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Type MVAG

Instantaneous Under and

Over Voltage Relays

Service Manual

R8049D

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Summary of Contents for MVAG

Page 1: ...Type MVAG Instantaneous Under and Over Voltage Relays Service Manual R8049D ...

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Page 3: ...s of the printed circuit board Avoid touching the electronic components printed circuit track or connectors 3 Do not pass the module to any person without first ensuring that you are both at the same electrostatic potential Shaking hands achieves equipotential 4 Place the module on an antistatic surface or on a conducting surface which is at the same potential as yourself 5 Store or transport the ...

Page 4: ...10 2 1 General 10 2 2 Electrostatic discharges 10 2 3 Wiring 10 2 4 Commissioning preliminaries 10 2 5 Insulation 11 2 6 Wiring 11 2 6 1 Relay types 11 3 MAINTENANCE 12 4 MECHANICAL SETTINGS 12 4 1 Contact setting 12 4 2 MVAG relays 12 4 3 Mechanical flag settings 13 4 3 1 Hand reset flag 13 5 PROBLEM ANALYSIS 13 5 1 General 13 5 2 Failure to operate reset 13 5 3 Failure of output contacts to chan...

Page 5: ...ING 3 3 EQUIPMENT OPERATING CONDITIONS 4 3 1 Current transformer circuits 4 3 2 External resistors 4 3 3 Battery replacement 4 3 4 Insulation and dielectric strength testing 4 3 5 Insertion of modules and pcb cards 4 3 6 Fibre optic communication 5 4 OLDER PRODUCTS 5 5 DECOMMISSIONING AND DISPOSAL 5 6 TECHNICAL SPECIFICATIONS 6 ...

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Page 7: ... 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 e g power supply NOTE THE TERM EARTH USED THROUGHOUT THE PRODUCT DOCUMENTATION IS THE DIRECT EQUIVALENT OF THE NORTH AMERICAN TERM GROUND 2 INSTALLING COMMISSIONING AND SERVICING Equipment connections Personnel undertaking installation commissioning ...

Page 8: ...rotection Remove insulating strip from battery compartment 3 EQUIPMENT OPERATING CONDITIONS The equipment should be operated within the specified electrical and environmental limits 3 1 Current transformer circuits Do not open the secondary circuit of a live CT since the high level voltage produced may be lethal to personnel and could damage insulation 3 2 External resistors Where external resisto...

Page 9: ...e inserted or withdrawn from the equipment whilst it is energised This is to avoid possible shock or damage hazards Hazardous live voltages may be accessible on the extender card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 5 DECOMMISSIONING AND DISPOSAL ...

Page 10: ...gory Overvoltage IEC 601010 1 1990 A2 1995 Category III EN 61010 1 2001 Category III Distribution level fixed insulation Equipment in this category is qualification tested at 5kV peak 1 2 50µs 500Ω 0 5J between all supply circuits and earth and also between independent circuits Environment IEC 601010 1 1990 A2 1995 Pollution degree 2 EN 61010 1 2001 Pollution degree 2 Compliance is demonstrated by...

Page 11: ...oved from their cases should not be left in situations where they are exposed to dust or damp This is particularly applies to installations which are being carried out at the same time as construction work 1 3 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 inc...

Page 12: ...diagram number appears inside the case 2 4 Commissioning preliminaries To gain access to the relay first loosen the captive cover screw and carefully remove the cover from the case The module can then be removed from the case by grasping the handles at the top and bottom of the front plate and pulling forwards Care must be taken to ensure that mechanical settings of the element are not disturbed C...

Page 13: ...Vx to terminals 13 and 14 MVAG 12 32 14 34 16 36 18 38 On all types apply measuring supply Vn to the appropriate relay terminals and check pick up values 2 6 1 Relay types MVAG 11 31 12 32 15 35 and 16 36 have fixed settings MVAG 13 33 14 34 17 37 and 18 38 have adjustable settings Operate levels for all types should be within 5 of their set values Reset levels vary with type MVAG 11 31 U V nomina...

Page 14: ...th the relay in the unenergised position unless otherwise specified on the appropriate circuit diagram Contact type Symbol used on diagrams Normal duty Make M normally open Break B normally closed With the armature closed the clearance between the back of the armature and the back stop should be 0 003 0 008 Nominal armature gap open 0 050 0 060 for all types 4 1 Contact setting MVAA relays used as...

Page 15: ...lags can be fitted to all relays however the flag is fitted to the measuring element for the following types MVAG 11 31 13 33 15 35 and 17 37 and to the following MVAA element on the following types MVAG 12 32 14 34 16 36 and 18 38 4 3 1 Hand reset flag With the armature closed onto a 0 018 feeler gauge the flag should be free to fall but should not fall using a 0 013 feeler gauge Adjustment is ma...

Page 16: ...row on the knob with the lowest setting Tighten screw and refit plastic value Note The switch used is a 12 position switch and can therefore be rotated past the highest setting In the unmarked positions the relay is set to its highest setting value Check switch setting if appropriate Check values and correct connection of any external series resistors Check mechanical settings as per Section 4 Sec...

Page 17: ... 27 V n Note 1 a CT shorting links make before b and c disconnect b Short terminals break before c c Long terminals 1 2 3 4 5 6 13 14 21 22 27 28 Case earth Module terminal block viewed from rear Combinations of Output contacts to output contacts module terminals 1 3 2 4 2M M M 1M 1B M B Contact description M Make B Break ZJ0075 ...

Page 18: ...ed from front 10 12 RL2 1 R3 R2 2 9 10 8 C1 28 D3 D4 D1 D2 RVD1 V n RL1 A R1 7 27 A Front mounted facing front viewed from front 1 3 2 5 4 7 6 9 8 11 RL1 5 Rext R4 5 3 6 4 14 D7 D8 D5 D6 RVD2 13 V x 1 2 3 4 5 6 7 8 9 10 11 12 13 14 21 22 27 28 Case earth Module terminal block viewed from rear RL2 A A Front unit RL1 Combinations of Output contacts to output contacts module terminals 1 3 5 7 9 11 2 ...

Page 19: ... M M 1M 1B M B Contact description M Make B Break Viewed from front RL1 2 D2 D4 D1 D3 RVD1 5 C1 6 R8 7 R7 6 R6 5 R5 4 R4 3 R3 2 R1 1 S1 13 1 2 V n 27 28 1 2 3 4 5 6 13 14 21 22 27 28 Case earth Module terminal block viewed from rear Note 1 a CT shorting links make before b and c disconnect b Short terminals break before c c Long terminals ZJ0071 ...

Page 20: ... ZG0878 Part board 7 8 RL1 A R BK W 2 1 4 3 6 5 8 7 10 12 Front mounted facing front viewed from front RL1 5 RL2 A A A Rear unit RL2 Combinations of Output contacts to output contacts module terminals 9 11 1M M Contact description M Make B Break Front unit RL1 Combinations of Output contacts to output contacts module terminals 1 3 5 7 2 4 6 8 10 12 5M M M M M M 4M 1B M M B M M 3M 2B B M B M M 2M 3...

Page 21: ...27 V n Note 1 a CT shorting links make before b and c disconnect b Short terminals break before c c Long terminals 1 2 3 4 5 6 13 14 21 22 27 28 Case earth Module terminal block viewed from rear Combinations of Output contacts to output contacts module terminals 1 3 2 4 2M M M 1M 1B M B Contact description M Make B Break ZJ0075 ...

Page 22: ... viewed from front 10 12 RL2 1 R3 R2 2 9 10 8 C1 28 D3 D4 D1 D2 RVD1 RL1 A R1 7 27 A Front mounted facing front viewed from front 1 3 2 5 4 7 6 9 8 11 RL1 5 5 3 6 4 14 D7 D8 D5 D6 RVD2 13 V x 1 2 3 4 5 6 7 8 9 10 11 12 13 14 21 22 27 28 Case earth Module terminal block viewed from rear RL2 A A Front unit RL1 Combinations of Output contacts to output contacts module terminals 1 3 5 7 9 11 2 4 6 8 5...

Page 23: ... 1M 1B M B Contact description M Make B Break Viewed from front RL1 2 D2 D4 D1 D3 RVD1 5 C1 6 R8 7 R7 6 R6 5 R5 4 R4 3 R3 2 R1 1 S1 13 1 2 V n 27 28 1 2 3 4 5 6 13 14 21 22 27 28 Case earth Module terminal block viewed from rear Note 1 a CT shorting links make before b and c disconnect b Short terminals break before c c Long terminals ZJ0071 Rext R2 ...

Page 24: ...L1 A R BK W 2 1 4 3 6 5 8 7 10 12 Front mounted facing front viewed from front RL1 5 RL2 A A A Rear unit RL2 Combinations of Output contacts to output contacts module terminals 9 11 1M M 1B B Contact description M Make B Break Front unit RL1 Combinations of Output contacts to output contacts module terminals 1 3 5 7 2 4 6 8 10 12 5M M M M M M 4M 1B M M B M M 3M 2B B M B M M 2M 3B B M B B M 1M 4B B...

Page 25: ...minals break before c c Long terminals Note 2 When break contacts are used on RLA RLB RLC they are wired in series across terminals 2 and 4 Front mounted facing front viewed from front 2 1 4 3 RLA 2 R1 1 2 8 C1A 24 D4A D3A D2A D1A RVD1A 23 V n ZJ0075 Par t board 7 ZG0878 Par t board Front mounted facing front viewed from front 2 1 4 3 RLB 2 R2 3 4 1 C1B 26 D4B D3B D2B D1B RVD1B 25 V n ZJ0075 Par t...

Page 26: ... board ZJ00 73 Part board ZJ00 73 RLB X RLA X 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Case earth Module terminal block viewed from rear Rear unit RLA RLB RLC Combinations of Output contacts to output contacts module terminals 16 18 1M M 1B B Contact description M Make B Break Front unit RL1 Combinations of Output contacts to output contacts module terminals 1 3 5...

Page 27: ... viewed from front RLB 2 D2B D4B D1B D3B RVD1B 9 C1B 1 R8B 7 R7B 6 R6B 5 R5B 4 R4B 3 R3B 2 R1B 1 SB 13 3 4 V n B 25 26 R4 R3 R2B Board 1 ZG0878 2 1 4 3 Front mounted facing front viewed from front RLC 2 D2C D4C D1C D3C RVD1C 11 C1C 12 R8C 7 R7C 6 R6C 5 R5C 4 R4C 3 R3C 2 R1C 1 SC 13 5 6 V n C 27 28 R2 R1 R2C Board 2 ZG0878 1 2 3 4 5 6 13 14 17 18 19 20 21 22 23 24 25 26 27 28 Case earth Module term...

Page 28: ...r mounted facing rear viewed from front RLB 1 RL1 Y D2B D4B D1B D3B RVD1B 9 C1B 10 R8B 7 R7B 6 R6B 5 R5B 4 R4B 3 R3B 2 R1B 1 SB 13 3 4 V n B 25 26 R4 R3 R2B Board 1 ZG0878 V n C 16 18 Rear mounted facing rear viewed from front RLC 1 RL1 Z D2C D4C D1C D3C RVD1C 11 C1C 12 R8C 7 R7C 6 R6C 5 R5C 4 R4C 3 R3C 2 R1C 1 SC 13 5 6 27 28 R2 R1 R2C Board 2 ZG0878 X Y Z Left hand 2 1 4 3 6 5 8 7 Right hand Fro...

Page 29: ... they are wired in series across terminals 2 and 4 1 2 3 4 5 6 13 14 21 22 27 28 Case earth Module terminal block viewed from rear 23 24 25 26 17 18 19 20 2 1 4 3 Front mounted facing front viewed from front RLA 2 R2A 1 2 8 C1A 24 D3A D4A D1A D2A RVD1A 23 V n ZJ0075 Par t board 7 R1A 2 1 4 3 Front mounted facing front viewed from front RLB 2 R2B 3 4 1 C1B 26 D3B D4B D1B D2B RVD1B 25 V n ZJ0075 Par...

Page 30: ... 8 9 11 5M M M M M M 4M 1B M M B M M 3M 2B B M B M M 2M 3B B M B B M 1M 4B B B B B M 5B B B B B B R3B 26 25 V n B 16 18 Rear mounted facing rear viewed from front RLB 2 19 20 C1B D4B D3B D2B D1B RVD1B R1B 13 RL1 Y 3 4 14 X Part board ZJ00 73 R2B R3C 28 27 V n C 16 18 Rear mounted facing rear viewed from front RLC 2 17 18 C1C D4C D3C D2C D1C RVD1C R1C 11 RL1 Z 1 2 12 X Part board ZJ00 73 R2C 14 13 ...

Page 31: ...viewed from front RLB 2 D2B D4B D1B D3B RVD1B 9 C1B 1 R8B 7 R7B 6 R6B 5 R5B 4 R4B 3 R3B 2 R1B 1 SB 13 3 4 V n B 25 26 R2B 2 1 4 3 Front mounted facing front viewed from front RLC 2 D2C D4C D1C D3C RVD1C 11 C1C 12 R8C 7 R7C 6 R6C 5 R5C 4 R4C 3 R3C 2 R1C 1 SC 13 5 6 V n C 27 28 R2C R2 Par t board ZG0878 R3 Par t board ZG0878 1 2 3 4 5 6 13 14 17 18 19 20 21 22 23 24 25 26 27 28 Case earth Module ter...

Page 32: ...ng rear viewed from front RLB 1 RL1 Y D2B D4B D1B D3B RVD1B 9 C1B 10 R8B 7 R7B 6 R6B 5 R5B 4 R4B 3 R3B 2 R1B 1 S1 13 3 4 25 26 R2B 16 18 Rear mounted facing rear viewed from front RLC 1 RL1 Z D2C D4C D1C D3C RVD1C 11 C1C 12 R8C 7 R7C 6 R6C 5 R5C 4 R4C 3 R3C 2 R1C 1 S1 13 5 6 27 28 R2C X Y Z Left hand 2 1 4 3 6 5 8 7 Right hand Front mounted facing front viewed from front RLA X RLB X RLC X RL1 5 13...

Page 33: ...cuit Serial No Rating Diagram No Model No 3 Case earthing 4 Remove packing pieces Contact follow through Check flag s 6 DC supply polarity 4 Relay voltage Vx A B C Vs 5 Relay setting Vs Check operation at Vn Check over undervoltage volts Check reset volts Commissioning Engineer Customer Witness Date Date ...

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Page 35: ...ct Ref ___________________ Serial No ___________________ Date ___________________ 1 What parameters were in use at the time the fault occurred AC Volts ___________________ Main VT Test set DC Volts ___________________ Battery Power supply AC current ___________________ Main CT Test set Frequency ___________________ 2 Which type of test was being used 3 Were all the external components fitted where...

Page 36: ... No Intermittent Yes No Time delayed Yes No Delete as appropriate By how long ___________________ 8 What indications if any did the relay show 9 Was there any visual damage 10 Any other remarks which may be useful Signature Title Name in capitals Company name ...

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Page 38: ...AREVA T D s Automation Information Systems Business www areva td com T D Worldwide Contact Centre online 24 hours a day 44 0 1785 25 00 70 http www areva td com contactcentre Publication R8049D ...

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