NATIONAL TRANSMISSION AND DESPATCH COMPANY LTD
STANDARD STA NDARD OPERAT OPERATING ING PROCEDURES (SOP) FOR GRID SYSTEM OPERATION AND MAINTENANCE
1) GRID GR ID STATION STATION EQUIPMENT 2) PROTECTION P ROTECTION AND INSTRUMENTA INSTRUMENTATION TION 3) TRANSMISSION LINES
TECHNICAL SERVICES GROUP (TSG) LAHORE
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JUNE 2013
SOP (M)-TSG-001/R1
TABLE OF CONTENTS S! D#$%&'&" P*+# N"! N"! I",%&" 1 4 M*&#*%# ". G&, S$# 2 7 2.1 General 8 2.2 Schedule Maintenance 8 2.3 Non Schedule Maintenance 8 2.4 Preventive Maintenance Program 8 2.5 Insection ! 2." General #erms $sed in Maintenance %or& ! 3 'o( Planning 14 3.1 )escrition o* stes involved in 'o( Planning 15 4 'o( Sa*et+ ,-areness and Sa*et+ ode 1! 4.1 /asic Sa*et+ Guide 0ines 1! M*&# #*%# S% S%# #, ,# *, C# #%%$ ". G&, S*&" 5 22 E4&'# 5.1 Maintenance Schedule and chec&s o* #rans*ormers 23 5.2 Maintenance Schedule and chec&s o* ircuit /rea&ers 32 5.3 Maintenance Schedule and chec&s o* Isolators 38 5.4 Maintenance Schedule and chec&s o* .#s 42 5.5 Maintenance Schedule and chec&s o* P.#s 45 5." Maintenance Schedule and chec&s o* #s 48 5.7 Maintenance Schedule and chec&s o* Surge ,rresters 51 5.8 Maintenance Schedule and chec&s o* /us /ars 54 5.! Maintenance Schedule and chec&s o* Grounding S+stem 57 5.1 Maintenance Schedule and chec&s o* 11 /s " 5.11 Maintenance Schedule and chec&s o* ) /atteries "4 5.12 Maintenance Schedule and chec&s o* ) /atter+ hargers "7 5.13 Maintenance Sc Schedule an and ch chec&s o* o* ,uiliar+ Su Sul+ S+ S+stem 7 5.14 Maintenance Schedule and chec&s o* Shunt eactors 73 5.15 Maintenance Schedule and chec&s o* GIS 78 5.1" Maintenance Schedule and chec&s o* Po-er 6 ontrol a(les 84 5.17 Maintenance Schedule and chec&s o* Shunt aacitor /an&s 87 5.18 Maintenance Schedule and chec&s o* ire )etection 6 ire !
2
JUNE 2013
SOP (M)-TSG-001/R1
TABLE OF CONTENTS S! D#$%&'&" P*+# N"! N"! I",%&" 1 4 M*&#*%# ". G&, S$# 2 7 2.1 General 8 2.2 Schedule Maintenance 8 2.3 Non Schedule Maintenance 8 2.4 Preventive Maintenance Program 8 2.5 Insection ! 2." General #erms $sed in Maintenance %or& ! 3 'o( Planning 14 3.1 )escrition o* stes involved in 'o( Planning 15 4 'o( Sa*et+ ,-areness and Sa*et+ ode 1! 4.1 /asic Sa*et+ Guide 0ines 1! M*&# #*%# S% S%# #, ,# *, C# #%%$ ". G&, S*&" 5 22 E4&'# 5.1 Maintenance Schedule and chec&s o* #rans*ormers 23 5.2 Maintenance Schedule and chec&s o* ircuit /rea&ers 32 5.3 Maintenance Schedule and chec&s o* Isolators 38 5.4 Maintenance Schedule and chec&s o* .#s 42 5.5 Maintenance Schedule and chec&s o* P.#s 45 5." Maintenance Schedule and chec&s o* #s 48 5.7 Maintenance Schedule and chec&s o* Surge ,rresters 51 5.8 Maintenance Schedule and chec&s o* /us /ars 54 5.! Maintenance Schedule and chec&s o* Grounding S+stem 57 5.1 Maintenance Schedule and chec&s o* 11 /s " 5.11 Maintenance Schedule and chec&s o* ) /atteries "4 5.12 Maintenance Schedule and chec&s o* ) /atter+ hargers "7 5.13 Maintenance Sc Schedule an and ch chec&s o* o* ,uiliar+ Su Sul+ S+ S+stem 7 5.14 Maintenance Schedule and chec&s o* Shunt eactors 73 5.15 Maintenance Schedule and chec&s o* GIS 78 5.1" Maintenance Schedule and chec&s o* Po-er 6 ontrol a(les 84 5.17 Maintenance Schedule and chec&s o* Shunt aacitor /an&s 87 5.18 Maintenance Schedule and chec&s o* ire )etection 6 ire !
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5.1! 5.1! 5.2 5.2 5.21 5.21 " ".1 ".2 ".3 ".4 ".5 ".5 7 8 ! 1 1.1 1.2 1.3 1.4 1.5 1." 1.7 1.8 11 11.1 11.2 11.3 11.4 11.5
ighting 9uiment Main Mainte tena nanc ncee Sche Schedu dule le and chec chec&s &s *or -or& -or& suor suortt *acili *aciliti ties es at ontrol /uilding Main Mainte tena nanc ncee Sche Schedu dule le and chec chec&s &s *or -or& -or& suor suortt *acili *aciliti ties es at :utdoor S-itch ;ard ,rea Main Mainte tena nanc ncee Sched Schedul ulee and and chec chec&s &s *or living living suo suort rt *acili *aciliti ties es at esidential olon+ o* Grid Station M*& M*&# #* *% %## S% S%# #, ,# # *, *, C#% C#%$ $ ". P" P"#% #%&" &" *, I$#*&" (P5I) Maintenance Schedule and chec&s o* ontrol Panels Maintenance Sc Schedule an and ch chec&s o* o* Pr Protection e ela+ Pa Panels Maintenance Schedule and chec&s o* #ransmission 0ine Protection Maintenance Schedule and chec&s o* #rans*ormer Protection Main Mainte tena nanc ncee Sch Sched edul ulee and and chec chec&s &s o* Misc Miscel ella lane neou ouss Prot Protec ecti tion on ela+s M*&#*%# S%#,# *, C#%$ ". T*$&$$&" T*$&$$&" L&#$ T#%&%* D&#%&6# ." T*$&$$&" L&#$ R#.##%# D** ." I#'#*&" I #'#*&" ". T#$ T#$ R#$$ O'#*&" ". G&, S$# Introduction General Provisions NP S:P *or S+stem elia(ilit+ elia(ilit+ and securit+ securit+ NP ontingenc+ Plan Plan *or /lac& Start o* #ar(ela #ar(ela Po-er Po-er Station Parallel :eration o* #rans*ormers 0oading o* #rans*ormers Meas Me asur ures es to Mi Mini nimi mi
rs> Im Imorta rtant )e*initions and harac racteris ristics ?uantities ircuit /rea&ers> l las asse sess o* i irc rcui uitt /r /rea ea&e &ers rs@@ Imortant )e*initions@ :erating #ime and haracteristic ?uantities Proerties o* Insulating :il@ their Signi*icance and #est Methods AI "2!" B 23C #reatment o* :il
!2 !5 !" !8 1 12 14 15 17 1! 113 11" 151 152 153 15" 157 15! 1" 1"" 1"7 1"! 1"! 178 1!5 23 2!
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12 13
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213 214
1! INTRODUCTION
#o &ee &ee the electrical o-er s+stem in sa*e@ sta(le and relia(le oerating condition@ it is necessar+ that the s+stem should (e oerated and maintained roerl+ to retain r etain its each comonent in or restore it to a state in -hich it can er*orm a re9uired *unction. Maintenance has (ecome no-ada+s an imortant *actor due to man+ reasons. conomic and legal considerations are among the most signi*icant@ *or eamle etending the service li*e@ reducing li*e c+cle costs@ reducing do-ntimes@ sa*et+ asects and environmental rotection regulations. In addition to the urchase costs@ the ro*ita(ilit+ o* s-itchgear and control=gear in (oth the high and lo- voltage s+stems s+stems deends deends a(ove a(ove all on the calculated calculated oerating oerating costs *or the entire service li*e. #here*ore@ to meet -ith the current re9uirements o* u=gradations in the elec electr tro= o=te tech chni nica call tech techno nolo logi gies es@@ emer emergi ging ng mode modern rn tren trends ds o* oer oerat atio ion n and and maintenan maintenance@ ce@ technical technical standardsD standardsDseci seci*icat *ications ions and sa*et+ sa*et+ a-areness a-areness this needition o* Standard :erating Procedure AS:PC has (een comiled. #his (oo&let o* S:P covers all the oeration and maintenance re9uirements o* grid gr id s+stem o* GS: deartments o* N#) and )IS:S in all the three main *ields o* grid s+stem> = Grid Station 9uiment@ = Protection and Instrumentation@ = #ransmission 0ines.
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A 6 ". 220V $8&%*, ". 220V G/S NTDC N9LP L*"#
A 6 ". '"#%&" #* "" * 220V G/S N9LP L*"#
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A 6 ". 220V *$&$$&" &#$ ##&+ 220V G/S N9LP L*"#
#he scoe o* oeration and maintenance -or& relevant to the a(ove mentioned main *ields including the other allied -or&s have (een descri(ed in terms o* imlementation *re9uenc+ and schedules@ -or& activities@ testing@ etc. In simle -ords this S:P descri(es that -hat to do and -hen to do (ut *or ho- to do@ the -or& rocedures have (een descri(ed in s&ill enhancement training course (oo&s o* #SG training rogram. #he relevant re*erence data *or comarison and interretation o* di**erent oerating conditions and test results has also (een included in the (oo&let. Sa*et+ and health o* the -or&ers has a aramount imortance in imlementation o* the S:P. 0ac& o* Sa*et+ a-areness@ $n=sa*e acts and $n=sa*e -or&ing conditions@ etc. al-a+s result into accidents and damages either to the -or&ers or the e9uiment. It is essential that -hile on -or& each -or&er must *ollo- the sa*e -or&ing methods and rocedures as the li*e or loss he saved could ver+ -ell (e his o-n. #he sa*et+ instructions as er Po-er Sa*et+ odes o* N#) and )IS:s shall (e *ollo-ed (+ the each individual emlo+ee -hile on -or& at the coman+ remises. #he contents herein the (oo&let are in=line -ith the %,P),DPP: technical seci*ications@ N#) Grid ode@ I standards and the recommendations o* the manu*acturers dealing -ith the grid s+stem e9uiment and other hard-are. Eo-ever@ deviation to these instructions and guidelines is ermissi(le i* the more e**ective alternatives are imlemented.
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2! MAINTENANCE OF GRID SYSTEM
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2!1 GENERAL #he -ord Fmaintenance in encountered *re9uentl+@ though it is used -ith di**erent meanings. Its overall concet includes insections@ scheduled maintenance@ non= scheduled maintenance and corrective measures. ,s er I standard@ maintenance is the com(ination o* all technical and administrative actions@ including suervision actions@ intended to retain an item in@ or restore it to@ a state in -hich it can er*orm a re9uired *unction. #he roer maintenance also ensures correct oeration o* grid station e9uiment ermanentl+ over its design li*e@ even longer i* it is Husti*ied economicall+ and technicall+. Generall+ the maintenance -or& is categori
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2!:!1 MAINTENANCE INTERVALS Generall+ *ollo-ing are the three main criteria -hich determine the time eriod or intervals to carr+ out the reventive maintenance on grid s+stem e9uiment>
= #he recommended time and service eriod@ = #he num(er o* mechanical oerations@ = #he num(er o* short circuit current disconnections or the total num(er o* (rea&ing currents. It is a universal ractice that most o* the maintenance -or& is carried out on the criteria o* recommended time eriods o* service li*e o* the e9uiment Adail+@ -ee&l+@ monthl+@ 9uarterl+@ annuall+@ 5 to 1 +earl+@ 2 +earl+@ etc.C. #he time eriod are seci*ied on the (ases o* the recommendations o* the manu*acturers and the local eeriences. #he local eeriences include administrative rules 6 regulations@ service conditions@ the availa(le resources@ other in*luencing *actors@ etc. Maintenance@ on the criteria o* num(ers o* mechanical oerations or electrical s-itching oerations@ is carried out rarel+. %hether@ visual insections or scheduled or non=scheduled maintenance all contri(ute to a reventive maintenance rogram. 2!; INSPECTION isual insectionDinvestigation o* the rincial *eatures o* the s-itchgear 6 control=gear and other e9uiment in service (elonging to a s+stem is carried out@ -ithout dismantling@ to evaluate the actual status. #his investigation is generall+ directed to-ard ressures Aair@ gasesC and D or levels o* *luids Ainsulating oil@ lu(ricating oil@ h+draulic oilC@ tightness@ osition o* rela+s@ ollution o* insulating arts@ (ut actions such as lu(ricating@ cleaning@ -ashing etc. -hich can (e carried out -ith the s-itchgear and control=gear in service are also included. Insections are also descri(ed as -al& around visual insection *rom ground level &eeing in vie- the sa*e limits o* aroaches. Shutdo-n o* the e9uiment is not involved normall+. :n the (ases o* insection data@ short=term and long=term -or& rogram *or carr+ing out reventive maintenance are reared to meet -ith the (est ossi(le level o* oerational availa(ilit+ and relia(ilit+ o* the grids s+stem. 2!< GENERAL TERMS USED IN MAINTENANCE =OR9 O6#* %or& done -ith the o(Hective o* reairing or relacing arts -hich are *ound to (e out o* tolerance (+ insection@ tests@ eamination@ or as re9uired (+ manu*acturers maintenance manual@ in order to restore the comonent and D or the s-itchgear and control=gear to an acceta(le condition. :verhauling can (e categori
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overhauling and maHor overhauling deending uon the seci*ic instructions o* the manu*acturer and D or local eerience and olic+ o* the coman+. M&" O6#* Minor overhauling o* the e9uiment is a sort o* detailedDeanded visual insection *or -hich shutdo-n is normall+ involved. outine *unctional tests are er*ormed to assess the oerational condition and relia(ilit+ o* the e9uiment. )ismantling o* the e9uiment is normall+ not involved@ hence no need o* sare arts. #he time eriod o* one to t-o +ears o* service li*e is considered as normal *re9uenc+ *or minor overhauling. M*>" O6#* MaHor overhauling o* the e9uiment involves dismantling into su(=assem(lies and detailed eamination o* the comonent arts and measurements o* the -ear tear e**ects. elacement o* certain arts is essential such as tightness s+stem gas&ets@ :=rings etc. #he time eriod o* *ive to t-ent+ +ears o* service li*e is considered as normal *re9uenc+ *or maHor overhauling. Shutdo-n o* the e9uiment is an essential re9uirement. D&*+"$&% T#$$ #hese tests are comarative tests o* the characteristic arameters o* s-itchgear 6 control=gear and other e9uiment to veri*+ that the+ er*orm their *unctions@ (+ measuring one or more o* these arameters. Note. #he test results *rom diagnostic tests can lead to the decision to carr+ out overhaul. D"8 T&# #his is the time interval during -hich an item is in a do-n state Anot *unctioningC. E?*&*&" Insection -ith the addition o* artial dismantling@ as re9uired@ sulemented (+ means such as measurements and non=destructive tests in order to relia(l+ evaluate the condition o* the s-itchgear and control=gear. D#.#% ,n imer*ection in the state o* an item Aor inherent -ea&nessC -hich can result in one or more *ailures o* the item itsel*@ or o* another item under the seci*ic service or environmental or maintenance conditions@ *or a stated eriod o* time.
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F*&# #he termination o* the a(ilit+ o* an item to er*orm a re9uired *unction is called *ailure.
Note. 1 ,*ter F*ailure the item has a *ault. Note. 2 Failure is an event@ as distinguished *rom F*ault@ -hich is a state. Note. 3 #his concet o* F*ailure as de*ined does not al+ to items consisting o* so*t-are onl+. M&" F*&# (". $8&%+#* 5 %""-+#* *, "# #4&'#) ,n+ *ailure o* a constructional element or a su( assem(l+ -hich does not cause a maHor *ailure is re*erred as minor *ailure. M*>" F*&# (". $8&%+#* 5 %""-+#* *, "# #4&'#) ailure o* s-itchgear 6 control=gear and other e9uiment -hich causes the (loc&age o* one or more o* its *undamental *unctions is re*erred as maHor *ailure. , maHor *ailure -ill result in an immediate change in the s+stem oerating conditions@ e.g. the (ac&u rotective e9uiment -ill (e re9uired to remove the *ault@ or -ill result in mandator+ removal *rom service -ithin 3 minutes *or unscheduled maintenance. D&$'&6# D&$%*+# Phenomenon associated -ith the *ailure o* insulation under electric stress@ in -hich the discharge comletel+ (ridges the insulation under test@ reducing the voltage (et-een the electrodes to
Note.1 #his term alies to Fdischarges in solid@ li9uid and gaseous dielectrics and to com(inations o* these. Note. 2 , Fdisrutive discharge in a solid dielectric roduces ermanent loss o* dielectric strength Anon=sel*=restoring insulationCJ in a li9uid or gaseous dielectric@ the loss ma+ (e onl+ temorar+ Asel*=restoring insulationC. S'*-"6# , disrutive discharge -hich occurs in a gaseous or li9uid dielectric is re*erred as sar& over.
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F*$"6# , disrutive discharge -hich occurs over the sur*ace o* a solid dielectric in a gaseous or li9uid medium is re*erred as *lashover. P%# , disrutive discharge -hich occurs through a solid dielectric is re*erred as uncture. P*&* D&$%*+# (PD) 0ocali
Note. 1 KPartial discharge is in general a conse9uence o* local electrical stress concentrations in the insulation or on the sur*ace o* the insulation. Generall+@ such discharges aear as ulses having duration o* much less than one Ls. More continuous *orms can@ ho-ever@ occurs@ such as the so=called ulse=less discharges in gaseous dielectric. Note. 2 Korona is a *orm o* artial discharge that occurs in gaseous medium around conductors -hich are remote *rom solid or li9uid insulations. Forona should (e used as a general term *or all *orms o* P). C""* orona discharge is de*ined as a luminous discharge due to ioni
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and other eternal conditions such as ollution@ humidit+@ vermin@ etc. is re*erred as eternal insulation. I#* I$*&" #he internal solid@ li9uid or gaseous arts o* the insulation o* e9uiment@ -hich are rotected *rom the e**ects o* atmosheric and other eternal conditions is re*erred as internal insulation. S#.-#$"&+ I$*&" Insulation -hich comletel+ recovers its insulating roerties a*ter a disrutive discharge is re*erred as sel*=restoring insulation. N" S#.-#$"&+ I$*&" Insulation -hich loses its insulating roerties or does not recover them comletel+ a*ter a disrutive discharge is re*erred as non=sel*=restoring insulation. D#+## ". P"#%&" (IP C",#) , coding s+stem to indicate the degrees o* rotection rovided (+ an enclosure against access to ha
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3! JOB PLANNING 'o(s are eecuted more e**icientl+ and e**ectivel+ -hen the+ are lanned -ell and all concerned &no- -hat is eected. #he *ollo-ing stes and guidelines should (e considered *or lanning the routine maintenance Ho(s. #he emergenc+ maintenance Ho(s Asuch as trou(le shooting@ reairing@ etc.C are non=scheduled@ ho-ever@ the rocedureDstes *ollo-ed in lanning a scheduled -or& and the eerience gained thereo* is e9uall+ alica(le in handling emergencies. Secial attention should (e given to the sa*et+ re9uirements.
1C ollo- the aroved -or& rogram. 2C ,rrange the maintenance rocedures. 3C ,rrange e9uiment manual and dra-ings. 4C ,rrange revious maintenance records. 5C ,rrange the sare arts re9uired. "C ,rrange # 6 P and test e9uiment needed. 7C stimate and arrange to meet the eenditure involved. 8C stimate the num(er o* man hours and the length o* .time re9uired to comlete the Ho(. !C ,rrange to get co=ordination o* the other -or& grous A such as Grid maintenance@ P6I@ #D0@ etc.C i* needed. 1C ,rrange shut do-n o* the e9uiment to (e -or&ed on i* needed Are*er rocedure *or P#%C. 11C Insect Ho( site to loo& *or> 11.1C Ea
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3!1
DESCRIPTION OF THE STEPS INVOLVED IN JOB PLANNING
1C ollo- -or& rogram. ach grids maintenance cre- must have an aroved -or& rogram involving each e9uiment to (e maintained (+ the cre- in his -or& Hurisdiction. See +our -or& rogram *or the Ho( to do. 2C ,rrange maintenance rocedures. ach grid maintenance cre- is suosed to have an aroved ac&age o* maintenance rocedures regarding ever+ t+e o* maintenance -or& to (e done@ *or eamle regular maintenance@ minor overhauling and maHor overhauling rocedures. Such a set o* maintenance rocedures should also (e availa(le at central laces in GS: organi
o* sares and su(mit demands to the higher -ell in time so that -or& rogram ma+ not su**er due to non=availa(ilit+ o* sares. Get the sares re9uired. "C ,rrange *or #6P and test e9uiment needed. ach grid maintenance cre- is suosed to have a comlete ac&age o* routine used #6P and (asic test e9uiment Ae*er standard #6P list attachedC@ other-ise arrange to have the same. #he t+e and 9uantit+ o* #6P is determined (+ (rea&ing the Ho( into a num(er o* tas&s and the # 6 P re9uired *or each tas&. ach cre- ma+ not have all the test instruments and secial tools due to (eing costl+@ so one or t-o sets o* these test e9uiment and secial tools can (e arranged at circle level and (e used (+ all the cre-s in that circle -ith mutual co=ordination. , guideline *or this mutual co= ordination is that -or& rograms *or cre-s in a circle should (e reared in such a -a+ that their -or& activities timings not overla each other. ;ou -ill get the test e9uiment and secial tools re9uired *or the Ho( -ell (e*ore. 7C stimate and arrange to meet the eenditures involved. ollo-ing the N#) *inancial rules and rocedures@ the cre- in=charge should su(mit his (udget demands and get the re9uired (udget allocated *or the *inancial +ear. #he cre- ma+ needs (udget *or overtime -or& a+ments@ reair o* vehicles@ urchase o* cleaning and lu(ricating hard -ares@ medical (ills@ other ett+ urchase and reairs etc. ;ou -ill estimate and get the mone+ re9uired to meet the eenditures -ith the Ho( -ell (e*ore. 8C stimate num(er o* man=hours and the length o* time re9uired to comlete the Ho(. eeing in vie- the nature o* Ho( to (e done +ou -ill estimate the men re9uired *or the Ho( and *or ho- much hours the+ -ill need to comlete the Ho(. #his is done (+ (rea&ing the Ho( into a num(er o* tas&s. Eence@ +ou -ill estimate the total time re9uired *or the Ho( and the same -ill (e the e9uiment shut do-n time i* shut do-n is re9uired. !C ,rrange to get co=ordination o* the other -or& grous AP6I@ #D0@ etc.C i* needed. #o minimi
I* shut do-n o* the e9uiment to (e -or&ed on is re9uired@ +ou have calculated the duration o* shut do-n Are*er ste=8C@ al+ to the NPD *or shut do-n 72=hours (e*ore the shutdo-n start time. 11C Insect Ho( site to loo& *or> 11.1C Ea Ea 12.1C #o tell them -hat is the Ho( to do@ 12.2C #o discuss the ha
12.5C #o *inali = Identi*+ the ha
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JOB SAFETY A=ARENESS AND SAFETY CODE
;ou -ill get sa*et+ a-areness and *ollo- the rescri(ed sa*et+ rules and guidelines -hile on -or& *or +our o-n sa*et+@ o* *ello- -or&ers and o* the coman+s roert+. It is the resonsi(ilit+ o* the man=in=charge and o* each cre- mem(er to constantl+ (e on the loo&out *or sa*et+ ha
aC I)N#I; the Ea
and the e9uiment -ith -hich the+ -or&. )ue care and attention to all sa*et+ rules and devices is essential not onl+ to revent inHur+ to the -or&ers (ut also to rotect e9uiment. = aa(le and mentall+ alert emlo+ees -ill avoid accidents (+ learning all the+ can a(out their -or&@ using roer sa*eguards and rotective e9uiment and avoiding shortcuts and ma&e shi*t -or& methods. = Good oeration is sa*e oeration. #his is true *or (oth emlo+ees and e9uiment. , Ho( done sa*el+ is Ho( done e**icientl+. ,ccidents do not FHust haen. ,ccidents are the natural result o* unsa*e condition or unsa*e acts@ usuall+ a com(ination o* (oth. Machiner+ and e9uiment generall+ are manu*actured to er*orm sa*el+ -ithin limits o* design. In *act@ statistics sho- that more than !O o* accidents are due to the human element@ such as *ailure to use sa*et+ devices and o(serve sa*et+ rules and rocedures. UNSAFE CONDITIONS@ Some eamles o* unsa*e conditions -hich ma+ cause accidents are> I'"'# G*,&+ such as unshielded moving arts o* machine@ in=(arricaded *loor oenings and ecavation@ unenclosed high voltage e9uiment@ lac& o* rotective e9uiment and insu**icient -arning signs etc. D#.#%&6# M*#&* " #4&'# such as mushroomed=head chisels@ slit handles@ deteriorated oles@ oorl+ manu*actured or -ea& e9uiment. H**,"$ A*+##$ such as those due to oor house&eeing at -or& locations@ unsa*e lanning or inade9uate -or&ing sace. I$..&%&# L&+ unsuita(le location roducing glare or o(Hectiona(le shado-s. I'"'# V#&*&" such as insu**icient change o* air or resence o* harm*ul vaor@ dust or gas. U$*.# C"&+ that *its loosel+ and can (ecome entangled in -ires and machiner+@ and *ailure to use goggles@ roer shoes and insulated gloves or sleeves. U$*.# D#$&+ *, C"$%&" due to deviations *rom standard design and seci*ications and oor -or&manshi.
UNSAFE ACTS@ Some eamles o* unsa*e acts -hich ma+ cause accidents are> O'#*&+ =&" A"& " =*&+ such as closing s-itches -ithout authorit+@ oerating hoists and truc&s -ithout -arning@ *ailure to lace -arning signs or signal man -here needed@ *ailure to (loc& e9uiment against uneected movement@ *ailure to o(serve -or& clearance rocedures. O'#*&+ " ="&+ * U$*.# S'##, such as driving too *ast@ thro-ing material or tools to another -or&er@ Huming *rom vehicles or lat*orms or r unning. M*&+ S*.# D#6&%#$ I"'#*&6# such as removing guards *rom machines@ using oversi#%$ -here the+ are li&el+ to *all. M&?&+ I'"'# P*%&+ or com(ining chemicals to *orm a dangerous miture. T*&+ U$*.# P"$&&" " P"$# such as -or&ing on live conductors *rom a(ove instead o* (elo-@ -al&ing under susended loads or too close to oenings@ li*ting -hile in a-&-ard osition@ entering areas -here there are dangerous gases or *umes@ assing on curves o* hills@ riding on running (oards or other unsa*e laces on vehicles. ="&+ " E4&'# 8&" T*&+ P"'# P#%*&"$ such as installing and removing temorar+ earth@ cleaning@ oiling or adHusting moving machiner+@ and -or&ing on or near live electrical e9uiment. D&$*%&+ T#*$&+ " S*&+ such as ractical Ho&ing@ horsela+@ 9uarrelling or anno+ing. F*&# " U$# S*.# C"&+ " P"#%&6# E4&'# such as *ailure to use insulated gloves@ hardhat or goggles or other ersonal rotective e9uiment APPC.
;! MAINTENANCE EQUIPMENT
SCHEDULE
AND
CHEC9S
GRID
STATION
Preventive maintenance is a c+cle o* lanned insections@ -or& activities and tests to (e imlemented to get and ensure sa*e and relia(le er*ormance o* e9uiment and in*rastructure comonents o* the grid s+stem. #he maintenance c+cle or *re9uenc+ o* imlementation is given in terms o* time=eriods@ -hich can (e modi*ied due to environmental conditions and constraints o* the man=hours and 9uantit+ o* the e9uiment under the Hurisdiction o* the -or& cre-. #he chec& sheets given hereunder descri(e onl+ the maintenance schedules and chec&sDtests in terms o* -hat to do and -hen to do. or the asect o* ho- to do@ one should consult relevant manu*acturers instruction manual@ #SG training course (oo&s andDor #SG technical eerts. In addition to the insection and maintenance activities given in this S:P@ manu*acturers recommended instructions are also alica(le. #he s+m(ols used *or time=eriods *or insection and maintenanceD*re9uenc+ o* imlementation are as under> D stands *or dail+@ = stands *or -ee&l+@ M stands *or monthl+@ Y stands *or +earl+.
1! MAINTENANCE OF PO=ER TRANSFORMERS
2;0MVA 220/1329V A" T*$."# * 220V G/S N9LP L*"#
SOP CHEC9 SHEET@ MAINTENANCE SCHEDULE AND CHEC9S/TESTS OF PO=ER TRANSFORMERS D#$%&'&" ". I$'#%&" *, M*&#*%# =" 1. isual insection A, -al& around visual insection *rom ground level and &eeing in vie- the sa*e limits o* aroach to live and moving arts to chec& aarent condition@ a(normal noise@ rust on (od+ o* the e9uiment and comonent arts@ etc.C 2. :il level> onservator #an& Main
S'#%&.&#, T&# P#&", D/= M3-< Y1 Y;-10 ;es = = =
R#*$/C&#&*/S*,*,/S*.# P#%*&"$ %ear PP and carr+ (asic tools@ multi=meter@ cli=on=ammeter@ etc. Ma&e entries o* the o(servations in chec& sheetsDnote (oo&.
;es
=
=
=
onservator ;es
=
=
=
4. :il level> /ushings
;es
5. )e=railing loc&ing devices ".ooling S+stem A,C> ans
;es ;es
= =
= =
= =
7. ooling S+stemA:C> :il ;es irculation Pums
=
=
=
8. :il #emerature Gauges !. :il #emerature Indicators 1. %inding #emerature Gauges 11. %inding #emerature Indicators 12. Ground onnections o* Neutral #erminal
;es ;es ;es
= = =
= = =
= = =
Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e intact as er design Should (e as er trans*ormer construction design and oerative. hec& *or roer seed@ correct direction and nois+ (earings. Should (e as er trans*ormer construction design and oerative. hec& *or correct direction and nois+ (earings. Should (e health+ and accurate Should (e : at localDremote Should (e health+ and accurate
;es
=
=
=
Should (e : at localDremote
;es
=
=
=
13. Ground onnections o* ;es /od+ #an&
=
=
=
Measure neutral current -ith cli= on=ammeter to ensure health+ connection (et-een terminal and the earth mesh. #rans*ormer neutral is grounded at t-o oints i.e. -ith earth mesh and -ith searate earth electrode. Should (e roer and tight. Measure lea&age current -ith cli=on=
3. :il level> #an& :0#
14. Ground onnections o* ;es #ertiar+ %inding #erminal as alica(le Asee note at the endC
=
=
=
15. Silica=gel /reather o* ;es Main onservator #an&
=
=
=
1". Silica=gel /reather o* ;es :0# onservator #an&
=
=
=
17. :il 0ea&ages all around ;es the trans*ormer 18. /ushing ondition AE@ ;es 0@ Neutral@ #ertiar+@ etc.C 1!. /ushing #erminal ;es onnections AE@ 0 @Neutral@ #ertiar+@ etc.C
=
=
=
=
=
=
=
;es
=
2. adiator #u(es iture
=
=
=
;es
ammeter to ensure health+ connection (et-een the (od+ tan& and earth mesh. #rans*ormer (od+ tan& has t-o grounding oints. Measure neutral current -ith cli= on=ammeter to ensure health+ connection (et-een the terminal and earth mesh. /u((ling in the oil indicates health+ (reathing. #he colour o* silica=gel should (e /0$ and oil in glass ot clean. I* 1D3 volume o* the silica=gel has changed colour into PIN then recondition or relace the -hole silica=gel /u((ling in the oil indicates health+ (reathing. #he colour o* silica=gel should (e /0$ colour and oil in glass ot clean. I* 1D3 volume o* the silica=gel has changed colour into PIN then recondition or relace the -hole silica=gel Should (e no oil lea&ages Should (e neat and clean@ no damages and no oil lea&s )ismantle connections@ clean roerl+@ al+ corrosion inhi(itor and *iDtight -ith recommended tor9ue. Should (e no hotsotDs A chec& during night atrollingDthermovision surve+C. %hile handling (ushing terminal connections@ ta&e care o* oil sealing s+stem@ arcing horns Ai* rovidedC@ the sacing (et-een electrodes should (e as er recommendations andDor in accordance -ith 1cm er & o* the rated hase=to=ground voltage. In 5D22& trans*ormers@ tertiar+ -inding terminals are enclosed in searate cu(icle@ give secial attention to -ater roo*ing and vermin roo*ing o* the cu(icle. Should (e secured -ith roer
21.adiator #u(es alves
clamingDsuorts #he valves should al-a+s (e &et oened@ oerative and no oil lea&s Athe temerature o* radiator tu(es should (e o(served (+ touching the tu(es and *eeling the degree o* hotness (+ comarison -ith each other tu(e Should (e intact@ no damages@ and health+ micro s-itch and -iring terminal connections Should (e oerative@ no damages@ arromar& oints to-ard o conservator tan&@ .5 to 1o ascending level to-ards conservator tan&@ gas samling valve oerative Ain some models a searate device *or gas collection is rovided near ground level o* the trans*ormer tan&C @ no oil lea&s@ cover ac&ing health+@ neat 6 clean@ roer glands at -iring ca(le entrance and moisture roo*ing@ -iring terminals tight@ velocit+ setting A"5D1D15 cm er second@ *actor+ setting is normall+ at 1 cmDsC@ etc.
=
=
;es
=
22. Pressure elie* )evices = AP)CD,uto eset elie* ent 23. /uchhol< ela+ =
=
;es
=
=
;es
=
=
=
=
Should (e : and no de*ectDdamage
;es
=
=
Should (e intact and oerative
=
;es
=
Should (e tight and secured
;es
=
=
Should (e as er design@ health+ and secured
=
=
=
Should (e : and no de*ectDdamage
C"" C7&%# 24. )oors@ )oor loc&s@ )oor ;es ac&ing@ )oor stos@ 0ight@ leaning@ Ground connections@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ etc. 25. Sace heaters 6 = #hermostat setting 2". %iring and #erminal = /loc&s 27. ontrol S-itches and = ,ccessories O L"*, T*' C*+#$ (OLTC) 28. Motor drive unit cu(icle> ;es )oors@ )oor loc&s@ )oor stos@ )oor ac&ing@ 0ight@ leaning@ Proer glands at -iring ca(le entrance@ %iring
ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 2!. #a Position Indication A0ocalDemoteC 3. Motor drive unit cu(icle> %iring and #erminal /loc&s 31. Motor drive unit cu(icle> Sace heaters 6 #hermostat setting 32. Motor drive unit cu(icle> ontrols and ,ccessories 33. Motor drive unit cu(icle> :eration ounter eading
;es
=
=
=
Should (e : and no de*ect
=
=
;es
=
Should (e tight and secured
;es
=
=
=
Should (e intact and oerative
;es
=
=
=
Should (e : and no de*ectDdamage
;es
=
=
=
34. Motor drive unit cu(icle> Ste=(+=Ste unction 35. Motor drive unit cu(icle> treme lectrical 0imits Sto unction Aon (oth raiseDlo-er endsC 3".Motor drive unit cu(icle> treme Mechanical 0imits Sto unction Aon (oth raiseDlo-er endsC 3!.Motor drive unit cu(icle> Sa*et+ S-itch unction 4. Motor drive unit cu(icle> mergenc+ Sto unction 41. Motor drive unit cu(icle> Gear(o 0u(rication :il 0evel and ondition
=
=
;es
=
Should (e health+ *unctioning. ecord reading *or over hauling re*erence Should (e health+ *unctioning
=
=
;es
=
Should (e health+ *unctioning
=
=
;es
=
Should (e health+ *unctioning
=
=
;es
=
Should (e health+ *unctioning
=
=
;es
=
Should (e health+ *unctioning
=
=
;es
=
42. Motor drive unit cu(icle> Motor )rive /elt #ension and ondition 43. /evel Gear(oes Greasing 44. ,uto oltage egulator A,C Ai* alica(leC 45. Insection and :verhauling o* :I0#,P :0#. Insection and :verhauling o* :0# )iverter S-itches
=
=
;es
=
Should (e : as er indicator. elace oil as alica(le and -ith recommended t+e o* oil. #he indicator should (e &et clean and visi(le Should (e : as er original design
=
=
=
;es
=
=
;es
=
=
=
=
;es
,l+ grease. nsure *or intact -ater roo*ing o* the (o eri*+ settings ,s er seci*ications Aoverhauling o* :0# is due a*ter 4=5 +ears or a*ter seci*ied num(er o* oerations@ -hichever comes *irstC.
Acleaning@ chec&ing contacts@ measurement o* transition resistors value@ relacements as alica(le@ etc.C 4". Simultaneous :eration = o* )iverter S-itches i* more than one units are rovided 47. otation 0ac& /alancing =
48. )iverter omartment ela+ AS21 modelsC
=
=
;es
=
=
;es
=
;es
=
=
=
;es
=
=
=
=
;es
=
=
=
;es
=
=
=
;es
S-itch = Protective or other
=
;es
=
=
;es
=
S-itch = Protective or other
4!. :0# #est :erations Aaise and 0o-erC 5. Insection and :verhauling o* ,$#,P :0#. Insection and :verhauling o* :0# )iverter S-itches Acleaning@ chec&ing o* vacuum interruters@ measurement o* transition resistors value@ relacements as alica(le@ etc.C 51. Simultaneous :eration o* )iverter S-itches i* more than one units are rovided 52. otation 0ac& /alancing 53. )iverter omartment ela+ AS21 modelsC
54. :0# #est :erations
=
,ll the )iverter S-itches must oerate -ithin hal*=c+cle o* hand cran&ing Should (e e9ual rotations *or aise and 0o-er oeration a*ter s-itching action in the diverter s-itch Should (e oerative@ no damages@ arromar& oints to-ard o conservator tan&@ .5 to 1o ascending level to-ards conservator tan&@ no oil lea&s@ cover ac&ing health+@ roer glands at -iring ca(le entrance and moisture roo*ing@ neat 6 clean@ -iring terminals tight@ etc. Should (e : *rom 0ocalDemote andDor ,uto ,$#,P :0# Ma&e> M and #+eJ has (een rovided in 132D11& Po-er #rans*ormers and t+e in 22D132& ,uto #rans*ormers. InsectionDoverhauling has (een recommended a*ter 3@ oeration as er technical seci*ications. ,ll the )iverter S-itches must oerate -ithin hal*=c+cle o* hand cran&ing Should (e e9ual rotations *or aise and 0o-er oeration Should (e oerative@ no damages@ arromar& oints to-ard o conservator tan&@ .5 to 1o ascending level to-ards conservator tan&@ no oil lea&s@ cover ac&ing health+@ roer glands at -iring ca(le entrance and moisture roo*ing@ neat 6 clean@ -iring terminals tight@ etc. Should (e : *rom 0ocal@ emote
Aaise and 0o-erC OFF LOAD TAP CHANGER (&. *''&%*7#) 55. :** 0oad #a hanger = = ;es #est :eration T#$$ 5". )S test o* :il o* main = = ;es tan& and :0# comartments 57. hemical ,nal+sis o* :il
andDor ,uto =
Should (e : *rom 0ocal
=
)S value should (e Q3&@ 4&@ 5& at 2.5 mm ga *or ""&@ 132&@ 22&D 5& resectivel+ Should (e as er test la(orator+ seci*ications Should (e as er test la(orator+ seci*ications Should (e as er test la(orator+ seci*ications Should (e as er commissioning test results andDor seci*ications a*ter correction o* test results at 2 Should (e as er commissioning test results andDor seci*ications a*ter correction o* test results at 2 Should (e as er commissioning test results andDor seci*ications a*ter correction o* test results at 2
=
=
=
;es
58. #angent )elta A#an RC test = o* :il 5!. )issolved Gases ,nal+sis = A)G,C o* oil ". Insulation esistance test = AMegger testC o* %indings
=
=
;es
=
;es
=
=
;es
=
"1. Insulation esistance test AMegger testC o* ore andDor laming "2. Insulation esistance test o* tertiar+ (us (ar o* single= hase (an& connection trans*ormers "3. aacitance and )issiation actor test A6) testC o* -indings and (ushings "4. #rans*ormer #urn atio test A## testC
=
=
;es
=
=
=
;es
=
=
=
;es
=
=
=
;es
=
"5. Short circuit test Asecial testC
=
=
;es
=
"". :en circuit test Asecial = testC
=
;es
=
Should (e as er commissioning test results andDor seci*ications a*ter correction o* O) test results at 2 Should (e as er commissioning test results andDor seci*ication Atolerance> T .5O (et-een calculated and measured valuesC Should (e as er commissioning test results and (alanced current values. In the short circuited F; -inding@ chec& *or a(normal current value in neutral lead during :0# oeration -hich indicates damage to transition resistors o* :0#. #he alied 3= hase voltage should also (e (alanced Should (e as er commissioning test results and (alanced voltage ratio. #his test is also a su(stitute o* ## test. #he alied 3=hase voltage should also (e (alanced
"7. %inding esistance test
=
=
;es
=
"8. S-ee re9uenc+ esonse ,nal+sis AS,C "!. /uchhol< ela+ *unctional testsJ ,larm and #ri@ Indications and ,larm 7. :0# Protective ela+ *unctional testsJ #ri and eset@ Indications Alocal mechanical and remoteC and ,larm 71. :il temeratureJ ,larm and #ri test@ Indications and ,larm 72. %inding temeratureJ ,larm and #ri test@ Indications and ,larm 73. Pressure elie* )evice AP)CJ #ri test@ Indications Alocal@ mechanical and remoteC and ,larm
=
=
=
;es
=
=
;es
=
Should (e as er commissioning test results andDor seci*ications a*ter correction o* test results at 75 AC Should (e as er commissioning test results and Dor *actor+ test results Should (e : and intact
=
=
;es
=
Should (e : and intact
=
=
;es
=
Should (e : and intact
=
=
;es
=
Should (e : and intact
=
=
;es
=
Should (e : and intact
N"#! TERTIARY =INDING (T*$."#$ 8& "# * 8" 8&,&+$) %hen a o-er trans*ormer or auto trans*ormer is F; connected (oth on high voltage and lovoltage@ trile *re9uenc+ comonent A3rd harmonicC o* the magneti
In the event o* *ailure o* one hase o* three=hase core=t+e trans*ormer@ it cannot (e oerated -ith t-o hases in oen=delta@ unless the entire damaged hase is removed *rom the core@ or unless ever+ damaged turn is oen=circuited and the series connection (et-een the other coils o* the damaged hase (ro&en in three or *our laces. #hree=hase trans*ormers are usuall+ arranged *or simultaneous loading on all three -indings. In man+ trans*ormers@ it is ermissi(le to ta&e *ull=load current *rom (oth the secondar+ and tertiar+ -indings@ rovided the o-er=*actor (et-een these loads is such that onl+ *ull=load current is dra-n *rom the rimar+. #here are other cases -here the trans*ormer has not (een designed to dissiate the losses due to *ull=load current in all three -indings -ithout over=heating. #hese -indings should (e loaded in accordance -ith namelate seci*ications.
P"#%&" ". ."*&+ 8&,&+$
%indings -hich are not connected to a transmission s+stem or load ma+ (e termed F*loating -indings. $nder un*avoura(le conditions@ such as lightning@ and arcing grounds@ these -indings ma+ assume a(normall+ high electrostatic charges. It is desira(le to guard against such charges (+ grounding the neutral i* F; connected@ or one corner o* the delta@ i* delta connected. I* it is not ossi(le to do this@ rovide suita(le lightning arresters@ or connect the circuit Aor at least one leadC to a load or net-or& having large caacitance to ground. REFERENCE@ Instructional manual o* anadian General lectric AGC Guelh@ :ntario anada ma&e 45 M, A315C@ 5D22D11& auto trans*ormers@ +ear o* manu*acturing 1!7" at 5 & GDS Gatti@ aisala(adC. N"#! CORRECTION OF INSULATION RESISTANCE TEST RESULTS AT STANDARD TEMP ERATURE 20 C /ecause most o* the insulation materials have a negative temerature co=e**icient i.e. @ the resistance decreases -ith increase in temerature@ so the I value should (e corrected to a standard temerature o* 2 . oughl+ I value decreases to U o* its value *or ever+ 1 rise in the temerature a(ove 2 . So *or correction at 2 @ *or ever+ 1 rise in the temerature a(ove 2 @ increase the measured value to 2 times. ormula *or accurate temerature correction calculationsJ I 2 V It 2WAt B 2C D1 -here I 2 is the corrected value at 2@ t is the temerature o* insulation mass and It is the measured insulation resistance value at temerature t . I value is usuall+ in mega ohms AM XC. N"#! CORRECTION OF =INDING RESISTANCE TEST RESULTS AT STANDARD TEMPERATURE ; C #he measured o* -inding resistance value should (e corrected to a standard temerature o* 75 . 75 V t A235 Y 75C D A235 Y tC Z -here 75 is the corrected value at 75@ t is the -inding temerature and t is the measured -inding resistance value at temerature t .
2! MAINTENANCE OF CIRCUIT BREA9ERS
220V SF< G*$ C&%& B#*# *# SIEMENS * M*+* P"8# H"$#
SOP CHEC9 SHEET@ MAINTENANCE SCHEDULE AND CHEC9S/TESTS OF HV CIRCUIT BREA9ERS D#$%&'&" ". I$'#%&" *, S'#%&.&#, T&# P#&", M*&#*%# =" D/= M3-< Y1 Y;/10
R#*$/C&#&*/S*,*, / S*.# P#%*&"$ %ear PP and carr+ (asic tools@ multi=meter@ cli=on= ammeter@ etc. Ma&e entries o* the o(servations in chec& sheetsDnote (oo&.
1. isual insection A, -al& ;es around visual insection *rom ground level and &eeing in viethe sa*e limits o* aroach to live and moving arts to chec& aarent condition@ a(normal noise@ rust on (od+ o* the e9uiment and comonent arts@ osition o* oening and closing indicators@ etc.C 2. S" Gas Pressure AG/C ;es
=
=
=
=
=
=
3. :il 0evel A:/C
;es
=
=
=
4. ,ir Pressure A,//C
;es
=
=
=
Should (e : as er rated ressureDindicator and corrected at temerature 2 AC. #he indicator should (e &et clean and visi(le. Should (e no gas lea&ages AY.25 (ar *or ever+ 1C Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er rated ressureDindicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er design
=
;es
=
)ismantle connections@ clean
5. Steel Structure Ground ;es onnections ". E #erminal onnections =
roerl+@ al+ corrosion inhi(itor and *iDtight -ith recommended tor9ue. Should (e no hotsotDs Achec& during night atrollingDthermovision surve+C Should (e clean and no damage Should (e : as er design@ and tight and secured
7. Porcelain /ushing ondition
;es
=
=
=
8. Suorting Structure NutD/oltsD0evel C"" C7&%# !. u(icle )oors@ )oor loc&s@ )oor ac&ing@ )oor stos@ 0ight@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 1. ontrol s-itches@ e+ s-itches@ Indications@ ,ccessories@ etc. 11. Sace heaters 6 #hermostat setting 12. %iring and #erminal /loc&s 13. :eration ounter
=
;es
=
=
;es
=
=
=
Should (e : de*ectDdamage
and
no
;es
=
=
=
Should (e : de*ectDdamage
and
no
;es
=
=
=
= ;es
= =
;es =
= =
Should (e intact and oerative Should (e tight and secured Should (e intact and oerative
=
=
=
Should (e : de*ectDdamage
and
no
=
=
=
Should (e : de*ectDdamage
and
no
=
=
=
= =
;es =
= =
;es Motor =
= =
= ;es
= =
o* =
=
;es
=
Should (e intact and oerative Should (e tight and secured Should (e intact and oerative Should (e : neat and clean Should (e : as recommended Ausuall+ [ 15secC Should (e : as er recommendations
M"" S'&+ O'#*&+ M#%*&$ 14. u(icle )oors@ )oor loc&s@ ;es )oor ac&ing@ )oor stos@ 0ight@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 15. ontrol s-itches@ e+ ;es s-itches@ Indications@ ,ccessories@ etc. 1". Sace heaters 6 #hermostat ;es setting 17. %iring and #erminal /loc&s = 18. :eration ounter ;es
1!. leaning 2. losing harging #ime
Sring
21. 0u(rication movingDslidingDrolling arts
22. losing )ash Pot :il 0evel = = 23. :ening )ash Pot :il 0evel = = 24. Manual harging o* losing = = Sring 25. Suorting Structure = ;es NutD/oltsD0evel 2". / loseD:en or :ND: Indication AelectricalDmechanical indicatorsC H,*&% O& P#$$# O'#*&+ M#%*&$ 27. u(icle )oors@ )oor loc&s@ ;es = )oor ac&ing@ )oor stos@ 0ight@ leaning@ roer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 28. ontrol s-itches@ e+ ;es = s-itches@ Indications@ ,ccessories@ etc. 2!. Sace heaters 6 #hermostat ;es = setting 3. %iring and #erminal /loc&s = = 31. :eration ounter ;es =
;es ;es ;es
= = =
Should (e : as er design Should (e : as er design Should (e : as er design
=
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Should (e : as er design@ tight and secured Should (e in accordance -ith the actual osition o* / and : as er design
=
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Should (e : de*ectDdamage
and
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=
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Should (e : de*ectDdamage
and
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=
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32. E+draulic :il 0evel 33. E+draulic :il elacement
Should (e intact and oerative Should (e tight and secured Should (e intact and oerative Should (e : as er design Should (e relaced as er recommendations Should (e : as er design Should (e no lea&ages Should (e : as er design Should (e : as er design and remote indications Should (e : as er design@ clean or relace the *ilter as er recommendations Should (e : as er recommendations Should (e : as er recommendations Should (e : as er design@ #ight and secure
;es =
= =
= =
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34. E+draulic :il Pressure ;es 35. E+draulic :il 0ea&ages ;es 3". N2 Gas Pressure = 37. E+draulic :il> 0o- Pressure = ,larm and 0oc&out hec& 38. E+draulic :il ilter hec& =
= = = =
= = ;es ;es
= = = =
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3!. E+draulic :il Pressure Sa*et+ = alve unction hec& 4. E+draulic :il Pum> ut = IND:$# Pressure alue hec& 41. E+draulic :il Pum and ;es ,ccessories Mounting Structure NutD/oltsD0evel P#*&% O'#*&+ M#%*&$ 42. u(icle )oors@ )oor loc&s@ ;es )oor ac&ing@ )oor stos@ 0ight@ leaning@ roer glands at -iring
=
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ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connection@ etc. 43. ontrol s-itches@ e+ ;es s-itches@ Indications@ ,ccessories@ etc. 44. Sace heaters 6 #hermostat ;es
=
=
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=
=
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45. %iring and #erminal /loc&s 4". :eration ounter
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47. ated ,ir Pressure ;es 48. ated ,ir Pressure> 0o- = Pressure ,larm and 0oc&out hec& 4!. ,ir omressor> ,ir Inta&e = ilter hec&
= =
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Should (e intact and oerative Should (e tight and secured Should (e intact and oerative Should (e : as er design Should (e : as er design and remote indications
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=
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5. ,ir omressor> 0u(rication :il 0evel and ondition hec& 51. ,ir omressor> :eration Eours ounter hec& 52. ,ir Pressure> Sa*et+ alve unction hec& 53. ,ir omressor and ,ccessories Mounting Structure NutD/oltsD0evel T#$$ 54. #est :eration> :ND: 0ocalDemoteD,uto
=
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55. / Position Mechanical ;es Indication A:ND:C 5". :il )S #est A:/C =
=
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57. S" Gas Purit+ #est AG/C = 58. S" )e- PointDMoisture = ontents #est AG/C
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=
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Should (e : as er design@ clean or relace *ilter as er recommendations Should (e : as er design@ relace oil as recommended Should (e intact and oerative Should (e : as er recommendations Should (e : as er design@ and tight and secured
Should (e intact and oerative along -ith remote indications Should (e correct as er actual osition )S value should (e Q4 at 2.5 mm ga@ elace oil a*ter 1 triing Purit+ should (e Q !7 O )e- oint should (e Q=15 or Moisture contents should (e [ 5 PPm Should (e : as recommended Should (e : as recommended. #he ermissi(le di**erences (et-een timings o* 3=oles
"1. ,nti=Puming eature hec& = "2. Pole )iscreanc+ ontrol = eature hec& Aalica(le in single=ole oerated /sC "3. Minimum oltage = loseD:en #est
= =
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"4. S" Gas> 0o- Pressure ,larm = and 0oc&out hec&
=
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and (et-een timings o* (rea&s -ithin 1=ole are> losing time> 5ms A1D4 c+cleC :ening time> 3.33ms A1D" c+cleC %ithin (rea&s o* 1=ole> 2.5ms A1D8 c+cleC Should (e : and intact Should (e : and intact@ remote indication
#he / should oen at 5= 75O voltage o* rated value and close at 8O voltage o* rated value Should (e : as er design and remote indications
3! MAINTENANCE OF ISOLATORS/DISCONNECT S=ITCHES
220V I$"*"/D&$%"#% $8&% * ;00 V G/S NTDC S#&'*
SOP CHEC9 SHEET@ MAINTENANCE SCHEDULE AND CHEC9S/TESTS OF ISOLATORS/DISCONNECT S=ITCHES (BUS BAR AND LINE) D#$%&'&" ". I$'#%&" *, M*&#*%# ="
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M3-< =
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Should (e : either *ull+ losed or :ened Should (e : as er contact *ingers design Should (e : as er design Should (e : as er design Should (e intact and no damages Should (e : as er design
8. E #erminal onnections
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Should (e : as er design and no hotsotDs Achec& during night atrolling D thermovision surve+C Should (e lean and no damage Should (e : as er design
!. Porcelain Insulator ;es ondition 1. Porcelain Insulator (ase = (earing condition 6 lu(rication 1. Suorting Structure ;es NutD/oltsD0evel E* S8&% (F" L&# I$"*") 11. arth /ladeDontact ;es ,lignment AloseD:enC 12. ontact GriDPressure ;es Alose PositionC 13. Mechanical Stos ;es 14. Ground onnections ;es 15. Inter Phases Mechanical ;es 0in&ages C"" C7&%# 1". u(icle )oors@ )oor loc&s@ ;es )oor ac&ing@ )oor stos@ 0ight@ leaning@ roer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 17. ontrol s-itches@ e+ ;es s-itches@ Indications@ ,ccessories@ etc. 18. Sace heaters 6 ;es #hermostat setting 1!. %iring and #erminal = /loc&s 2. :eration ounter ;es O'#*&+ M#%*&$ ". I$"*" 21. u(icle )oors@ )oor loc&s@ ;es )oor ac&ing@ )oor stos@ 0ight@ leaning@ roer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 22. ontrol s-itches@ e+ ;es s-itches@ Indications@ ,ccessories@ etc.
=
=
=
=
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=
=
=
=
Should (e : as er design and tight and secured
=
=
=
=
=
=
= = =
= = =
= = =
Should (e : either *ull+ losed or :ened Should (e : as er contact *ingers design Should (e : as er design Should (e : as er design Should (e intact and no damages
=
=
=
Should (e : de*ectDdamage
and
no
=
=
=
Should (e : de*ectDdamage
and
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=
=
=
Should (e intact and oerative
=
;es
=
Should (e tight and secured
=
=
=
Should (e intact and oerative
=
=
=
Should (e : de*ectDdamage
and
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=
=
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and
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23. Sace heaters 6 ;es = #hermostat setting 24. %iring and #erminal = = /loc&s 25. :eration ounter ;es = 2". leaning ;es = 27. 0u(rication o* = = movingDslidingDrolling arts 28. Manual :eration> = = loseD:en 2!. Suorting Structure = ;es NutD/oltsD0evel 3.Ground Potential Gradient ;es ontrol Mat ondition and Grounding O'#*&+ M#%*&$ ". E* S8&% 31. u(icle )oors@ )oor loc&s@ ;es = )oor ac&ing@ )oor stos@ 0ight@ leaning@ roer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 32. ontrol s-itches@ e+ ;es = s-itches@ Indications@ ,ccessories@ etc. 33. Sace heaters 6 ;es = #hermostat setting 34. %iring and #erminal = = /loc&s 35. :eration ounter ;es = 35. leaning ;es = 3". 0u(rication o* = = movingDslidingDrolling arts 38. Manual :eration> = = loseD:en 3!. Suorting Structure = ;es NutD/oltsD0evel 4.Ground Potential Gradient ;es ontrol Mat ondition and Grounding T#$$ 41. #est :eration> :ND: = = 0ocalDemote Ahec& Scheme *or arth S-itch #est :erationC
=
=
Should (e intact and oerative
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=
Should (e tight and secured
= = ;es
= = =
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Should (e intact and oerative Should (e : neat and clean Should (e : as er recommendations Should (e intact and oerative
=
=
Should (e : as er design@ tight and secured Should (e : as er design@ tight and secured
=
=
Should (e : de*ectDdamage
and
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=
=
Should (e : de*ectDdamage
and
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=
=
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=
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= = ;es
= = =
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=
Should (e intact and oerative Should (e : neat and clean Should (e : as er recommendations Should (e intact and oerative
=
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;es
=
Should (e intact and oerative along -ith remote semahore indications
42. ontact esistance #est
=
=
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=
43. Mechanical Inter 0oc&ing = 44. lectrical Inter 0oc&ing = %ith / 45. Inter 0oc&ing /et-een = Isolator and arth S-itch
= =
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= =
Should (e : as recommended Should (e : as er design Should (e : as er scheme
=
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=
Should (e : as er scheme
:! MAINTENANE OF CURRENT TRANSFORMERS (CT)
220V C# T*$."# * ;;0V G/S NTDC S#&'*
SOP CHEC9 SHEET@ MAINTENANCE SCHEDULE CHEC9S/TESTS OF CURRENT TRANSFORMERS (CT) D#$%&'&" ". &$'#%&" *, *&#*%# 8" 1. isual insection A, -al& around visual insection *rom ground level and &eeing in viethe sa*e limits o* aroach to live and moving arts to chec& aarent condition@ a(normal noise@ rust on (od+ o* the e9uiment and comonent arts@ etc.C 2. :il 0evel
S'#%&.&#, T&# P#&",
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3. E #erminal ;es onnections AP16P2C
=
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4. Porcelain /ushing ondition 5. Suorting Structure NutD/oltsD0evel ". Ground onnections 7.Secondar+ #erminal /o> over@ over loc&s@ over ac&ing@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 8. Secondar+ #erminal onnections T#$$ !. )S test o* :il Asecial testC
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=
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Should (e : as er design@ tight and secured Should (e : as er design Should (e : and no damageDno de*ect@ -ater roo*ing 6 vermin roo*ing intact
=
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=
Should (e tight and secured
=
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1. hemical ,nal+sis o* = :il Asecial testC 11. #angent )elta A#an RC = test o* :il Asecial testC
=
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=
=
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)S value should (e Q3&@ 4&@ 5& at 2.5 mm ga *or ""&@ 132&@ 22&D 5& resectivel+ Should (e as er test la(orator+ seci*ications Should (e as er test la(orator+ seci*ications
%ear PP and carr+ (asic tools@ multi=meter@ cli=on=ammeter@ etc. Ma&e entries o* the o(servations in chec& sheetsDnote (oo&.
Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er design and no hotsotDs Achec& during night atrollingDthermovision surve+C Should (e clean and no damage
12. )issolved Gases ,nal+sis A)G,C o* oil Asecial testC 13. Insulation esistance test AMegger testC o* %indings 14. aacitance and )issiation actor test A6) testC o* -indings 15. Magneti
=
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=
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Should (e as er commissioning test results andDor seci*ications a*ter correction o* test results at 2 Should (e as er commissioning test results andDor seci*ications a*ter correction o* O) results at 2 Should (e as er commissioning test results and Dor seci*ication
=
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,s er selected rimar+Dsecondar+ current ratio and Dor seci*ications. ,ccurac+ test results should (e in accordance -ith the relevant MeteringD Protection core seci*ications. Should (e : as er design
=
=
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=
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=
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=
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17. Nitrogen AN2C Gas = Pressure hec& Ai* alica(leC M*$*&+ 9&"$/C7&%# 18. )oors@ )oor loc&s@ ;es )oor ac&ing@ )oor stos@ 0ight@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 1!. Sace heaters 6 ;es #hermostat setting 2. %iring and #erminal = /loc&s
;! MAINTENANCE OF POTENTIAL TRANSFORMERS (PT)
132 V P"#&* T*$."#$ (B$ 7* PT) * 220V G/S NTDC N9LP L*"#
SOP CHEC9 SHEET@ MAINTENANCE SCHEDULE AND CHEC9S/TESTS OF POTENTIAL TRANSFORMERS (PT) D#$%&'&" ". I$'#%&" S'#%&.&#, T&# P#&", *, M*&#*%# =" D/= M3/M< Y1 Y;/10 1. isual insection A, ;es = = = -al& around visual insection *rom ground level and &eeing in viethe sa*e limits o* aroach to live and moving arts to chec& aarent condition@ a(normal noise@ rust on (od+ o* the e9uiment and comonent arts@ etc.C 2. :il 0evel ;es = = =
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Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er design and no hotsotDs Achec& during night atrollingDthermovision surve+C Should (e clean and no damage
3. E #erminal ;es onnections A0ineC
=
=
=
4. Porcelain /ushing ondition 5. Suorting Structure NutD/oltsD0evel ". Ground onnections 7. Secondar+ #erminal /o> over@ over loc&s@ over ac&ing@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 8. Secondar+ #erminal onnections T#$$ !. )S test o* :il Asecial testC
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=
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=
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1. hemical ,nal+sis o* = :il Asecial testC 11. #angent )elta A#an RC = test o* :il Asecial testC 12. )issolved Gases = ,nal+sis A)G,C o* :il
=
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Asecial testC 13. Insulation esistance test AMegger testC o* %indings 14. oltage atio and ,ccurac+ #est Asecial testC M*$*&+ 9&"$/C7&%# 15. )oors@ )oor loc&s@ )oor ac&ing@ )oor stos@ 0ight@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 1". Sace heaters 6 #hermostat setting 17. %iring and #erminal /loc&s
=
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2209V C*'*%&" V"*+# T*$."# (M*#@ HAEFELY) * 2206 G/S NTDC S*,& R"*, F*&$**7*,
SOP CHEC9 SHEET@ MAINTENANCE SCHEDULE AND CHEC9S/TESTS OF CAPACITOR VOLTAGE TRANSFORMERS (CVT) D#$%&'&" ". I$'#%&" S'#%&.&#, T&# P#&", *, M*&#*%# =" D/= M3/M< Y1 Y;/10 1. isual insection A, ;es = = = -al& around visual insection *rom ground level and &eeing in viethe sa*e limits o* aroach to live and moving arts to chec& aarent condition@ a(normal noise@ rust on (od+ o* the e9uiment and comonent arts@ etc.C 2. :il 0evel o* aacitors ;es = = =
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Should (e : as er indicator i* alica(le. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er indicator. #he indicator should (e &et clean and visi(le. Should (e no oil lea&ages Should (e : as er design and no hotsotDs Achec& during night atrollingDthermovision surve+C Should (e clean and no damage
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11. hemical ,nal+sis o* :il Asecial testC 12. #angent )elta A#an RC test o* :il Asecial testC 13. )issolved Gases ,nal+sis A)G,C o* oil Asecial testC 14. Insulation esistance test AMegger testC o* %indings 15. aacitance and )issiation actor test A6) testC 1". oltage atio and ,ccurac+ #est M*$*&+ 9&"$/C7&%# 17. )oors@ )oor loc&s@ )oor ac&ing@ )oor stos@ 0ight@ leaning@ Proer glands at -iring ca(le entrance@ %iring ca(le num(ering@ ermin roo*ing@ Ground connections@ etc. 18. Sace heaters 6 #hermostat setting 1!. %iring and #erminal /loc&s
=
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! MAINTENANCE OF SURGE ARRESTERS/LIGHTNING ARRESTERS
;00 9V S+# A#$#$ * ;00 V G/S NTDC S#&'*
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3. Porcelain /ushing ondition 4. orona ing ondition 5. Suorting Structure NutD/oltsD0evel ". Ground onnections Aat 0D, /ase Plate@ :eration ounter and Steel suort StructureC 7. :eration ounter ondition and eading 8. 0ea&age urrent Monitor A:tional and (uilt in accessor+ in the oeration counterC@ Proer glands at -iring ca(le entrance@ ermin roo*ing@ Ground connections@ etc. !. Insulators (et-een 0D, /ase Plate and Steel Suort Structure 1. Insulation o* onductor (et-een 0D, /ase Plate and :eration ounter T#$$ 11. Insulation esistance test AMegger testC
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