GE MVAX 11, Technical Manual

Page 1: ...GE Grid Solutions MVAX 11 12 21 31 91 Technical Manual Trip Circuit Supervision Relay Publication reference R8010RB ...

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Page 3: ...SAFETY SECTION ...

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Page 5: ...ondition It is assumed that everyone who will be associated with the equipment will be familiar with the contents of this Safety Section or the Safety Guide SFTY 4L M When electrical equipment is in operation dangerous voltages will be present in certain parts of the equipment Failure to observe warning notices incorrect use or improper use may endanger personnel and equipment and also cause perso...

Page 6: ...r the manuals cannot cover all conceivable circumstances or include detailed information on all topics In the event of questions or specific problems do not take any action without proper authorization Contact the appropriate General Electric technical sales office and request the necessary information ...

Page 7: ...tion Caution risk of electric shock Protective Conductor Earth terminal Functional Protective Conductor Earth terminal Note This symbol may also be used for a Protective Conductor Earth terminal if that terminal is part of a terminal block or sub assembly e g power supply NOTE THE TERM EARTH USED THROUGHOUT THIS TECHNICAL MANUAL IS THE DIRECT EQUIVALENT OF THE NORTH AMERICAN TERM GROUND 3 2 Labels...

Page 8: ...e device General Electric strongly recommends that these contacts are hardwired into the substation s automation system for alarm purposes To ensure that wires are correctly terminated the correct crimp terminal and tool for the wire size should be used The equipment must be connected in accordance with the appropriate connection diagram Protection Class I Equipment Before energizing the equipment...

Page 9: ...current rating of external wiring applicable to the application Accidental touching of exposed terminals If working in an area of restricted space such as a cubicle where there is a risk of electric shock due to accidental touching of terminals which do not comply with IP20 rating then a suitable protective barrier should be provided Equipment use If the equipment is used in a manner not specified...

Page 10: ...ries are fitted they should be replaced with the recommended type and be installed with the correct polarity to avoid possible damage to the equipment buildings and persons 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 be...

Page 11: ...Service Manual R8010RB MVAX Page 1 24 TYPE MVAX TRIP CIRCUIT SUPERVISION RELAY ...

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Page 13: ...7 4 MVAX 31 MVAX 91 3 separate MVAX 31 s in a size 8 case 9 2 7 5 MVAX 31 04 only 10 2 7 6 MVAX 31 with CCT breaker closure inhibit contact 11 3 MAINTENANCE 13 4 MECHANICAL SETTINGS 13 4 1 General 13 4 1 1 With the armature closed the clearance between the back of the armature and the back stop should be 0 075 0 2mm 0 003 0 008 13 4 1 2 Nominal armature gap open 13 4 2 Contact settings 14 4 2 1 MV...

Page 14: ...m trip supervision relay 16 Figure 2 Supervision of interposing control relay type MVAW 17 Figure 3 Supervision of tripping relay type MVAJ 17 Figure 4 Circuit diagram MVAX21 trip circuit supervision relay without preclosing supervision 18 Figure 5 Application diagram MVAX21 trip circuit supervision relay without preclosing supervision 19 Figure 6 Circuit diagram MVAX31 trip circuit supervision re...

Page 15: ...which are being carried out at the same time as constructional work 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 de humidifier crystals will be impaired if the bag has been exposed to ambient ...

Page 16: ...release On units fitted with hand reset flag indicators check that the flag is free to fall before or just as any make contacts close Replace the module in the case and refit the cover Make sure that the reset mechanism in the cover is correctly located with respect to the relay element and that the flag or mechanism can be reset 2 2 Wiring Check that ratings of the relay agree with the supplies t...

Page 17: ...is within those figures stated in the same column Repeat again only using terminals 27 28 Rated voltage range V 30 34 48 54 110 125 120 250 Test voltage V 30 48 110 220 Terminals 21 27 46 1 56 3mA 24 1 29 5mA 11 13 4mA 11 4 14mA Terminals 27 28 46 1 56 3mA 24 1 29 5mA 11 13 4mA 11 4 14mA 2 7 2 MVAX 12 only Isolate the relay from the trip supply batteries by removing fuses links as necessary Using ...

Page 18: ...rm supply voltages immediately prior to the tests and note Test 1 With the circuit breaker open check that no voltage appears across terminals 13 and 14 of the relay Check that the voltage appearing across terminals 21 and 28 comply with that given in Table 1 alarm supply and that the front relay RL1 has operated Reset its flag Test 2 With the circuit breaker closed check that the front relay rema...

Page 19: ...e of the relay The same voltage limits apply Both these voltages are derived from the trip supply Check the voltage across terminals 27 and 28 ve of the relay This should be within the limits given in Table 2 for the alarm supply Note that the front relay unit RL1 is picked up and reset its flag Test 3 With the circuit breaker closed check that the front relay RL1 remains operated Check that no vo...

Page 20: ... For other voltages within the relays normal voltage rating range tolerance bands for other measured supply voltages should be altered pro rata A Table Table 1 of acceptable tolerance for the test is given Measure the trip supply and alarm supply voltages immediately prior to tests and note Test 1 With the circuit breakers open check that no voltage appears across terminals 13 and 14 21 and 22 of ...

Page 21: ...limits apply Both these voltages are derived from the trip supply Check the voltage across terminals 27 and 28 ve of the relay This should be within the limits given in Table 3 for the alarm supply Note that the front relay unit RL1 is picked up and reset its flag Test 3 With the circuit breaker closed check that the front relay RL1 remains operated Check that no voltage appears across terminals 2...

Page 22: ...ed on drop off to prevent mal operation during the transition period Relay V rating 110 125 Ref V for tolerance 125 Hand reset flag 25 8 31 6V Test 1 Trip supply Self reset flag 25 8 31 6V Hand reset flag 31 3 38 8V Test 2 Alarm supply Self reset flag 38 46 6V Hand reset flag 51 6 63 1V Test 3 Trip supply Self reset flag 51 6 63 1V Hand reset flag 7400 Test 4 Self reset flag 7400 Table 3 MVAX31 wi...

Page 23: ...s In general contact gaps and follow through are defined by quoting an armature gap at which the tips should be just closed or just open The relay contact state is always defined with the relay in the unenergised position unless otherwise specified on the appropriate circuit diagram Symbol used on diagrams Contact Type Normal duty Make Normally open M Break Normally closed B 4 1 1 With the armatur...

Page 24: ... break contacts 1 75 2mm 0 07 0 08 Note On MVAX 21 31 Relays To measure the force to just close or the force to just break on the lower right hand contact when viewed from the front of the module it is necessary to carefully lift the upper moving contact blade to remove the pressure on the lower contact 4 2 3 MVAX 21 Unit RL2 MVAX 31 Units RL2 and RL3 With the armature closed onto a 0 25mm 0 011 f...

Page 25: ...cts not changing state Pushrod not in position Check output terminals with reference to diagram Contamination of contacts MVAX 21 31 91 Units RL2 RL3 contacts not closing 5 3 Reset time on MVAX 12 too short Check capacitor C1 is not open circuit or short circuit Contacts should be cleaned with the burnishing tool supplied in relay tool kits On no account should knives files or abrasive materials b...

Page 26: ...rear Note 1 a b c Short terminals break before c Long terminals CT shorting links make before b and c disconnect Case earth Combinations of output contacts Output contacts to module terminals 1 3 2 4 M M M B B B 2M 2M 1M 1B 2B Contact descriptions M B Make Break Figure 1 Circuit and application diagram trip supply supervision relay ...

Page 27: ...rposing control relay 1 3 2 4 MVAX 11 Supervisory relay P1077ENa Figure 2 Supervision of interposing control relay type MVAW R2 R1 Protective relay contact 27 28 21 MVAJ Tripping relay 1 3 2 4 MVAX 11 Supervision relay P1078ENa Figure 3 Supervision of tripping relay type MVAJ ...

Page 28: ... 1 a b c Short terminals break before c Long terminals CT shorting links make before b and c disconnect 7 8 9 10 1 12 Case earth 3M Combinations of output contacts Output contacts to module terminals 1 3 5 7 M M B 2M 1B 1M 2B B 3B 2 4 M B B M M M B B V x V x Contact descriptions M B Make Break P1079ENa Figure 4 Circuit diagram MVAX21 trip circuit supervision relay without preclosing supervision ...

Page 29: ...ip coil 27 28 R EXT 1 RL1 3 52 b C B aux switch Trip coil 21 RL2 1 Trip supply Vx 2 Alarm supply Vx 1 1 RL1 1 4 2 RL1 2 7 5 RL1 3 Note Contact arrangement shown is typical only Alarm contacts P1080ENa Figure 5 Application diagram MVAX21 trip circuit supervision relay without preclosing supervision ...

Page 30: ...R8010RB Service Manual Page 20 24 MVAX P4066ENa Figure 6 Circuit diagram MVAX31 trip circuit supervision relay with preclosing supervision ...

Page 31: ...Service Manual R8010RB MVAX Page 21 24 P4067ENa Figure 7 Application diagram MVAX31 trip circuit supervision relay with preclosing supervision ...

Page 32: ...R8010RB Service Manual Page 22 24 MVAX P4068ENa ...

Page 33: ...x2 V REXT2 ohms Alarm Vx1 V REXT1 ohms MVAX 31 91 Trip Vx2 V REXT2 3 ohms Commissioning preliminaries Tick if satisfactory Insulation tests Satisfactory Not required Test results MVAX 11 relay Test 2 7 1 Resistance across terminals 21 27 Ω 27 28 Ω Trip supply voltage V CB open Relay stable CB closed Relay stable Trip circuit open Relay operates Contacts checked Test results MVAX 12 relay Test 2 7 ...

Page 34: ... Volts across terminals 13 and 14 V 3 tick 4 tick Test results MVAX 31 relay Test 2 7 4 Measured trip supply V alarm supply V 1 and 2 CB open Volts across terminals 13 and 14 V 21 and 22 V 27 and 28 V 3 CB closed 21 2 V 13 and 14 V 4 CB closed Resistance between 14 and 22 ohms 5 tick 6 tick Note For details of the above tests see Publication R8010 Comments Commissioning Engineer Customer Witness D...

Page 35: ...iled during service Yes How long 2 SPECIALIST REPAIR INSTRUCTIONS Do you want an updated firmware version after repair Yes No Is the relay being returned in a case Yes No If No see repair Term 5 3 CUSTOMS INVOICING INFORMATION REQUIRED TO ALLOW RETURN OF REPAIREDITEMS Value for Customs M Customer Invoice Address if paid M Customer Return Delivery Address full street address M Part Shipment Accepte...

Page 36: ...e box should be used with packing material at the bottom the device placed into box with sufficient gaps to fill with packing material around each side and on the top extra packaging material placed around therelay 4 Please include a copy of the completed RMA form then close the lid and seal with packaging tape 5 The relay should then be secondary packed if being exported the primary packed box sh...

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Page 38: ...n this document is indicative only No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project This will depend on the technical and commercial circumstances It is provided without liability and is subject to change without notice Reproduction use or disclosure to third parties without express written authority is strictly pr...