe when the secondary terminals are loaded with the guaranteed thermal "urdens# e+ The accuracy of -# on secondary III should "e maintained through out the entire "urden range upto &--*A on all the three windings without any ad1ustments during operation# f+ The diagram for the interconnection of the *Ts shall "e provided inside the marshalling "o/# 1&.3 Tests
Current and voltage transformers shall conform to type tests and shall "e su"1ected to routine test in accordance with IEC# 1&.& Technical Parameters4 1&.&.1 $urrent Transformers S. No.
a+ "+ c+ d+ e+ f+
g+ h+ i+
Particulars
3ated voltage Kn 3ated fre0uency System neutral earthing 3ated short time thermal current 3ated dynamic current 3ated insulation levels i+^- micro second impulse voltage ii+& Finute power fre0uency withstand voltage ne minute power fre0uency withstand voltage "etween secondary terminal G earth Fa/imum temperature rise over an am"ient temperature of '--C 3adio interference voltage at &#&
220kV
'4k* $rms+ 4- 5( Effectively earthed '- kA for & second &-- kAp :&-4- k*p '!- k* $rms+ 4k* $rms+ As per IEC !--''2& &--- microvolts
1+
Kn9L% and fre0uency range -#4 to F5( Partial discharge level
1&.&.2 Voltae Transformers Sl.No.
a+ "+ c+ d+ e+
f+ g+
&- pico coulom"
Particulars
3ated system voltage $Kn+ 3ated fre0uency System neutral earthing System fault level 3ated insulation levels i+^- micro second impulse voltage# ii+& Finute powerfre0uencywithstand voltage# ne minute power fre0uency withstand voltage for secondary 3adio interference voltage at &#& Kn9L% and fre0uency range -#4 to F5( 3ated total thermal "urden Partial discharge level
220kV
'4 k*$rms+ 4- 5( Effectively earthed '- kA for & second :&-4- k*p '!- k* $rms+ % k* $rms+ &--- microvolts '--*A &-Pico coulom"
1(.0 *utdoor #ushins !9 General
utdoor "ushings, for the connection of conventional e/ternal conductors9Aluminum tu"es to the S! metal enclosed switchgear, shall "e provided where specified and shall conform to the re0uirements given in specification# The dimensional and clearance re0uirements for the metal enclosure will "e the responsi"ility of the manufacturer and their dimensions must "e coordinated with the switchgear# 7ushings shall generally "e in accordance with the re0uirements of IEC pu"lication &%< as applica"le# #9 Insulation le-els and cree%ae distances
All "ushings shall have an impulse and power fre0uency withstand level that is greater than or e0ual to the levels specified for .IS# The creepage distance over the e/ternal surface of outdoor "ushings shall not "e less than 4 mm9k*# $9 #ushin ty%es and fittin
Condenser type "ushings will "e preferred "ut alternative types can also "e considered# 8i0uid filled "ushings shall "e provided with li0uid level gauges clearly visi"le from ground level, prefera"ly o the direct reading prismatic type or the magnetic type# ther types of li0uid level gauges will only "e accepted if specifically approved# 9 )echanical forces on "ushin terminals
utdoor "ushings must "e capa"le of withstanding cantilever forces due to weight of conductor9Aluminum tu"e , wind force and short circuit forces etc# Besign calculations in support of the cantilever strength chosen shall "e su"mitted for Employers review and approval# 1+.0 Sure !rrestors
The surge arrestors shall confirm in general to latest IEC M!-->>2'# 1+.1 Insulation $o5ordination and Selection of Sure !rrestor
The contractor shall "e fully responsi"le for complete insulation co2ordination of transformer yard including .IS# Contractor shall carry out detailed studies and design calculations to evolve the re0uired parameters locations, energy capa"ility etc# of surge arrestors such that ade0uate protective margin is availa"le "etween peak impulse, surge and power fre0uency discharge voltages and 7I8 of the protected re0uirement# If distance "etween Surge Arrestor and transformer "ushing terminal inclusive of head length is more than !- m or &<- ft then one surge arrestor shall "e with .IS System and another shall "e with transformer# The contractor shall perform all necessary studies# The report shall detail the limits of all e0uipment parameters which could affect the insulation coordination the report shall also detail the characteristics of the surge arrestor and shall demonstrate that the selected insulators protective and withstand levels, discharge and coordinating currents, and arrestor ratings comply with the re0uirement of this specification# The contractor shall also consider in the studies the open circuit "reaker condition, fast transients generated "y slow operation of disconnecting switches# The study report and design calculations shall "e su"mitted for approval of the purchaser# 1+.2 uty Reuirements
a+ The surge arrester shall "e S! filled, heavy duty station class and gapless $Fetal o/ide+ type without any series or shunt gaps# "+ The surge arresters shall "e capa"le of discharging over2voltages occurring during switching of unloaded transformers and long lines# c+ '4 k* class arrester shall "e capa"le of discharging energy e0uivalent to class % of IEC for '4 k* system on two successive operations# d+ The reference current of the arresters shall "e high enough to eliminate the Iinfluence of grading and stray capacitance on the measured reference voltage# e+ The surge arresters are "eing provided to protect the followings whose insulation levels are indicated in the ta"le given "elow)2 'ui%ment to "e %rotected
Power Transformer Instrument Transformer 3eactor C79Isolator Phase to ground Across open contacts
ihtnin im%ulse :kV%9 8or 2&( kV system
: >4: &-42 : &-4: &--
1+.3 $onstructional 8eatures
The nonlinear "locks shall "e of sintered metal o/ide material# These shall "e provided in such a way as to o"tain ro"ust construction, with e/cellent mechanical and electrical properties even after repeated operations# The arrestor enclosure shall "e vertically or hori(ontally mounted to suit the layout of the switchgear as suggested "y the manufacturer and shall "e fitted with a discharge counter located in an easily accessi"le position# The main grounding connection from the surge arrestor to the earth shall "e provided "y the "idder# The si(e of the connecting conductor shall "e such that all the energy is dissipated to the ground without getting overheated# 1+.& 8ittins and !ccessories for outdoor S!
a+ Self contained discharge counters, suita"ly enclosed and re0uiring no au/iliary or "attery supply for operation shall "e provided for each single pole unit# Suita"le leakage current meters should also "e supplied within the same enclosure# The reading of milli ammeter and counters shall "e visi"le through an inspection glass panel# "+ Ficroprocessor "ased instrument for monitoring resistive current or watt loss of the arrester shall also "e provided# 1+.( Tests
In accordance with the re0uirements stipulated the surge arrestors shall conform to type tests and shall "e su"1ected to routine and acceptance tests in accordance with IEC document# Each metal o/ide "lock shall "e tested for the guaranteed specific energy capa"ility in addition to the routine9acceptance test as per IEC2!-->># Test on Sure )onitors4
The Surge monitors shall also "e connected in series with the test specimens during residual voltage and current impulse withstands tests to verify efficacy of the same# Additional routine9functional tests with one &--A and &- kA current impulse, $=9- micro sec#+ shall also "e performed on the surge monitor# 1+.+ Parameters
ollowing are the parameters generally adopted "y Employer for their installations# These parameters are indicative and not "inding# The actual parameters re0uired for the installation shall "e evolved "y contractor# Sure !rrestor
Sl# o# a+ "+ c+ e+ f+ g+
h+
Particulars 3ated system voltage System neutral earthing 3ated arrestor voltage ominal discharge current 3ated fre0uency Finimum discharge capa"ility voltage corresponding to minimum discharge characteristics Continuous operating voltage at
-k* '4 k* Effectively earthed &!k* &- kA of =9- micro second wave 4- 5( 4 @9k* $referred to rated arrestor+ &!= k*
i+ 1+ k+ l+ m+ n+ o+ p+ 0+ r+ s+ t+ u+ v+
C Fin# switching surge residual voltage $& kA+ Fa/# switching surge residual voltage $& kA Fa/# residual voltage at i+ 4 kA ii+ &- kA nominal discharge current iii+ - kA nominal discharge current 8ong duration discharge class 5igh current short duration test value $'9&- micro second wave+ Current for pressure relief test Prospective symmetrical fault current Pressure relief class) 3I* at &#& Kn9L% k* rms$micro volts+ Partial discharge at &#-4 C* 3eference am"ient temp# Steep current impulse voltage
4-- k*p 4!- k*p !-- k*p
% &-- kAp '- kA rms '- kA rms for -#Sec A 8ess than 4-ot more than 4-pC C !4-k*p
1,.0 220=V GIS #uildin
7uildings shall house - @* .as Insulated Switchgear $.IS+ separately and other associated e0uipments inside in each of the .IS "uilding# "+ The "idder shall su"mit the design G construction proposal of the "uilding along with necessary information, data, and drawings in the techno2 commercial "id according to the complete re0uirements# c+ The plot plan of floor for - @* .IS "uilding is enclosed# The dimension given is for reference only and may vary according to re0uirement of the e0uipment to "e installed inside# The "idder shall finali(e the dimensions according to the e0uipment offered "y them providing enough space G access for erection, operation and maintenance# a!
1.0 Seismic esin $riteria4
The e0uipment shall "e designed for operation in seismic (one for earth0uake resistance# The seismic loads are due to the hori(ontal and vertical acceleration which may "e assumed to act non concurrently# Seismic level 6one2 I*, as per new IS2 &=>%, ?ear2-- has to "e considered for the design of e0uipment# The seismic loads shall "e e0ual to static loads corresponding to the weight of the parts multiplied "y the acceleration# The e0uipments along with its parts shall "e strong enough and sufficiently well connected to resist total operating stresses resulting from the forces in normal operation "ut in case of a"normal condition shall also resist with forces superimposed due to earth0uakes# The copies of type test reports for similar rated e0uipment, if tested earlier, should "e furnished along with the tender# If the e0uipment has not "een type tested earlier, design calculations of simulated parameters should "e furnished along with the offer# To prevent the movement of .IS su" assem"lies i#e# various "ay modules during the earth0uake, suita"le devices shall "e provided for fi/ing the su" assem"lies to the foundation# The contractor shall supply necessary "olts for em"edding in the concrete foundation# The fi/ing of .IS su" assem"lies to the foundation shall "e designed to with2stand the seismic events# It will also "e ensured that the special devices as well as
"olts shall not "e over stressed# The details of the devices used and the calculations for esta"lishing the ade0uacy shall "e furnished "y the supplier and shall "e su"1ect to the purchases approval# 1.0 Partial ischare )onitorin System / e6 Point )eter
Static Contact 3esistance Feter and Bynamic Contact 3esistance Feter, C7 operational Analy(er, S! .as Betector Feter, Porta"le P#B meter G Bew point meter shall "e offered # The specifications are enclosed at Section2 Special E0uipment# 20.0 >uality of S8+ Gas
a+ The S! gas insulated metal2clad switchgear shall "e designed for use with S! gas complying with the recommendations of IEC %
Identification of the contents of industrial gas cylinders#
IS) <%&& Seamless high car"on steel cylinders for permanent G high pressure li0uefia"le gases# The cylinders shall also meet Indian 7oilers 3egulations# $Fandatory+ c+ Test S! gas shall "e tested for purity, dew point, air, hydrolysa"le fluorides and water contents as per IEC)%
Bial type temperature compensated gas density or density monitoring devices with associated pressure gauge will "e provided# The devices shall provide continuous G automatic monitoring of the state of the gas G a separate device shall "e provided for each gas compartment so that each compartment can "e monitored simultaneously as follows)2 21.1
19 $om%artments e?ce%t circuit "reaker a9 Gas Refill le-el
This will "e used to annunciate the need for the gas refilling# The contractor shall provide a contact for remote indication# "9 @Aone Tri%@ le-el
This is the minimum level at which the manufacturer will guarantee the insulation rating of the assem"ly# Contacts shall "e in accordance with re0uirement# 29 $ircuit #reaker
$for -k* level+
a9 @Gas Refill@ le-el
This will "e used to annunciate the need for gas refilling# The contractor shall provide a contact for remote indication# "9
@#reaker #lock@ le-el
This is the minimum gas density at which the manufacturer will guarantee the rated fault interrupting capa"ility of the "reaker# At this level the "reaker "lock contact shall operate G the trip2ping G closing circuit shall "e "locked# c9 @Aone Tri%@ le-el
This is the minimum level at which the manufacturer will guarantee the insulation rating of the assem"ly# Contacts shall "e in accordance with re0uirement# The "idder should furnish temperature v9s pressure curves for each setting of density monitor along with details of the monitoring device# It shall "e possi"le to test all gas monitoring relays9devices without de2energi(ing the primary e0uipment G without reducing pressure in the main section# Plugs G sockets shall "e used for test purposes# It shall also damp the pressure pulsation while filling the gas in service, so that flickering of the pressure switch contacts does not take place# 21.2 a9 Gas eakae
The ma/imum gas leakage shall not e/ceed -#4; $half percent+ per year for the whole e0uipment and for any individual gas compartment separately# "9 Gas Su%%ly
The contractor shall include the supply of all S! gas necessary for filing G putting into operation the complete switchgear installation "eing supplied# In addition -; of total gas re0uirement shall "e supplied in separate cylinders as spare re0uirement, over G a"ove the re0uirement of gas for successful commissioning# Pl# refer list of mandatory spares in this connection# 22.0 Gas 8illin !nd '-acuatin Plant
All the plant necessary for filling and evacuating the S! gas in the switchgear shall "e supplied with the contract to ena"le any maintenance work to "e carried out# This shall include all the necessary gas cylinders for temporarily storing the evacuated S! gas# The capacity of the temporary storage facilities shall at least "e sufficient for storing the ma/imum 0uantity of gas that could "e removed when carrying out maintenance or repair work on the switchgear and associate e0uipment of at least one complete "ay# here any item of the filling and evacuating plant is of such a weight that it cannot easily "e carried "y maintenance personnel, it shall "e provided with lifting hooks for lifting and moving with the overhead cranes#
The capacity of the plant should "e such that it is capa"le of e/cavation9 filling of ma/imum 0uantity of gas contained in a compartment could "e removed9 filled within %- minutes while carrying out maintenance9 repair work# The evacuation e0uipment shall "e provided with all the necessary pipes, couplings, fle/i"le tu"es and valves for coupling up to the switchgear for filling or evacuating all the gases# The gas compartments shall prefera"ly "e fitted with permanent non2return valves through which the gas is pumped into or evacuated form the compartments# Betails of the filling and evacuating plant that will "e supplied, as well as the description of the filling and evacuating procedures shall "e provided along with the "id# 23.0 S8+ GIS to BP' $a"le Termination
The -k* underground ca"les are to "e connected to -k* .IS "y the interfacing of H8PE ca"le sealing end to .IS Ca"le termination enclosure for making connection %/%-- s0# H8PE ca"le# This interface section shall "e designed in a manner which will allow ease of operation and maintenance# The S! .IS to H8PE ca"le termination shall conform to IEC2=4> $latest edition+# The provision shall "e made for a remova"le link# The gap created when the link is removed should have sufficient electric strength to withstand the switchgear high voltage site tests# The "idder may suggest alternative arrangements to meet these re0uirements# The corona rings9stress shields for the control of electrical field in the vicinity of the isolation gap shall "e provided "y the .IS manufacturer# All supporting structures for the connections "etween the H8PE ca"le sealing ends and the .IS shall "e supplied "y the supplier# The supplier may specify alternative connecting G supporting arrangements for approval of the purchaser# The opening for access shall "e provided in each phase terminal enclosures as necessary to permit removal of connectors to isolate the H8PE ca"les to allow carrying out the insulation tests# The typical arrangement drawing of interconnecting ca"les from .IS "ay module to H8PE ca"le termination end shall "e su"mitted along with offer# 24.0
Electrc O!er"e#$ Cr#%e (I& #''lc#le)
"#$ %rane of suitable capacity shall be provided for erection & maintenance of of largest GIS componentassembly. $he crane shall consist of all special requirements for erection & maintenance of GIS equipments. $he crane shall be possible to be operated through the cable & through the pendant control' which shall be easily accessible from the floor of GIS building.
2(.0 Transformer Termination
The transformer Termination on %% @* side shall "e through &/&-- s0#mm H8PE ca"le and on -k* side through &-&#! 9B Aluminum Tu"ular conductor# 2+.0 Paintin *f 'nclosure
All enclosures shall "e painted e/ternally as per manufacturers painting procedure# The painting procedures as followed shall "e enclosed with the "id# 2,.0 ;eaters
herever re0uired, heaters shall "e provided to prevent moisture condensation# 5eaters are not allowed in side the main circuit# 2.0 Identification / Ratin Plate
i+ Each "ay shall have a nameplate showing a+ A listing of the "asic e0uipment from air entrance "ushing to air entrance "ushing $such as a "reaker, disconnectors grounding switches, current transformers, voltage transformers, and "ushings+# "+ A schematic diagram indicating their relative locations# c+ PE3.3IB Contract um"er# ii+ Each module will have its own Identification G rating plate# The rating plate marking for each individual e0uipment like circuit "reaker, disconnectors grounding switches, current transformer, voltage transformers, surge arrester etc shall "e as per their relevant IEC# TRANSPORT OF E*UIPMENT TO SITE.
$he contractor shall be responsible for the loading' transport' handling and offloading of all equipment and materials from the place of manufacture or supply to site. $he contractor shall be responsible to select and verify the route' mode of transportation and make all necessary arrangement with the appropriate authorities as well as determining any transport restrictions and regulations imposed by the government and other local authorities .ll transport packages containing critical units vi( %ircuit breakers' disconnectors' earthswitches' surge arrestors and bus sections e)ceeding * metres length shall be provided with sufficient number of electronic impact recorders + on returnable basis ! during transportation to measure the magnitude and duration of the impact in all three directions. $he acceptance criteria and limits of impact in all three directions which can be withstood by the equipment during transportation and handling shall be submitted by the contractor during detailed engineering. $he recording shall commence in the factory and must continue till the units reach site. $he data of electronic impact recorders shall be downloaded at site and a soft copy of it shall be handed over to "ngineer , in ,charge. -urther ' within three weeks the contractor shall communicate the interpretation of the data. PAC+ING, STORAGE AND UNPAC+ING.
ll the equipment shall be carefully packed for transport by sea' rail and road in such a manner that it is protected against the climatic conditions and the variations in such conditions that will be encountered enroute from the manufacturers works to the site. $he S-/ metalclad equipment shall be shipped in the largest factory assembled units that the transport and loading limitations and handling facilities on site will allow to reduce the erection and installation work on site to a minimum . 0here possible all items of equipment or factory assembled units shall be bo)ed in substantial crates or containers to facilitate handling in a safe and secure manner. Should the units be considered too large for packing in crates' they shall be suitably lagged and protected to prevent damage to any part' particularly small pro1ections' during transport and handling. Special lugs or protective supports shall be provided for lifting to prevent slings and other lifting equipment from causing damage. "ach crate' container or shipping unit shall be marked clearly on the outside to show where the weight is bearing and the correct position for the slings. "ach individual piece to be shipped' whether crate' container or large unit' shall be marked with a notation of the part or parts contained therein. Special precautions shall be taken to protect any parts containing electrical insulation against the ingress of moisture. $his applies particularly to the metalclad equipment of which each gas
section shall be sealed and pressuri(ed prior to shipping. "ither dry nitrogenair or dry S-/ gas shall be used and the pressure shall be such as to ensure that' allowing for reasonable leakage' it will always be greater than the atmospheric pressure for all variations in ambient temperature and the atmospheric pressure encountered during shipment to site and calculating the pressure to which the sections shall be filled to ensure positive pressure at all times during shipment. $he type of gas' the ma)imum pressure to which sections will be filled prior to shipment and the minimum allowable pressure during shipment shall be advised prior to dispatch. ll banking plates' caps' seals' etc.' necessary for sealing the gas sections during shipment to site shall be provided as part of the contract and shall remain the property of 2#0"3G3I4. If considered necessary' blanking plates or other sealing devices shall be provided with facilities for measuring the gas pressure and r echarging at any time during the transport period. ny seals' gaskets' 5# rings' etc. that may be used as part of the arrangement for sealing off gas sections for shipment of site' shall not be used in the final installation of the equipment at site. Identification serial numbers shall be stamped into the blanking plates' etc.' and on the switchgear equipment to which they are fitted so that they can easily be identified and refitted should it ever be necessary to ship sections of the switchgear back to the manufacturers works for repair. 6alves and other gas couplings associated with the switchgear gas systems shall be adequately protected against damage from any bumps or physical blows. $hey shall also be capped to prevent ingress of dirt or moisture or damage to any coupling' pipes' threads or special fittings. ny e)plosion vents and other pressure relief devices' shall be suitably sealed and protected to prevent accidental e)posure of the sealed sections during shipment to site. -or bus ducts involving male and female 1oints of the current carrying conductor ' the same shall be transported in disassembled condition to avoid any damage during transit. ll bright parts liable to rust shall receive a coat of anti rusting composition and shall be suitably protected. $he contractor will be able to use the available storage areas at site. $he contractor shall ensure that during the period between arrival at site and erection' all materials and parts of the contract works are suitably stored in such approved manner as to prevent damage by weather' corrosion' insects' vermin or fungoral growth. $he scope of providing the necessary protection' storing off the ground' as required etc. is included in the works to be performed by the contractor. $he equipment shall only be unpacked or removed from the containers immediately prior to being installed. $hey shall not be left lying unnecessarily in open crates or containers. Special precautions shall be taken when gas sections which have been sealed and pressuri(ed for shipping are opened up to reduce the ingress of dirt and atmospheric moisture to a minimum. 0henever possible this shall only be done immediately prior to installation and if any section is to be left outside for any length of time after being opened' it shall be resealed and pressuri(ed with either dry nitrogenair or S-/ gas until required.
A%%e- AI
Tec"%c#l S'ec&c#t/% &/r De P/%t Meter
$he meter shall be capable of measuring the due point of S-/ Gas of the %ircuit 7reaker GIS equipment. It should be portable and adequately protected for outdoor use. $he meter shall be provided with due point hygrometer with digital indication to display the due point temperature in degree %.' degree - or 228. It should be capable of measuring the corresponding pressure at which due point is being measured. $he measurement and use of the instrument must be simple' direct without the use of any other material chemical like dry ice acetone etc. It should be battery operated with rechargeable batteries. It should be suitable for operation on 99 6olts % mains supply. $echnical specification: ;. 8easuring range :
degree % 4ew 2oint. 9. ccuracy: ? 9 degree c. *. 4isplay: @ digit L%4' .> inch. Aigh.
TECHNICAL SPECIFICATION FOR PORTA1LE PD MONITORING SSTEM FOR GAS INSULATED SWITCHGEAR
3.0
GENERAL
$he equipment shall be used for detecting different types of defects in Gas Insulated Stations+GIS! such as 2articles' Loose shields and 2artial 4ischarges as well as for detection of 2artial discharges in other types of equipment such as %able Boints' %$s and 2$s. ;.; It shall be capable for measuring 24 in charged GIS environment as "A6 which shall have bandwidth in order of ; CA( , > CA( with possibility to select a wide range of intermediate bandwidths for best measurement results. $he principal of operation shall be on acoustic technique and the method of measurement shall be non=intrusive. $he instrument is able to detect partial discharges in cable 1oints' terminations' %$s and 2$s etc.' with the hot sticks. ;.9 4etection and measurement of 24 and bouncing particles shall be displayed on built in large L%4 display and the measurement shall be stored in the instrument and further downloadable to a 2% for further analysis to locate actual source of 24 such as free conducting particles' floating components' voids in spacers' particle on spacer surfaces etc.
2.0 TECHNICAL SPECIFICATION
8easurement shall be possible in noisy environment. Stable reading shall be possible in presence of vibrations within comple) GIS assemblies' which can produce signals similar to 24. "quipment should have necessary synchroni(ing circuits to obtain 24 correlation with power cycle and power frequency. $he equipment shall be battery operated with built=in=battery charger. It shall also be suitable for 9*6 %> A( input. 8easurement shall be possible in the charged switchyard in the presence of "8I"8%. Supplier should have supplied similar detector for GIS application to other utilities. 2erformance certificate and the list of users shall be supplied along with the offer. Instrument shall be supplied with standard accessories i.e.' re=locatable sensors with mounting arrangements' connecting cables +duly screened! to sensors' Lap=top 2%' diagnostic software' carrying case' rechargeable battery pack with charger suitable for 9*6 %' >A( supply connecting cables +duly screened! to view in storage. $he function of software shall be covering the following: = = = = = =
4ata recording' storage and retrieval in computer 4ata base analysis $emplate analysis for easy location of fault inside the GIS "valuation of 24 measurement i.e' mplitude' 2hase Synchroni(ation etc. "valuation of bouncingloose particles with flight time and estimation on si(e of particle. 3eport generation
$o prove the suitability in charged switchyard condition' practical demonstration shall be conducted before acceptance. Supplier shall have Ddequate after sales serviceE facility in India. Fecessary training may be accorded to personnel to make use of the kit for locating 24 sources inside the GIS Instrument shall be robust and conform to relevant standard.
T!#'5I R'>7IR')'NTS 8*R 2&( kV $7RR'NT TR!NS8*R)'R
No. of cores
$or !%%licati e on No.
$urre5 nt ratio
4
&
7KS BI C5EC@
% '
4
N*T'45
R
)in. =nee %t. Volta e Vk
)a?. $T Sec. Cd. Resistan ce :ohm9
)a?. '?cit5 ation $urrent Vk : in m!9
&!--2 =--9&
&!--9 =--
=9'
7KS BI FAI
&!--2 =--9&
&!--9 =--
=9'
FETE32 I. T3AS 7AC@ KP98IE P3T T3AS BI9 8IE P3T
&!--2 =--9& &!--2 =--9&
2
2
4 on &!--9& tap#4- on =--9& tap 4 on &!--9& tap#4- on =--9& tap 2
&!--9 =--
=9'
&!--9 =--
=9'
&!--2 =--9&
*ut5 %ut #ur5 den :V!9
-
!ccur5 acy $lass as Per I'$4 &&51
-#
4 on &!--9& tap#4- on =--9& tap 4 on &!--9& tap#4- on =--9& tap
Rem5 arks
R The 7idder will ensure compati"ility of CT and numerical relay in respect of knee2point voltage as well as operating time of relay to avoid mal2functioning or damage to the numerical relay# T!#'5II R'>7IR')'NT *8 220kV V*T!G' TR!NS8*R)'RS Sl.
P!RTI$7!RS
220kV
& % '
3ated primary voltage Type o# of secondaries 3ated voltage factor
4
Phase angle error
'49L% k* Electromagnetic % &# continuous *%- seconds :- minutes
! <
3ated voltage $*+ Application
Sec I &&-9L% Protection
Sec II &&-9L% Protection
Sec III &&-9L% Fetering
= >
Accuracy utput "urden $*A+ $minimum+
%P 4-
%P 4-
-# 4-
2.0
*$7)'NTS< !T! R!CINGS !N 'NGIN''RING $*5*RIN!TI*N PR*$'7R'.
>#& .IS e0uipment shall "e fully integrated, engineered and designed to perform in accordance with the technical specification# All engineering and technical services re0uired ensuring a completely engineered .IS su"station shall "e provided in respect of mechanical, electrical, control G instrumentation, civil G structural works as per the scope# ># *endor shall furnish engineering data9drawings and manuals in accordance with the schedule of information as specified in Technical Specification and data sheets# The num"er of copies9prints9floppy discs9CB23Fs9manuals to "e furnished for various types of documents is given in Anne/ure2I of this Section# In addition to num"ers indicated, sets of each of drawings G & set CB9loppies shall also "e furnished# >#%
The documentation that shall "e provided "y the *endor is indicated in the various sections of specification# This documentation shall in general include $whichever applica"le for the package+ "ut not "e limited to the following as mentioned "elow#
>#'
Betailed Engineering Bocuments i+ .eneral layout ii+ 8ayouts, general arrangements, elevations and cross2sections drawings for all the e0uipment and facilities of the plant#
iii+ vi+ Technical data sheets for all "ought out and manufactured items# *endor shall use the technical specifications as a "ase for placement of orders on their su"2 vendors# vii+ Betailed design calculations for components, system,, wherever applica"le# viii+ /i+ Power supply single line diagram, "lock logics, control schematics, electrical schematics, etc# /ii+ Protection system diagrams and settings# /iii+ Ca"les schedules and interconnection diagrams# /iv+ Ca"le routing plan# /v+ Instrument schedule, measuring point list, I9 list, Interconnection G wiring diagram, functional write2ups, installation drawings for field mounted instruments, logic diagrams, control schematics, wiring and tu"ing diagrams of panels and enclosures etc# Brawings for open loop and close loop controls $"oth hardware and software+# Fotor list and valve schedule including type of actuator etc# /vi+ Alarm and annunciation9 Se0uence of Event $SE+ list and alarms G trip set points# /vii+ Se0uence and protection interlock schemes# /viii+ Type test reports# /i/+ Control system configuration diagrams and card circuit diagrams and maintenance details# //+ Betailed software manuals G source software listing# //i+ Betailed flow chart for digital control system# /ii+ Fimic diagram layout# //iii+ Civil drawings for architectural works, foundations and super2structural works, Civil calculation sheets including structural analysis and design along with output results# //vii+ unctional G guarantee test procedures and test reports# //viii+ Bocumentation in respect of Quality Assurance System as listed out elsewhere in this specification#
*endorJs while su"mitting the a"ove documents9 drawings for approval9 reference as the case may "e, shall mark on each copy of su"mission the reference letter along with the date vide which the su"missions are made# 4#4
Instruction Fanuals *endor shall su"mit to EPI, draft Instruction Fanuals for all the e0uipments and as well as for the complete system covered under the Contract within the time agreed upon "etween EPI and the *endor# The Instruction manuals shall contain full details re0uired for erection, commissioning, operation and maintenance of each e0uipment# The manual shall "e specifically compiled for this pro1ect# The Instruction Fanuals of plant 9 e0uipment 9 system shall comprise of the following) i+ Erection Fanuals The erection manuals shall "e su"mitted atleast three $%+ months prior to the commencement of erection activities of particular e0uipment9system# The erection manual should contain the following as a minimum# a+ Erection strategy# "+ Se0uence of erection# c+ Erection instructions# d+ Critical checks and permissi"le deviation9tolerances# e+ 8ist of tool, tackles, heavy e0uipments like cranes, do(ers, etc# f+ 7ill of Faterials g+ Procedure for erection# h+ .eneral safety procedures to followed during erection9installation# i+ Procedure for initial checking after erection# 1+ Procedure for testing and acceptance norms# k+ Procedure 9 Check list for pre2commissioning activities# l+ Procedure 9 Check list for commissioning of the system# m+ Safety precautions to "e followed in erection all e0uipments and electrical supply distri"ution during erection#
ii+ peration G Faintenance $ G F+ Fanuals# a+ The manual shall "e a two rim P*C "ound stiff sided "inder a"le to withstand
constant usage or where a thicker type is re0uired it shall have locking steel pins, the si(e of the manual shall not "e larger than international si(e A%# The cover shall "e printed with the Pro1ect ame, Services covered and *olume 9 7ook num"er each section of the manual shall "e divided "y a stiff divider of the same#
si(e as the holder# The dividers shall clearly state the section num"er and title# All written instructions within the manual not provided "y the manufacturers shall "e typewritten with a margin on the left hand side#
"+ The arrangement and contents of G F manuals shall "e as follows )
&+ Chapter & 2 Plant Bescription ) To contain the following sections specific to the e0uipment9system supplied
$a+ Bescription of operating principle of e0uipment 9 system with schematic drawing 9 layouts# $"+ unctional description of associated accessories 9 controls# Control interlock protection writeup# $c+ Integrated operation of the e0uipment alongwith the intended system# $The is to "e given "y the supplier of the Fain e0uipment "y taking into account the operating instruction given "y the associated suppliers+# $d+ E/ploded view of the main e0uipment, associated accessories and au/iliaries with description# Schematic drawing of the e0uipment alongwith its accessories and au/iliaries# $e+ Besign data against which the plant performance will "e compared# $f+ Faster list of e0uipments, Technical specification of the e0uipment9 system and approved data sheets# $g+ Identification system adopted for the various components, $it will "e of a simple process linked tagging system+# $h+ Faster list of drawings $as "uilt drawing 2 Brawings to "e enclosed in a separate volume+#
+ Chapter #- 2 Plant peration ) To contain the following sections specific to the e0uipment supplied
$a+ Protection logics provided for the e0uipment alongwith "rief philosophy "ehind the logic, Brawings etc# $"+ 8imiting values of all protection settings#
$c+ *arious settings of annunciation9interlocks provided# $d+ Startup and shut down procedure for e0uipment alongwith the associated systems in step mode# $e+ BoJs and BonJts related to operation of the e0uipment# $f+ Safety precautions to "e take during normal operation# Emergency instruction on total power failure condition9lu"rication failure9any other conditions# $g+ Parameters to "e monitored with normal value and limiting values# $h+ E0uipment isolating procedures# $i+ Trou"le shooting with causes and remedial measures# $1+ 3outine testing procedure to ascertain healthiness of the safety devices alongwith schedule of testing# $k+ 3outine perational Checks, 3ecommended 8ogs and 3ecords $l+ Change over schedule if more than one au/iliary for the same purpose is given# $m+ Preservation procedure on long shut down# $n+ System9plant commissioning procedure# %+ Chapter %#- 2 Plant Faintenance) To contain the following sections specific to the e0uipment supplied# $a+ E/ploded view of each of the e0uipments# Brawings alongwith "ill of materials including name, code no# G population# $"+ E/ploded view of the spare parts and critical components with dimensional drawings $In case of Electronic cards, the circuit diagram to "e given+ and spare parts catalogue for each e0uipment#
$c+ 8ist of Special T9 P re0uired for verhauling 9Trou"le shooting including special testing e0uipment re0uired for cali"ration etc# $d+ Stepwise dismantling and assem"ly procedure clearly specifying the tools to "e used, checks to "e made, records to "e maintained etc# Clearance to "e maintained etc# $e+ Preventive Faintenance schedules linked with running hours9calendar period alongwith checks to "e carried out# $f+ verhauling schedules linked with running hours9calendar period alonwith checks to "e done# $g+ 8ong term maintenance schedules $h+ Consuma"les list alongwith the estimated 0uantity re0uired during normal running and during maintenance like Preventive Faintenance and verhauling# $i+ 8ist of lu"ricants with their Indian e0uivalent, 8u"rication Schedule including charts showing lu"rication checking, testing and replacement procedure to "e carried daily, weekly, monthly G at longer intervals to ensure trou"le free operation and 0uantity re0uired for complete replacement## $1+ Tolerance for fitment of various components# $k+ Betails of su" vendors with their part no# in case of "ought out items# $l+ 8ist of spare parts with their Part o, total population, life e/pediency G their interchangea"ility with already supplied spares# $m+ 8ist of mandatory and recommended spare list along with manufacturing drawings, material specification G 0uality plan for fast moving consuma"le spares# $n+ 8ead time re0uired for ordering of spares from the e0uipment supplier, instructions for storage and preservation of spares# $o+ .eneral information on the e0uipment such as modification carried out in the e0uipment from its inception, e0uipment population in the country 9 foreign country and list of utilities where similar e0uipments have "een supplied# <#-%#-% After finali(ation and approval of the Employer, the G F Fanuals shall "e su"mitted as indicated in Anne/ure2I# The Contract shall not "e considered to "e completed for purposes of taking over until the final Instructions manuals $"oth erection and G F manuals have "een supplied to EPI 9 Employer# If after the commissioning and initial operation of the plant, the instruction manuals $Erection and 9or GF manuals+ re0uire modifications9additions9 changes, the same shall "e incorporated and the updated final instruction manuals shall "e su"mitted "y the *endor to the EPI9Employer for records and num"er of copies shall "e as
mentioned in Anne/ure2&# <#-%#-' Pro1ect Completion 3eport# *endor shall su"mit a Pro1ect Completion 3eport at the time of handing over the plant9e0uipment# <#-'#-- Engineering Bata 9 Brawings <#-'#-& All data9 information furnished "y *endor in the form of drawings9 documents9catalogues or in any other form for TPCs information9 interface and or review and approval are referred "y the general term drawings# <#-'#- All documents su"mitted "y the *endor for EPI9EmployerJs review shall "e in electronic form $soft copies+ along with the desired num"er of hard copies as per Anne/ure2I # The soft copies to "e supplied shall "e either in CBs, loppies or through direct transfer via E2mail, etc# depending upon the nature9volume9si(e of the document# The drawings su"mitted for approval shall "e in the Image form 9 Autocad drawing format 9 pdf format reada"le through Acro"at 3eader as mutually agreed to "etween *endor and EPI "efore award of Contract# All documents9te/t 9calculations etc
information shall "e in FS ffice application such as FS M 3B or FS2E/cel as the case may "e# <#-'#-% All drawings su"mitted "y the *endor including those su"mitted at the time of "id shall "e in sufficient detail indicating the type, si(e, arrangement, weight of each component for packing and shipment, the e/ternal connection, fi/ing arrangement re0uired, the dimensions re0uired for installation and interconnections with other e0uipments and materials, clearance and spaces re0uired "etween various portions of e0uipment and any other information specifically re0uested in the drawing schedules# <#-'#-' Each drawing su"mitted "y the *endor $including those of su"2vendors of *endor+ shall "ear a title "lock at the right hand "ottom corner with clear mention of the name of EPI G Employer, the system designation, the specifications title, the specification num"er, the name of the Pro1ect, drawing num"er and revisions# If standard catalogue pages are su"mitted the applica"le items shall "e indicated therein# All titles, noting, markings and writings on the drawing shall "e in English# All the dimensions should "e in metric units# A sample of UTIT8E 7lock shall "e furnished to the successful vendor# <#-'#-4 The drawings su"mitted "y the *endor $or their su"2vendors+ shall "ear Employers drawing num"er wherever availa"le in addition to *endors $their su"2vendors+ own drawing num"er# Employers drawing num"ering system shall "e made availa"le to the successful *endor so as to ena"le him to assign Employers drawing num"ers to the drawings to "e su"mitted "y him during the course of e/ecution of the Contract# <#-'#-! *endor shall also furnish a Faster Brawing 8ist which shall "e a comprehensive list of all drawings9 documents9 calculations envisaged to "e furnished "y him during the detailed engineering to EPI along with the schedule of su"mission of each drawing9document# Such list should clearly indicate the purpose of su"mission of these drawings i#e# 3 APP3*A8 or 3 I3FATI 8?# <#-'#-< The review of these drawings "y EPI9Employer will cover only general conformance of the data to the specifications and documents, interfaces with the e0uipment provided under specifications, e/ternal connections, and of the dimensions which might affect plant layout# This review "y EPI9Employer may not indicate a thorough review of all dimensions, 0uantities and details of the e0uipment, materials, any devices or items indicated or the accuracy of the information su"mitted# This review and9or approval "y the Employer shall not "e relieve the *endor of any of his responsi"ilities and lia"ilities under this Contract# <#-'#-= After the approval of the drawings, further work "y the *endor shall "e in strict accordance with these approved drawings and no deviation shall "e permitted without the written approval of EPI9Employer# <#-'#-> All manufacturing, fa"rication and e/ecution of work in connection with the e0uipment 9 system, prior to the approval of the drawings, shall "e at the *endors risk#
