Mavs

Service Manual Type MAVS Check Synchronising Relay 

Service Manual Manual Type MAVS Check Synchronising Relay 

HANDLING OF ELECTRONIC EQUIPMENT A person's normal movements can easily generate electrostatic potentials of several thousand volts. Discharge of these voltages into semiconductor devices when handling electronic circuits can cause serious damage, which often may not be immediately apparent but the reliability of the circuit will have been reduced. The electronic circuits of ALSTOM T&D Protection & Control Ltd products are completely safe from electrostatic discharge when housed in the case. Do not expose them to the risk of damage by withdrawing modules unnecessarily. Each module incorporates the highest practicable protection for its semiconductor devices. However, if it becomes necessary to withdraw a module, the following precautions should be taken to preserve the high reliability and long life for which the equipment has been designed and manufactured. 1. Before removing removing a module, module, ensure ensure that you you are at the same same electrostat electrostatic ic potential potential as the equipment equipment by touching the case. 2. Handle the the module module by its front-pl front-plate, ate, frame, frame, or edges edges of the the printed printed circuit circuit board. board. Avoid touching the electronic components, printed circuit track or connectors. 3. Do not pass pass the module module to any person person without first ensuring ensuring that you are both both at the the same electrostatic potential. Shaking hands achieves equipotential. 4. Place the the module module on an antistat antistatic ic surface, surface, or on a conducting conducting surface surface which is at the same same potential as yourself. 5. Store Store or transpo transport rt the modul modulee in a conducti conductive ve bag. bag. More information on safe working procedures for all electronic equipment can be found in BS5783 and IEC 60147-0F. If you are making measurements on the internal electronic circuitry of an equipment in service, it is preferable that you are earthed to the case with a conductive wrist strap. Wrist straps should have a resistance to ground between 500k – 10M ohms. If a wrist strap is not available, you should maintain regular contact with the case to prevent the build up of static. Instrumentation which may be used for making measurements should be earthed to the case whenever possible. ALSTOM T&D Protection & Control Ltd strongly recommends that detailed investigations on the electronic circuitry, or modification work, should be carried out in a Special Handling Area such as described in BS5783 or IEC 60147-0F.

TYPE TYPES S

MAVS MAVS 01, 01, MAV MAVS S 02, 02, MAVS MAVS 03

CONTENTS SAFETY SECTION

5

1. 1.1 1.2 1.3 1.4 1.5 1.6

SETTINGS Phase angle setting Dead Line/Live Bus (DL/LB) and Live Line/Dead Bus (LL/DB) Timer settings Undervoltage blocking setting (when fitted – MAVS 01 only) Differential voltage blocking (when fitted – MAVS 02 only) AC Auxiliary supply relays

9 9 9 10 10 11 11

2 2.1 2.2

INSTALLATION General Storage

11 11 12

3. 3.1 3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 3.2 3.3 3.3.1 3.3.2 3.3.3 3.4 3.6 3.7 3.8 3.9 3.11 3.11.1 3.11.2 3.11.3

COMMISSIONING Commissioning preliminaries Electrostatic discharges (ESD) Inspection Wiring Earthing Insulation Test equipment required (basic) Preliminary relay settings Applicable to all relays (MAVS 01, 02 and 03) Applicable to MAVS 01 relay only Applicable to MAVS 02 relay only Preliminary preparation for relay secondary injection tests Test on under-voltage blocking calibration (MAVS 01 only) Differential voltage blocking (MAVS02 only) Tests on DL/LB and LL/DB facilities auxiliary supply relay (all relays) Slip frequency timer (ts) calibration tests System checks Auxiliary supply VT phasing External contact wiring/’check’ inhibition

12 12 12 12 12 13 13 13 13 13 13 13 14 14 15 15 17 17 17 17 18

4.

MAINTENANCE

21

5. 5.1 5.2

PROBLEM ANALYSIS General Pr Procedure

21 21 21

6.

REPAIRS

24

7.

COMMISSIONING TEST RECORD

29

REPAIR FORM

31 4

SAFETY SECTION This Safety Section should be read before commencing any work on the equipment. Health and safety  The information in the Safety Section of the product documentation is intended to ensure that products are properly installed and handled in order to maintain them in a safe condition. It is assumed that everyone who will be associated with the equipment will be familiar with the contents of the Safety Section.

Explanation of symbols and labels The meaning of symbols and labels which may be used on the equipment or in the product documentation, is given below.

Caution: refer to product documentation

Caution: risk of electric shock

Protective/safety *earth terminal

Functional *earth terminal. Note: this symbol may also be used for a protective/ safety earth terminal if that terminal is part of a terminal block or sub-assembly eg. power supply.

*Note: The term earth used througho throughout ut the product product documentation documentation is the direct direct equivalent of the North American term ground.

Installing, Commissioning and Servicing Equipment connections Personnel undertaking installation, commissioning or servicing work on this equipment should be aware of the correct working procedures to ensure safety. The product documentation should be consulted before installing, commissioning or servicing the equipment. Terminals exposed during installation, commissioning and maintenance may present a hazardous voltage unless the equipment is electrically isolated. If there is unlocked access to the rear of the equipment, care should be taken by all personnel to avoid electric shock or energy hazards. Voltage and current connections should be made using insulated crimp terminations to ensure that terminal block insulation requirements are maintained for safety. To ensure that wires are correctly terminated, the correct crimp terminal and tool for the wire size should be used. 5

Before energising the equipment it must be earthed using the protective earth terminal, or the appropriate termination of the supply plug in the case of plug connected equipment. Omitting or disconnecting the equipment earth may cause a safety hazard. The recommended minimum earth wire size is 2.5 mm2, unless otherwise stated in the technical data section of the product documentation. Before energising the equipment, the following should be checked: Voltage rating and polarity; CT circuit rating and integrity of connections; Protective fuse rating; Integrity of earth connection (where ( where applicable )

Equipment operating conditions The equipment should be operated within the specified electrical and environmental limits. Current transformer circuits Do not open the secondary circuit of a live CT since the high voltage produced may be lethal to personnel and could damage insulation. External resistors Where external resistors are fitted to relays, these may present a risk of electric shock or burns, if touched. Battery replacement  Where internal batteries are fitted they should be replaced with the recommended type and be installed with the correct polarity, to avoid possible damage to the equipment.

Insulation and dielectric strength testing Insulation testing may leave capacitors charged up to a hazardous voltage. At the end of each part of the test, the voltage should be gradually reduced to zero, to discharge capacitors, before the test leads are disconnected.

Insertion of modules and pcb cards These must not be inserted into or withdrawn from equipment whilst it is energised, since this may result in damage.

Fibre optic communication Where fibre optic communication devices are fitted, these should not be viewed directly. Optical power meters should be used to determine the operation or signal level of the device.

6

Older Products Electrical adjustments Equipments which require direct physical adjustments to their operating mechanism to change current or voltage settings, should have the electrical power removed before making the change, to avoid any risk of electric shock.

Mechanical adjustments The electrical power to the relay contacts should be removed before checking any mechanical settings, to avoid any risk of electric shock.

Draw out case relays Removal of the cover on equipment incorporating electromechanical operating elements, may expose hazardous live parts such as relay contacts.

Insertion and withdrawal of extender cards When using an extender card, this should not be inserted or withdrawn from the equipment whilst it is energised. This is to avoid possible shock or damage hazards. Hazardous live voltages may be accessible on the extender card.

Insertion and withdrawal of heavy current test plugs When using a heavy current test plug, CT shorting links must be in place before insertion or removal, to avoid potentially lethal voltages.

Decommissioning Decommissioning and Disposal Decommissioning: The auxiliary supply circuit in the relay may include capacitors across the supply or to earth. To avoid electric shock or energy hazards, after completely isolating the supplies to the relay (both poles of any dc supply), the capacitors should be safely discharged via the external terminals prior to decommissioning. Disposal:

It is recommended that incineration and disposal to water courses is avoided. The product should be disposed of in a safe manner. Any products containing batteries should have them removed before disposal, taking precautions to avoid short circuits. Particular regulations within the country of operation, may apply to the disposal of lithium batteries.

7

Technical Specifications Protective fuse rating The recommended maximum rating of the external protective fuse for this equipment is 16A, Red Spot type or equivalent, unless otherwise stated in the technical data section of the product documentation.

Insulation class: IEC IEC 610 61010 10-1 -1:: 1990 1990/A /A2: 2: 1995 1995 This This equi equipm pmen entt req requi uire ress a Class I protective (safety) earth EN 6101 610100-1: 1: 1993 1993/A /A2: 2: 1995 1995 conn connec ectition on to ensu ensure re user user Class I safety. Installation Category  (Overvoltage):

IEC IEC 610 61010 10-1 -1:: 1990 1990/A /A2: 2: 1995 1995 Dist Distri ribu butition on leve level, l, fixe fixed d Category III installation. Equipment in EN 6101 610100-1: 1: 1993 1993/A /A2: 2: 1995 1995 this this cate catego gory ry is qual qualif ific icat atio ionn Category III tested at 5kV peak, 1.2/50µs, 500Ω, 0.5J, between all supply circuits and earth and also between independent circuits.

Environment:

IEC IEC 6101 610100-1: 1: 1990 1990/A /A2: 2: 1995 1995 Comp Complilian ance ce is is demo demons nstr trat ated ed by by Pollution degree 2 reference to generic safety EN 6101 1010-1 0-1: 1993 993/A2: 199 1995 sta standards. Pollution degree 2

Product safety:

73/23/EEC

Compliance with the European Commission Low Voltage Directive.

EN 6101 610100-1: 1: 1993 1993/A /A2: 2: 1995 1995 Comp Complilian ance ce is demo demons nstr trat ated ed EN 6095 60950: 0: 1992 1992/A /A11 11:: 1997 1997 by refe refere renc ncee to gene generi ricc safe safety ty standards.

8

Section 1. 1. SETTINGS 1 .1

Phase angle setting The phase angle setting is achieved via the top five slider switches in the upper left hand box on the relay nameplate. The feature is marked: θ = 5° + ∑

indicating that the phase angle setting is a fixed 5° plus any combination of the five slider switches, labelled 2.5°, 5°, 10°, 20°, 40°, giving a setting range of 5 ° to 82.5° in 2.5 ° steps. Example

θ = 5° + ∑

0 0

<— —>

2.5° 5°

0 0 0 IN

<— —> <—

10° θ = 5° + 5° + 20° = 30° 20° 40° OUT DL/LB

The relay will reset at setting +0°, –2° (or –5%), whichever is greater. It will operate at typically 97% of the actual reset level.

1.2 1.2

Dead De ad Line Line/L /Liv ivee Bus Bus (DL/ (DL/LB LB)) and and Live Live Line Line/D /Dea ead d Bus Bus (LL/ (LL/DB DB)) These features are enabled by the three slider switches in the upper left hand box on the relay nameplate. The features are marked: DL/LB – DEAD LINE/LIVE BUS LL/DB – LIVE LINE/DEAD BUS These two features can be independently switched in or OUT. The switch marked: Vn (Ph) or V n (

)

which allows the customer to set these features to phase-to-phase operation Vn (Ph) or phase-to-neutral Vn ( ) operati operation on depend depending ing upon upon the the applica applicatio tion. n. (Note (Note that that if  Vn (Ph) is selected the relay must be connected to phase-to-phase volts, and if V n ( ) is selected the relay must be connected to phase-to-neutral volts). When either the DL/LB or LL/DB features are switched in and the relevant V n (Ph) or Vn ( ) setting setting is chosen, chosen, the the line line or bus is considered considered to be live live above above 40% of rated voltage and dead below 15% of rated voltage. Example

Vn (Ph)

—>

Vn ( )

IN

—>

OUT DL/LB

IN

<—

OUT LL/DB

Settings indicate the live line/dead bus feature is operating in a phase-to-neutral mode, applying the synchronism check signal for live bus and live line volts above 40% of phase-to-neutral volts (provided phase angle settings, etc, are not exceeded) and allowing the relay to operate for dead bus volts below 15% of phase-to-neutral volts, irrespective of the synchronism between the line and bus volts.

9

1.3

Timer settings The timer setting is achieved using the slider switches in the lower left hand box on the relay nameplate. The feature is marked: t = ∑s indicating that the timer setting is the sum of settings on the slider switches marked 0.5s, 1s, 2s, 4s and 8s. The infinity setting is used when the phase comparison feature is not required. Example

t = ∑s 0 0 0 0 0 0

<— <— —> <— —> <—

∞

8 4 2 1 0.5

t = 4 + 1 = 5 seconds

The timer has an accuracy of ± 5% or ± 50ms of setting whichever is greater.

1.4 1.4

Unde Underv rvol olta tage ge bloc blocki king ng sett settin ing g (wh (when en fitt fitted ed – MAV MAVSS 01 01 onl only) y) The undervoltage blocking setting is achieved using the slider switches in the right hand box on the relay nameplate. This feature is marked: Vs = (77 + ∑)% Vn indicating that the undervoltage blocking setting is a fixed 77% of rated voltage plus any combination of the five slider switches labelled as % of rated voltage 0.5, 1, 2, 4 and 8, giving a setting range of 77% to 92.5% in 0.5% steps. The rated voltage can be phase-to-phase or phase-to-neutral and the bottom slider switch allows the customer to select the appropriate rated voltage. (Note that if V n(Ph) is selected the relay must be connected to phase-to-phase volts, and if V n ( ) is is sel selec ecte ted d the the rel relay ay must be connected to phase-to-neutral volts.) Example

Vs = (77 + ∑)% Vn 0.5 1 2 4 8 Vn ( )

—> —> <— <— —> <—

0 0 0 0 0 Vn (Ph)

Vs = (77 + 2 + 4)% V n ( )

Settings indicate that the undervoltage block feature is set to 83% of phase-to-neutral voltage. The relay will block at setting ± 5% of setting. If undervoltage settings in excess of  90% of rating are considered, it is important to appreciate that the blocking will be typically reset 2V above the actual blocking level for phase-neutral operation and 1V above the actual blocking level for phase-phase operation. This parameter is important if the system is expected to run nominally at less than rated voltage; the under voltage blocking setting should be chosen to ensure that the blocking is reset below the minimum operating voltage of the system.

10

1.5 1.5

Diff Differ eren enti tial al volt voltag agee blo block ckin ing g (wh (when en fitt fitted ed – MAV MAVSS 02 only only)) The differential voltage blocking setting is achieved using the slider switches in the right hand box on the relay nameplate. This feature is marked: Vs = ∑∆V% Vn indicating that the differential voltage blocking setting is the sum of any combination of the five slider switches, labelled as % of rated voltage 0.5, 1, 2, 4 and 8, giving a setting range of 0% to 15.5% of rated voltage in 0.5% steps. The rated voltage can be phase-to-phase or phase-to-neutral and the bottom slider switch allows the customer customer to select the appropriate appropriate rated voltage. voltage. (Note that if Vn (Ph) is selected the relay must must be connected connected to phase-to phase-to-phase -phase volts, volts, and and if Vn ( ) is is sel selec ecte ted d the the rela relayy must be connected to phase-to-neutral volts). Example

Vs = ∑∆V% Vn 0 0 0 0 0 Vn (Ph)

<— <— —> <— —> —>

0.5 1 2 4 8 Vn ( )

Vs = (2 + 8)% Vn ( )

Settings indicate that the differential voltage blocking feature is set to 10% of phaseto-neutral voltage. Over the setting range of 2% – 10%, the relay will block at setting ±  2% of rating. The 0.5% and 1.0% switch positions are designed to give the user a fine control over the differential voltage settings, and it is not recommended that these lowest settings are used in isolation. Resetting will occur within 2V (or 50%) of actual blocking whichever is greater.

1 .6

AC Auxiliary supply relays When an ac auxiliary supply relay is driven from the V BUS or VLINE ac voltage inputs, care must be taken in setting the relay. For example, if the ac auxiliary supply voltage is taken from the V BUS ac input to the relay, it must be appreciated that the live line/dead bus feature and undervoltage blocking feature (below 50V ac on the VBUS volts) will not operate since they go outside the low voltage limit (50V ac) of the ac auxiliary supply. Other features will operate as described in the publicity provided the ac auxiliary supply remains within its operating range (50 – 140V ac).

Section 2 2 .1

INSTALLATION

General Protective relays, although generally of robust construction, require careful treatment prior to installation and a wise selection of site. By observing a few simple rules the possibility of premature failure is eliminated and a high degree of performance can be expected. The relays are either despatched individually or as part of a panel/rack mounted assembly, in cartons specifically designed to protect them from damage. Care must be taken when unpacking and installing the relays so that none of the parts are damaged or their settings altered and they must at all times be handled by skilled persons only.

11

Carefully examine the module and case to see that no damage has occurred during transit. Check that the relay serial number on the module, case and cover are identical and that the model number and rating information are correct. Carefully remove any elastic bands/packing fitted for transportation purposes. Relays which have been removed from their cases should not be left in situations where they are exposed to dust or damp. This particularly applies to installations which are being carried out at the same time as constructional work.

2.2

Storage If relays are not installed immediately upon receipt they should be stored in a place free from dust and moisture in their original cartons and where de-humidifier bags have been included in the packing they should be retained. The action of the dehumidifier crystals will be impaired if the bag has been exposed to ambient conditions and may be restored by gently heating the bag for about an hour, prior to replacing it in the carton. Dust which collects on a carton may, on subsequent unpacking, find its way into the relay; In damp conditions the carton and packing may become impregnated with moisture and the de-humidifying agent will lose its efficiency. Storage temperature –25°C to +70°C

2.3

Site The installation should be clean, dry and reasonably free from dust and excessive vibration. The site should preferably be well illuminated to facilitate inspection. An outline diagram is normally supplied showing panel cut-outs and hole centres. For individually mounted relays these dimensions will also be found in the relevant publication. Publication R7012 is a parts catalogue and assembly instructions. This document will be useful when individual relays are to be assembled as a composite rack or panel mounted assembly.

Sec ecti tion on 3. CO COMM MMIS ISSI SIO ONING NING 3.1

Commissioning preliminaries

3.1. 3.1.1 1

Elec Electr tros osta tatiticc disc discha harg rges es (ESD (ESD)) The relay uses components which are sensitive to electrostatic discharges.When handling the module, care should be taken to avoid contact with components and electrical connections. When removed from the case for storage, the module should be placed in an electrically conducting anti-static bag. See full recommendations inside front cover.

3.1.2

Inspection Carefully examine the module and case to see that no damage has occurred during transit. Check that the relay serial number on the module, case and cover are identical, and that the model number and rating information are correct.

3.1.3

Wiring Check that the external wiring is correct to the relevant relay diagram or scheme diagram. The relay diagram number appears inside the case.

12

If test block type MMLG is provided, the connections should be checked to the scheme diagram, particularly that the supply connections are to the ‘live’ live’ side of the test block (coloured orange) and with terminals allocated with odd numbers (1, 3, 5, 7, etc). The auxiliary supply voltage to the scheme should be routed via test block terminals 13 and 15. 3.1.4

Earthing Ensure that the case earthing connection above the rear terminal block, is used to connect the relay to a local earth bar.

3.1.5

Insulation The relay, and its associated wiring, may be insulation tested between: – all electrically isolated circuits. – all circuits and earth. An electronic or brushless insulation tester should be used, having dc voltage not exceeding 1000V. Accessible terminals of the same circuit should first be strapped together. Deliberate circuit earthing links, removed for the tests, subsequently must be replaced.

3 .2

Test equipment required (basic) Two variable voltage ac supplies, one of which can be varied in phase angle relationship relative to the other. e.g. Phase-shifter, transformer and ‘variac’ variac’ transformers - see Fig. 1 or three ‘variac’ variac’ transformers - see Fig. 2 At least two multi-range voltmeters Interval timer 2 pole ON-OFF switch (for timing purposes) Phase angle indicator (volts to volts) or trigonometrical tables/electronic calculator.

3 .3

Preliminary re relay se settings The following initial settings are advised in order to restrict the inconvenience of the inhibition circuits within the relay.

3.3.1 3.3.1

Appli Applica cabl blee to to all all rela relays ys (MAV (MAVS S 01, 01, 02 and and 03) 03) Phase Angle Setting (see Section 1.1) - set to the desired application requirement. Dead Line/Live Bus (DL/LB, see Section 1.2) - set OUT Live Line/Dead Bus (LL/DB, see Section 1.2) - set OUT Vn(Ph)/Vn( ) - set set for Ph-Ph or Ph-N Ph-N connecti connection on as required required in the applicat application. ion. Timer setting (t = ∑s) - set all switches to 0 (instantaneous setting)

3.3. 3.3.2 2

Appl Applic icab able le to MAVS MAVS 01 rela relayy only only Undervoltage Blocking, Vs = (77 + ∑)% Vn : set all switches to the right ( ∑ = 0). Vs is now equal to 77%. Undervoltage Blocking, Vn( ) or Vn(Ph) : set to the Ph-Ph or Ph-N connection as required in the application, and the same as that selected in 3.3.1 above.

3.3. 3.3.3 3

Appl Applic icab able le to MAVS MAVS 02 rela relayy only only Differential Voltage Blocking, V s = ∑∆V% Vn : set all switches to the right ( ∑ =15.5%)

13

Differential Voltage Blocking, V n(Ph) or Vn( ) : set to the the Ph-Ph Ph-Ph or Ph-N Ph-N conn connect ection ion as required in the application and the same as that selected in 3.3.1 above. 3.4 3.4

Prel Prelim imin inar aryy pre prepa para ratition on for for rel relay ay seco second ndar aryy inj injec ectition on test testss

3.4. 3.4.1 1

Iso Isolate late the the wir wiriing from rom the the ‘BUS’ BUS’ and ‘LINE’ LINE’ VT’  VT’s from the relay (using MMLG test block, or other test facilities, if fitted).

3.4.2 3.4.2

Isolate Isolate as neces necessar saryy and and monit monitor or the the stat statee of the relay relay outp output ut cont contact acts. s. Two changeover contacts are provided on each relay, wired to the relay case terminals as follows Contacts

RL1/1

RL1/2

Normally open Normally closed

TMLS 1 & 3 TMLS 3 & 5

2&4 4&6

Check that with no LINE/BUS supplies to the relay, contact states are as above. 3.4.3 3.4.3

Connec Connectt the approp appropria riate te dc (or ac) ac) auxi auxilia liary ry suppl supplyy at relay relay rated rated volta voltage, ge, to to terminals 13 (+ve) and 14 (– (–ve) of the relay. The rated voltage is given on the relay nameplate as a dual rating, e.g. Vx = 110/125V, followed by a dc or ac symbol. Any voltage within the range may be accepted as the normal rated voltage.

3.5 3.5

Test Testss on on pha phase se angl anglee cal calib ibra rati tion on (MAV (MAVS S 01, 01, 02 & 03) 03)

3.5.1 3.5.1

Connec Connectt the approp appropria riate te ac suppli supplies es from from the the termin terminal al circ circuit uit (see (see Figs Figs 1 or 2) to the LINE VT and BUS VT INPUT terminals to the relay (terminals 27, 28 and 21, 22 respectively). The input circuits within the relay are isolated from each other, so ensure the common point of the two test supplies are taken to both terminal 28 and terminal 22.

3.5.2 3.5.2

Supply Supply the volt voltages ages on 27 and 21 21 with with the the rated rated Ph-N Ph-N or Ph-Ph Ph-Ph volta voltage ge (as (as select selected ed on the relay, in section 3.3.1) of 63.5/110V (50Hz relay) or 69.3/120V (60Hz relay). With these voltages IN-PHASE, (check no voltage exists between terminals 27 & 21), check that the output relay operates and the contacts change their state from that above and the ‘RELAY OPERATED’ OPERATED’ LED indication is given.

3.5.3 3.5.3

Make Make the LINE LINE VOLTS VOLTS (ter (termin minal al 27) 27) lead lead the BUS VOLT VOLTS S (termi (terminal nal 21) 21) until until the the relay relay just resets. This should occur at the selected ‘Relay Phase Angle Setting’ Setting’, with a tolerance of +0° –2° (or 0, –5%, whichever is the greater). A further tolerance of ± 2° should be allowed for site inaccuracies of phase angle measurement or calculation). Reduce the phase angle difference until the relay just picks-up. The pick-up angle should be within 10% of the reset angle.

3.5. 3.5.4 4

Repea Repeatt 3.5. 3.5.3 3 abov abovee for for term termin inal al 27 27 laggi lagging ng ter termi mina nall 21. 21.

3.6 3.6

Test Test on unde underr-vo voltltag agee blo block ckin ing g cal calib ibra rati tion on (MAV (MAVSS 01 01 onl only) y)

3.6.1 3.6.1

Set the underv undervolt oltage age select selection ion switch switches es to the desire desired d setti setting, ng, Vs. Vs = (77 + ∑)% Vn

3.6.2 3.6.2

With With both both suppli supplies es as in secti section on 3.5 3.5 IN-PHA IN-PHASE, SE, reduce reduce the the volt voltage age on on termin terminal al 27 until the ‘relay operated LED’ LED’ goes off. This should occur at ± 5% of the nominal undervoltage level. e.g. Undervoltage setting

=

(77 + 3)% = 80%

Ph-Ph selected, 80% of 110V Ph-N selected, 80% of of 63.5V

= =

88V, tolerance ± 4.4V 50.8V, tolerance ± 2.54V 14

Note: instrumentation errors should, if necessary, be taken into account. 3.6.3 3.6.3

Increa Increase se the the voltag voltagee until until the the relay relay just just operat operates es again again.. The meas measure ured d voltag voltagee should should be within +2.5V of that measured in 3.6.2 above.

3.6.4 3.6.4

Repeat Repeat 3.6.2 3.6.2 and and 3.6.3 3.6.3 for for a redu reducti ction on in in termin terminal al 21 voltage voltage,, with with termin terminal al 27 maintained at rated voltage Vn.

3.7 3.7

Diff Diffeerent rentia iall volt voltag agee bloc blocki king ng (MAVS MAVS02 02 only only))

3.7.1 3.7.1

Set the the diffe differen rentia tiall voltag voltagee blocki blocking ng select selection ion swit switche chess to the the desire desired d setting setting,, Vs. Vs = ∑∆V% Vn. Note: The relay relay measures measures the differenc differencee of voltage voltage magnitudes magnitudes and it is irrelevant irrelevant if  if  the voltage on terminal 27 is lowered or raised with respect to that on terminal 21 (or vice versa). The relay tolerance of ± 2%, expressed as a % of the rated voltage, is likely to be more accurate than any instrumentation available on site. To help overcome those difficulties, and the cumalative errors of two voltmeters, the following method is recommended:

3.7.2 3.7.2

Set both both supp supplie lies, s, as in in Sectio Sectionn 3.5 to to the rated rated volt voltage age (Ph-P (Ph-Phh or Ph-N, Ph-N, as as selecte selected). d).

3.7.3 3.7.3

Connec Connectt a voltm voltmete eterr across across term termina inals ls 27 and 21 21 and adjust adjust the test test circ circuit uit to give give the the IN-PHASE condition (Note: zero volts obtained on voltmeter).

3.7. 3.7.4 4

Redu Reduce ce any any one one supp supply ly unti untill the the ‘relay operated’ operated’ LED goes off. Note the differential voltage on the voltmeter. This should correspond to the differential voltage setting which is expressed on the relay as a percentage of the selected Ph-N or Ph-Ph rated voltage, with a tolerance of ± 2% of rating. e.g. Vs = ∑∆V% Vn See example in section 1.5 VS = (2 + 8)% VN = 10% VN If Vn (Ph  (Ph)) sele seleccted: ted:

V Diffe iffere renc ncee

= 10% 10% of 110V 110V (or (or 120V 120V if 60Hz 60Hz rela relayy) = 11V with a tolerance of ± 2.2V (50Hz) or 12V with a tolerance of ± 2.4V (60Hz)

If Vn ( ) selected:

V Difference

= 10% of of 63.5V (or 69.3V if 60Hz relay) = 6.35V, with a tolerance of ± 1.27V (50Hz) or 6.93V, with a tolerance of ± 1.39V (60Hz)

3.7.5 3.7.5

Increa Increase se the the lowere lowered d volta voltage ge until until itit operat operates es again again.. This This should should occur occur befor beforee the differential is reduced by more than 2.0V (or 50% of the actual differential, measured in 3.7.4 above, whichever is the greater).

3.8

Test Testss on on DL/ DL/LB LB and and LL/ LL/DB DB facil facilit itie iess aux auxililia iary ry supp supply ly rela relayy (al (alll rel relay ays) s) (See Section 1.2 for basic facilities) Set the switches to the application requirement and apply voltages to the LINE and BUS voltage inputs according to the relevant table below for the selected switch positions. Note that the relevant relay ‘operation’ operation’ or ‘no operation’ operation’ is given by noting the ‘relay operation LED’ LED ’ indicator. 15

3.8.1

MAVS 01 and MAVS 02 only DL/LB Switch LL/DB Switch Selected mode

In Out DL/LB

Out In LL/DB

Out Out –

No op No op No op No op

No op Operation No op Operation

No op No op No op No op

No op Operation No op Operation

No op No op No op No op

No op No op No op No op

In Out DL/LB

Out In LL/DB

Out Out –

Operation No op No op No op

Operation Operation No op Operation

Operation No op No op No op

Operation Operation No op Operation

Operation No op No op No op

Operation No op No op No op

Line volts Bus volts (Term (Termls ls 27/ 27/28) 28) (Ter (Terml mlss 21/2 21/22) 2) Rated V Ph-Ph or Ph-N

40% rated, in-phase 15% rated, in-phase 40% rated, anti-phase 15% rated, anti-phase

Bus volts Line volts (Term (Termls ls 21/ 21/22) 22) (Ter (Terml mlss 27/2 27/28) 8) Rated V Ph-Ph or Ph-N

40% rated, in-phase 15% rated, in-phase 40% rated, anti-phase 15% rated, anti-phase

See notes on table values, Section 3.8.3. 3.8.2

MAVS 03 only DL/LB Switch LL/DB Switch Selected mode Line volts Bus volts (Term (Termls ls 27/ 27/28) 28) (Ter (Terml mlss 21/2 21/22) 2) Rated V Ph-Ph or Ph-N

40% rated, in-phase 15% rated, in-phase 40% rated, anti-phase 15% rated, anti-phase

Bus volts Line volts (Term (Termls ls 21/ 21/22) 22) (Ter (Terml mlss 27/2 27/28) 8) Rated V Ph-Ph or Ph-N

40% rated, in-phase 15% rated, in-phase 40% rated, anti-phase 15% rated, anti-phase

See notes on table values, Section 3.8.3. 3.8.3

Notes on tables Where: 50Hz relay

Rated V = 40% rated = 15% rated =

60Hz relay

Ph-Ph Selected

Ph-N Selected

Ph-Ph Selected

Ph-N Selected

110V 44V 16.5V

63.5V 25.4V 9.53V

120V 48V 18V

69.3V 27.7V 10.4V

16

and: In-phase Anti-phase

3 .9

=

0° phase shift (nominally), or any phase angle within the relay operational limits

=

180° phase shift (nominally), or any phase angle beyond the relay operational limits.

Slip frequency timer (ts ) calibration tests To minimise the risk of a possible late closure, it is common practice to set the slip frequency timer setting, t s, to 10x the closure time of the breaker. In practice, therefore, for a closure initiation at the latest the  latest possible  time  time before the rotating vector exceeds the relay phase angle setting, actual closure will take place at a maximum phase angle of 1.2x the relay’ relay’s setting. The maximum slip frequency for which the relay will operate is given by the expression: f slip slip = f 1 – f 2 = 1 x θ  (Hz), where either f 1 or f 2 is at the nominal operating (50 or 60Hz) frequency ts 180 OR f slip slip  = 1 x θ x f reference reference , where either f 1 or f 2, the system frequency, is at a frequency other than nominal, but within the ts 180 fnominal   operative frequency range of the relay. where:

ts

= =

relay sset ettting an angle slip slip freq freque uenc ncyy tim timer er sett settin ing g

f reference reference f nominal nominal

= =

the refere reference nce freque frequency ncy of eith either er VBUS VBUS or VLIN VLINEE (Hz) (Hz) the the nomi nominal nal freq freque uenc ncyy of the the rel relay ay (50 (50 or or 60Hz) 60Hz)

θ

3.9.1 3.9.1

With With both both volta voltages ges of of the test test circui circuitt to the the BUS BUS and LINE LINE relay relay inpu inputs ts IN-P IN-PHAS HASEE (or as defined in section 3.8.3 as nominally in-phase) and both at nominal voltages (Ph-Ph or Ph-N), check that the ‘relay operated’ operated’ LED is on.

3.9.2 3.9.2

Arrange Arrange a pole pole of a double double pole pole on-o on-off ff switc switchh to isol isolate ate eith either er one one of two two suppl supplies ies to to the relay. Arrange the other pole to start an interval timer when the switch is closed. Connect a contact of the output relay, RL1, to stop the timer when the relay operates. (Contact terminals are given in Section 3.4.2).

3.9. 3.9.3 3

Set Set the the requ requir ired ed tim timee dela delayy sett settin ing g on the the rela relayy t = ∑s (seconds) as given in Section 1.3

3.9. 3.9.4 4

With With the the swit switch ch open open,, chec checkk the the ‘relay operate’ operate’ LED is off. Close the switch and note the relay operating time. This should be within ± 5% (or ± 50ms, whichever is the greater) of the set operating time, ts.

3.10 3.10

Disc Disco onnec nnecti tion on of test test supp supplilies es Remove all test supplies/test facilities and return the relay to its normal wired state.

3.11

System checks

3.11 3.11.1 .1 Auxi Auxililiar aryy supp supply ly Check that the rated dc (or ac) auxiliary supply voltage appears on terminals 13 and 14 of the relay. 3.11 3.11..2 VT phasing Correct phasing of the LINE and BUS VTs is essential. Adequate checks should be carried out to ensure that designated secondary windings correspond to the 17

appropriate primary phases. Similar phase to phase (or phase to neutral) connections must be chosen for the BUS and LINE VT inputs to the relay, with the lowest terminal number in each case (terminals 21 and 27 respectively) being of the same sense. This may be checked by the following methods, if practicable for the site application. Generator synchronising check applications - where it is possible to isolate the BUS section and associated VTs from the main system (i.e. DEAD BUS STATE): –

select the LL/DB ‘IN’ IN’ and DL/LB ‘out’ out’ switch position on the relay. With the generator running and producing rated voltage, close the associated circuit breaker to energise the BUS section. Check that rated voltage appears across terminals 21 and 22 of the relay, and similarly across terminals 27 and 28. Check that voltage between 21 and 27 is nominally zero, and that it is similarly zero across terminals 22 and 28 of the relay. Check also that rated voltage appears across 21 and 28 - if not it means that both VT secondary windings are fully isolated from each other. If the latter is the case, the above voltage checks should be repeated with a temporary link across terminals 22 and 28 to tie both outputs. (Note: It is common UK practice to earth each group of VTs, or CTs, at one point, therefore, both sets are effectively ‘tied’ tied’ together)

–

revert the LL/DB and DL/LB switches to their required state if different from the above.

Generator synchronising check applications - where it is not possible to obtain a dead bus condition, but where it is possible to isolate the generator windings (by link removal) from the associated VT’ VT ’s and circuit breaker: –

select the DL/LB ‘IN’ IN’ and LL/DB ‘OUT’ OUT’ switch position on the relay

–

remove the generator winding links and close the associated circuit breaker to energise the generator VT section. Check the voltages between the relay terminals as given in section (a) above

–

revert the LL/DB and DL/LB switches to their required state. Open the circuit breaker and replace the winding links.

Auto or system reclose check applications where either the LINE, or the BUS may be isolated to a ‘DEAD’ DEAD’ state: –

select the appropriate LL/DB or DL/LB setting on the relay. Close the associated circuit breaker to energise both the ‘LINE’ LINE’ and the ‘BUS’ BUS’ from the single source

–

check the voltages between the relay terminal as given in section (a) above

–

revert the LL/DB and DL/LB switches to their required state.

3.11 3.11.3 .3 Exter Externa nall cont contac actt wir wirin ing/ g/’’check’ check’ inhibition With the relay prevented from operating (temporarily isolate the auxiliary supply to terminals 13 or 14 of the relay) and under ‘safe’ safe’ closing conditions, check that the relay does in fact inhibit circuit breaker closure. Reinstate the auxiliary supply to the relay.

18

Relay terminals

R 3 phase 440V incoming supply

21

Y 250V

V1

B N

22

V3

N Link incoming neutral and outgoing yellow phase to produce a common voltage reference

B Y R 3 phase 440/110V phase shifter N B Y R

27 110V V2 28

Adjust V 1 and V2 to the required relay rated voltage (dependent on relay terminals used) using the two variacs. To check that V1 and V 2 are in phase, V 3 should be zero when V 1 = V2 both in voltage and phase relationship. This circuit can be used for all checks on a disconnected relay.

Figu Figure re 1 Phas Phasee shif shifte terr meth method od

19

METHOD 1 Using 3 single variacs or 1 single and 2 ganged variacs The ‘In-Phase’ In-Phase’ co  condition

At phase angle = relay angle Ø

A

A

A 440V 3Ph 4 wire supply

At max 120° angle of circuit.

VCOM.

VCOM.

N C B

C V3

V1

C

B

V2

VCOM.

N

N

V3

V1

V3

V2

V1

V1

V2

V2

Vectors Formed:

B V1

V2 V1 V2

V1 Leads V2

V1 Leads V2 120

°

V2

V1

V2

Method: 1) Reduce all variacs to min Ph-Nvolts. 2) Increase A phase variac to give relay rated volts on V1 and V2.

V2

V1

V1

1) Calculate V3 at relay phase angle Ø As for relay angle Ø for with V1 and V2 at rat rated ed rela relayy volt volts. s. any any ang angle le from from 0° to 120°. 1 V3 = 2 x rated volts x sine /2 Ø. 2) Set A phase variac to minimum. 3) Set B phase variac so V1 = V3 (calculated). (calculated). 4) Set C phase phase variac variac so V2 = V3 (= V1). 4) Increase Increase A phase variac variac such such that A V1 = V2 = relay rated volts. The relay should now be at its threshold of operation at Ø°. Increasing A phase variac should C B make the relay pick-up, decreasing Phase rotation of supply should make the relay reset. 5) Measu Measure re V1(= V2) for both pick-up and reset. Calculate Ø for each as follows: Sine 1/2 Ø = 1/2 V3 V2 Note Note:: Conn Connec ectt V1 to terminal 27 and V 2 to terminal 21 (common to terminals 28 and 22) for V line leads V bus. Connect V1 to terminal 21 and V 2 to terminal 27 (common to terminals 28 and 22) for V line lags V bus. METHOD 2

Using 1 variac rated at supply voltage ( ± 60° ph  phase shift) COM For V1 leads V2 use as shown. For V1 lags V2 use A-B volts for V2.

A

V1 C

B

METHOD 3

A

V2 V1

V2

C V1 V2

Disa Disadv dvan anta tage ge:: Ph-P Ph-Phh mus mustt be be sel selec ecte ted d on on rel relay ay.. Supply volts must equal relay rating.  pos. V1 collapses to 0.866 V2 at 30° po

Using variac rated at supply voltage (± 120° phase shift)

B

V2

V1 For V1 lag V2 use as shown. For V1 leads V2 connect variac A-C. COM

Disa Disadv dvan anta tage ge:: Ph-N Ph-N must must be sele select cted ed on rela relay. y. Supply volts must equal relay rating. V1 collapses to 0.5 V 2 at 60° pos.

Figur Figuree 2 Phase Phase-s -shi hift ft by Var Varia iacs cs

20

Section 4. MAINTENANCE Periodic maintenance is not necessary. However, periodic inspection and test is recommended. The following tests, referred to in Section 3, Commissioning are recommended. Relay type Description of test

Section ref.

MAVS 01 MAVS 02 MAVS 03

Test equip. required

3.2.2







Prelim. relay settings









–

–



– –

Prelim. preparation

3.3.1 3.3.2 3.3.3 3.4







Phase angle calibration

3.5







Under-voltage blocking

3.6



–

–

Differential V. blocking DL/LB, LL/DB facilities

3.7 3.8.1 3.8.2 3.8.3

–







– –

–

–









Slip frequency timer

3.9







Disconnection of of supplies

3.10







Sect Sectio ionn 5. PROB PROBLE LEM M ANAL ANALYS YSIS IS 5 .1

General The level of problem analysis provided here is restricted by the need to re-calibrate the relay when a major printed circuit board or voltage transformer is replaced. The recalibration procedure requires stable ac supplies with fine control and accurate phase angle adjustment and measurement. Since these facilities are unlikely to be available on site, it is recommended that the relay is returned to the factory if a problem occurs. In order to prevent the unnecessary return of a relay, the following procedure has been produced to establish basic relay performance.

5 .2

Procedure

5.2.1 5.2.1

The foll followi owing ng proce procedur duree assume assumess the relay relay has has been been remove removed d from from the the system system and and is available for energisation on an isolated dc supply with two ac voltage supplies of  rated frequency available. (Note - where an ac auxiliary relay is concerned, a third isolated voltage supply of rated voltage and frequency is required instead of the dc supply. One of the ac voltage supplies already available may be used provided it meets the power requirements of the relay and consideration is given to earthing arrangements when auxiliary equipment is connected to the relay).

5.2. 5.2.2 2

The The rela relayy set settiting ngss shou should ld be be as foll follow ows: s: Phase angle θ = 45° Slip frequency timer t s = 0

21

Dead line/live bus DL/LB OUT Live line/dead bus LL/DB OUT Undervoltage blocking Vs = 85%

Ph-N Ph-N (if fitted)

Differential voltage blocking V s = 10% Ph-N (if fitted) 5.2. 5.2.3 3

Apply Apply rate rated d dc dc vol volts ts to term termin inal alss 13( 13(+) +) and and 14( 14(––).

5.2.4 5.2.4

Apply Apply rate rated d ac voltag voltagee at rated rated freq frequen uency cy to term termina inals ls 21 21 and and 22. 22.

5.2.5 5.2.5

Apply Apply rated rated ac ac volta voltage ge at rated rated frequ frequenc encyy to term termina inals ls 27 and 28. 28. Ensu Ensure re the the two voltage inputs are in-phase.

5.2.6 5.2.6

The LED LED shou should ld come come ON and and the the outp output ut rela relayy shoul should d pickpick-up. up. Check Check with with a multimeter or digital voltmeter, set to measure resistance, that the normally-open contacts across terminals 1 and 3, and across terminals 2 and 4, are closed.

5.2. 5.2.7 7

Chan Change ge the the time timerr sett settin ing g (ts) to 10 seconds. Switch off one ac supply and then re-apply it. The relay should operate after a time delay (approximately 10 seconds).

5.2.8

Set the timer to zer zero.

5.2.9 5.2.9

Reverse Reverse the the connec connectio tions ns to term termina inals ls 21 and and 22. This This will will effect effective ively ly provi provide de two two ac voltages in direct anti-phase. The output relay should not operate and the LED should remain OFF.

Low voltage level detectors (all versions): Steps 5.2.10 to 5.2.14 establish operation of the dead line/live bus and live line/ dead bus features. 5.2.10 Switch IN the dead line/l line/live ive bus bus (DL/LB) (DL/LB) feature feature with phase-ne phase-neutral utral operation operation selected. 5.2.11 Reduce the ac input input voltage voltage to 10V across across terminals terminals 27, 27, 28. The The LED will will come come ON and the output relay will operate. Increase this voltage to 25V: the relay will reset and the LED will go OFF. 5.2.12 Switch OUT the DL/LB feature feature,, and switch switch IN IN the live live line/dead line/dead bus (LL/DB) (LL/DB) feature feature with phase-phase operation selected. 5.2.13 Return the ac voltage voltage across across terminals terminals 27, 28 to rated rated phase-phas phase-phasee voltage. voltage. Reduce the ac voltage across terminals 21, 22 to 16.5V. The relay will operate and the LED will come ON. Increase the ac voltage across 21, 22 to 44V, the relay will reset and the LED will go OFF. 5.2.14 Switch OUT the the LL/DB LL/DB feature feature and and return return the the voltage voltage across across 21, 21, 22 to rated rated phasephaseneutral voltage. For MAVS 01 Relays only: Steps 5.2.15 to 5.2.18 give a basic check of the undervoltage blocking option available on MAVS 01 only. 5.2.15 Repeat steps steps 5.2.3, 5.2.3, 5.2.4 5.2.4 and 5.2.5; the relay relay will operate operate and the the LED will will be ON. ON. 5.2.16 Reduce the ac voltage voltage across across terminals terminals 21, 22 to 52V for 50Hz 50Hz relays relays (57V (57V for for 60Hz relays) and check that the relay is blocked and the LED OFF. 5.2.17 Increase Increase the voltage voltage across across 21, 22 to 58V for for 50Hz relays (64V for for 60Hz 60Hz relays) relays) and check that the relay is operated and the LED ON. 5.2.18 Return the ac voltage voltage across across terminals terminals 21, 22 to rated rated phase-neu phase-neutral tral voltage voltage.. Repeat steps 2.18 and 2.19 for the ac voltage across terminals 27, 28. 22

5.2.19 5.2.20 5.2.21

5.2.22 5.2.23

5.3 5.3.1 5.3.1

5.3.2

5.3.3 5.3.3

5.3.4 5.3.4 5.3.5 5.3.5

5.3. 5.3.6 6

5.3.7 5.3.7

For MAVS 02 Relays only: Steps 5.2.19 to 5.2.23 give a basic check of the differential voltage blocking option available on MAVS 02 only. Note the ac supplies must be stable when checking a differential feature of this type. Repeat steps steps 5.2.3, 5.2.3, 5.2.4 5.2.4 and 5.2.5; the relay relay will will operate operate and the the LED will be ON. Reduce the ac voltage voltage across across terminals terminals 21, 22 to 55V for 50Hz 50Hz relays relays (60V (60V for for 60Hz relays). The relay will be blocked and the LED will go OFF. Increase Increase the voltage voltage across across 21, 22 to 62V for for 50Hz relays (68V for for 60Hz 60Hz relays) relays) and check that the relay is operated and the LED ON. Return the voltage to the rated phase-neutral value. Increase Increase the ac voltage voltage across across terminals terminals 27, 28 to 72V for 50Hz relays relays (78V for for 60Hz relays) and check that the relay is blocked and the LED OFF. Reduce the voltage voltage across across 27, 28 to 65V for 50Hz 50Hz relays relays (71V (71V for for 60Hz relays) relays) and check that the relay is operated and the LED ON. Return the voltage to the rated phase-neutral value. Replaceable parts The only only part of MAVS MAVS whic whichh can can be repl replaced aced without without recali recalibra bratio tionn is the the small small printed circuit board ZG0907 containing heat sink mounted power transistor TR1 and resistor resistor R1. This is fitted in the ventilated ventilated enclosure enclosure at the rear of the relay. relay. The following procedure will determine if a problem exists on this printed circuit board. Access is required within the relay and it may be necessary to remove the fixing screws to the main printed circuit board(s). (Note - PCB ZG0907 is not used on 30/ 34V dc relays).  WARNING: DANGEROUS DC VOLTAGES ARE ARE PRESENT WITHIN THE RELAY RELAY AND IN PARTICULAR ON THE REAR HEAT SINK MOUNTED TRANSISTOR TR1. Whenever inspecting or disassembling the relay or adding/removing probes, ALL SUPPLIES TO THE RELAY MUST BE REMOVED. In order order to to preve prevent nt damage damage to the the relay relay,, if prin printed ted circ circuit uit boards boards have have been been taken taken off  their mountings, ensure they do not short to other parts of the relay. In particular, the screening plates mounted between the main printed circuit boards and the relay case are connected to 0V. Inspect Inspect prin printed ted circu circuitit boards boards for for signs signs of damage, damage, over overhea heatin ting, g, open-c open-circ ircuit uit wiri wiring ng to loop and bead connections, taking care not to stress any of the wiring joints. If there there are are no obviou obviouss signs signs of damage, damage, connec connectt a digita digitall voltm voltmete eter, r, set set to read read dc dc volts, across loop and bead connectors 5(+) and 6( –) on printed circuit board ZJ0055. Apply Apply rat rated ed aux auxililia iary ry vol volts ts acr acros osss termi terminal nalss 13(+ 13(+)) and and 14(– 14(–). The digital voltmeter should read rated auxiliary volts. If no voltage reading is obtained, remove the auxiliary supply, and check the wiring: Terminal 13 to loop & bead connector 5 (ZJ0055) Terminal 14 to loop & bead connector 6 (ZJ0055) Connec Connectt the the digit digital al volt voltmet meter er acro across ss loop loop and bead connec connector torss J(+) J(+) and and H( H(–) on printed circuit board ZJ0055. The voltmeter should read a dc voltage just below the input voltage on terminals 13 and 14. If no volts are measured, overheating should be evident on printed circuit board ZJ0055.

23

5.3.8 5.3.8

5.3.9 5.3.9

Connec Connectt the the digit digital al volt voltmet meter er acro across ss loop loop and bead connec connector torss L(+) L(+) and and H( H(–) on printed circuit board ZJ0055. A reading should be obtained as follows: 39V dc for 48/54V dc relay 47V dc for other auxiliary ratings. If no volts are obtained, again evidence of overheating should be visible. If printed circuit board ZJ0055 shows no such signs, printed circuit board ZG0907 is suspect. Remove the auxiliary supply and check the wiring: PCB ZJ0055 PCB ZG0907 Loop/bead connector J to Loop/bead connector C Loop/bead connector K to Loop/bead co connector B Loop/bead connector L to Loop/bead connector E Note that the components on ZG0907 are power components designed to dissipate heat under normal operation. Any problem in this area is likely to cause overheating which should be obvious. If the the operat operator or is is convin convinced ced of of a probl problem em on printe printed d circu circuitit boar board d ZG0907, ZG0907, the whole rear-mounted assembly can be removed by: (i) removin removing g the wires wires to loop loop and and bead bead connec connector torss J, K and L on prin printed ted circu circuitit board ZJ0055. (ii) removing removing the the four four fixing fixing screws screws to the black black plastic plastic rear mountin mounting. g. It is important to quote the serial number and model number of the relay if a replacement part is required.

Section 6. REPAIRS Should the need arise for the equipment to be returned to ALSTOM T&D Protection & Control Ltd for repair, then the form at the back of this manual should be completed and sent with the equipment together with a copy of any commissioning test results.

24

   )    4

  s    t    t   u   c   a   p   t    t   u   n   o    O  c

     x   e        V    t

  o    N   e   e    S    (

   t   x   e    R    3    4    1    1

   1

3

5

   2

   1    /    1    L    R

4

6

   2    /    1    L    R

  s   r   l    t   e  y   i   u   w  p   c   p  r   o  u    i    P  s   c

   1    L    2    R

   t

    f   e    R

  r   o    t   c   e    t   e    d    l   e   v   e    L

   k   c   o    l    B

   B    L    /    L    D   e   g   a  s   r    t    l   o    t   o   c   v   e   r   t   e  e    d    d   n    U

     u        V

   1   =

   B    D    /    L    L

   &

&

     u        V

     u        V

     u        V

  e   g   a   s   r    t    l   o   o   t   c   v   e   r    t   e   e    d   d   n    U

   B

   A

  n   o    i    t   a    t   o   r   e   s   a    h    P    C

   A    B    C

   7    8    2    2

   1    2    2    2

  s    t    l   o   v   e   n    i    L

  s    t    l   o   v   s   u    B

   )    h    2    t   r   e   a   t   e   o   e   N   s   a   e   e    C   (   s

  c

   C

   B

   b

   B

   b

   A

  a

   A

  a

   C

N   n

N   n

 .    t   c   e   n   n   o   c   s    i    d    )   c    (    d   n   a    )    b    (   e   r   o     f   e    b   e    k   a   m   s    k   n    i    l   g   n    i    t   r   o    h   s    T    C

  c

  :    )   s   e    (   a    t   o  .    N    1

 .   y    l   n  .   o    )    l   c    (   a   c   e    i   r   p   o   y  .     f    t   y   e    l   e    b   n   r    k   a  .   o   a   y   c   n    l   e   n    d   r   w   o    V    b   o  .    h    l    0   s   s    l   s   a    5   a    l   c    2   a   s    i   n   n    i    i   a   p    /   y    0   m   s    t   m   r   r   n   e   e   o   e    2    t    2    t    i    t   r   r    t   r   g   c   a   o   o   n   e   s     f    h   o   n   n   o    d   n    i    S    L   e   o    t   r   c   c    i   e   g   n   u   q   n   n   e    i   o   r    h    t   c    t   x    )    )   r   a    T   e    b   c    (    (    E    V    R  .  .  .    2    3    4

   C    B    A

   h    t   r    2   a   e   e   s   a    1    C

4

6

   4    1

   2    2

   8    2

3

5

   3    1

   1    2

   7    2

   k   c   o   r    l    b   a   e    l   r   a   n   m    i   o   r   m     f   r   e   d    t   e   e    l   u   w   e    d   i   o   v    M

Figure Figure 3 Applicatio Applicationn Diagram: Diagram: check check synchronisi synchronising ng relay relay with under under voltage voltage blocking blocking – Type MAVS 01

25

   )    4

  s    t    t   u   c   a   p   t    t   u   n   o    O  c

     x   e        V    t

  o    N   e   e    S    (

   t   x   e    R    3    4    1    1

   1

3

5

   2

   1    /    1    L    R

4

6

   2    /    1    L    R

  s   r   l    t   e  y   i   u   w  p   c   p  r   o  u    i    P  s   c

   1    L    2    R

   t

    f   e    R

  r   o    t   c   e    t   e    d    l   e   v   e    L

   k   c   o    l    B

   B    L    /    L    D

   B    D    /    L    L

   &

  e   g   a    t    l   o   s   r   v   o    l    t   a   c    i   e    t    t   n   e   e   d   r   e     f     f    i    D

   1   =

     u        V

     u        V

&

  e   g   a   s   r    t    l   o   o   t   c   v   e   r    t   e   e    d   d   n    U

 .    t   c   e   n   n   o   c   s    i    d    )   c    (

   B

   A

  n   o    i    t   a    t   o   r   e   s   a    h    P    C

   A    B    C

   7    8    2    2

   1    2    2    2

  s    t    l   o   v   e   n    i    L

  s    t    l   o   v   s   u    B

   )    h    2    t   r   e   a   t   e   o   e   N   s   a   e   e    C   (   s

  c

   C

   B

   b

   B

   b

   A

  a

   A

  a

   C

N   n

N   n

   d   n   a    )    b    (   e   r   o     f   e    b   e    k   a   m   s    k   n    i    l   g   n    i    t   r   o    h   s    T    C

  c

  :   s    )   e    (   a    t   o  .    N    1

 .   y    l   n  .   o    )    l   c    (   a   c   e    i   r   p   o   y  .     f    t   y   e    l   e    b   n   r   o    k   a  .   a   y   c   n    l   e   n    d   r   w   o    V    b   o  .    h    l    0   s   s    l   s   a    5   a    l   c    2   a   s    i   n   n    i   p    /    i   a   y   m   m   s    t    0   r   r   n   e    2   e   e    i   o    t    t    2    t   r   r    t   r   g   c   a   o   o   n   e   s     f    h   o   n   n   o    d   n    i    S    L   e   o    t   r   c   c    i   e   g   n   u   q   n   e    i   n   o   r    h    t   c    t   x    )    )   r    T   e   a    b   c    E    V    R    (    (  .  .  .    2    3    4

   C    B    A

   h    t   r    2   a   e   e   s   a    1    C

4

6

   4    1

   2    2

   8    2

3

5

   3    1

   1    2

   7    2

   k   c   o   r    l    b   a   e    l   r   a   n   m    i   o   r   m     f   r   e   d    t   e   e   w    l   u   e    d   i   o   v    M

Figure 4 Application Application Diagram: Diagram: check check synchronising synchronising relay relay with differenti differential al voltage blocking blocking – Type MAVS 02

26

   )    4

  s    t    t   u   c   a   p   t    t   u   n   o    O  c

     x   e        V    t

  o    N   e   e    S    (

   t   x   e    R    3    4    1    1

   1

3

5

   2

   1    /    1    L    R

4

6

   2    /    1    L    R

  s   r   l    t   e  y   i   u   w  p   c   p  r   o  u    i    P  s   c

   1    L    2    R

   t

    f   e    R

  r   o    t   c   e    t   e    d    l   e   v   e    L

   k   c   o    l    B

   B    L    /    L    D

   B    D    /    L    L

   &

&

   1   =

     u        V

     u        V

  e   g   a   s   r    t    l   o   o   t   c   v   r    t   e   e   e    d   d   n    U

   B

   A

  n   o    i    t   a    t   o   r   e   s   a    h    P    C

   A    B    C

   7    8    2    2

   1    2    2    2

  s    t    l   o   v   e   n    i    L

  s    t    l   o   v   s   u    B

   )    h    2    t   r   e   a   t   e   o   e   N   s   e   a   e    C   (   s

  c

   C

   B

   b

   B

   b

   A

  a

   A

  a

   C

N   n

N   n

 .    t   c   e   n   n   o   c   s    i    d    )   c    (    d   n   a    )    b    (   e   r   o     f   e    b   e    k   a   m   s    k   n    i    l   g   n    i    t   r   o    h   s    T    C

  c

  :   s    )   e    (   a    t   o  .    N    1

 .   y    l   n  .   o    )    l   c    (   a   c   e    i   r   p   o   y  .     f    t   y   e    l   e    b   n   r    k   a  .   o   a   y   c   n    l   e   n    d   r   w   o    V    b   o  .    h    l    0   s   s    l   s   a    5   a    l   c    2   a   s    i   n   n    i   p    /    i   a   y   m   m   s    t    0   r   r   n   e    2   e   e    i   o    t    t    2    t   r   r    t   r   g   c   a   o   o   n   e   s     f    h   o   n   n   o    d   n    i    S    L   e   o    t   r   c   c    i   e   g   n   u   q   n   n   e    i   o   r    h    t   c    t   x    )    )   r   a    T   e    b   c    E    (    (    V    R  .  .  .    2    3    4

   C    B    A

   h    t   r    2   a   e   e   s   a    1    C

4

6

   4    1

   2    2

   8    2

3

5

   3    1

   1    2

   7    2

Figure 5 Application Application Diagram: Diagram: check check synchronisi synchronising ng relay relay – Type MAVS 03

27

   k   c   o   r    l    b   a   e    l   r   a   n   m    i   o   r   m     f   r   e   d    t   e   e    l   w   u   e    d   i   o   v    M

28

Sect Sectio ionn 7. CO COMM MMIS ISSI SION ONIN ING G TEST TEST RECO RECORD RD Site

Location

Model No.

Diagram

Serial No.

Volts dc

Volts Ph

Hz

Volts N

Hz

Calibration of phase angle Angular limits (degrees) Phase angle setting (degrees)

Lead LED off

La g LED on

5 7.5 10 15 25 45 82.5 Slip frequency timer Setting

Operating time (secs)

0 0.5 1.0 2.0 4.0 8.0 15.5 Infinity

Check >30 secs.

Dead line/live bus and live line/dead bus features DL/LB

LED on Vn (E.F.) LED LED off off Vn (E.F (E.F.) .) LED on Vn (Ph) LED LED off Vn (Ph)

LL/ LL/DB

LED on Vn (E.F.) LED LED off off Vn (E.F (E.F.) .) LED on Vn (Ph) LED LED off Vn (Ph) 29

LED off

LED on

Undervoltage blocking (MAVS 01 only) VB Setting

LED off

VL LED on

LED off

LED on

*Ph – N 77% Ph – Ph  Ph 77.5% 78% 79% 81% 85% 92.5%

Voltage differential blocking (MAVS 02 only) VB Setting *Ph – N

LED off

VL LED on

LED off

LED on

0.5%

Ph – Ph 1.0% 2.0% 4.0% 8.0% 10.0%

* Delete as appropriate ____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ Commissioning Engineer

____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __ Customer Witness

____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ Date

____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __ Date 30

REPAIR REPAIR FORM F ORM Please complete this form and return it to ALSTOM T&D Protection & Control Ltd with the equipment to be repaired. This form may also be used in the case of application queries.

ALSTOM T&D Protection & Control Ltd St. Leonards Works Stafford ST17 4LX, England For:

After Sa Sales Se Service De Department

Customer Ref: ___________________________

Model No: __________________

Contract Ref:

___________________________

Serial No:

Date:

___________________________

1.

__________________

What paramet parameters ers were were in in use at the the time time the fault fault occur occurred red?? AC volts

_____________ Main VT/Test set

DC volts

_____________ Battery/Power supply

AC curr curren entt

____ ______ ____ _______ ____ Main Main CT/Te T/Test st set set

Frequency

_____________

2.

Which Which type type of of test test was being being used? used? ___ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ _____ __

3.

Were all the extern external al compon components ents fitted fitted where where requir required? ed? (Delete as appropriate.)

Yes/No Yes/No

4. List List the the rela relayy set settitings ngs being being used used ____________________________________ ________________________________________________________ _______________________________________ _____________________ ____________________________________ ________________________________________________________ _______________________________________ _____________________ ____________________________________ ________________________________________________________ _______________________________________ _____________________ 5. What What did did you you exp expec ectt to happ happen en?? ____________________________________ ________________________________________________________ _______________________________________ _____________________ ____________________________________ ________________________________________________________ _______________________________________ _____________________ ____________________________________ ________________________________________________________ _______________________________________ _____________________ ____________________________________ ________________________________________________________ _______________________________________ _____________________ continued overleaf 

31

    ✁

6.

What did happen? en? _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________

7. When When did did the the faul faultt occu occur? r? Instant

Yes/No

Intermittent

Yes/No

Time delayed

Yes/No

(Delete as appropriate).

By how long?

___________

8. What What ind indic icat atio ions ns ifif any any did did the the rela relayy show show?? _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ 9. Was Was the there re any any vis visua uall dam damag age? e? _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ 10. Any other other remarks remarks which may be be useful: useful: _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________ _____________________________________ ________________________________________________________ _______________________________________ ____________________

______ ___ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ _____ __ Signature

______ ___ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ___ Title

______ ___ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ _____ __ Name (in capitals)

______ ___ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ___ Company name 32

    ✁

33

34

35

 A L S T O M T & D P r o t e c t i o n & C o n t r o l L t d St Leonards Works, Stafford, ST17 4LX Engla England nd Tel: 44 (0) 1785 223251 Fax: 44 (0) 1785 212232 Email: [email protected] m.co.uk Internet: www.gecalsthomgpc.co.uk www.gecalsthomgpc.co.uk ©1998 ALSTOM T&D Protection & Control Ltd Our policy is one of continuous product development development and the right is reserved to supply equipment which may vary from that described.

Publication R8045E

Printed in England.