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Types MCAG 19, 39

Protective Relays

Service Manual

R8035F

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Summary of Contents for MCAG 19

Page 1: ...Types MCAG 19 39 Protective Relays Service Manual R8035F ...

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Page 3: ...g 5 2 7 Main current transformers 5 2 8 Equipment required 5 2 9 Electrical tests 5 2 10 Output Contacts 6 3 MAINTENANCE 6 4 MECHANICAL SETTINGS 6 4 1 General 6 4 2 Contact setting 7 4 3 Mechanical flag setting 7 5 PROBLEM ANALYSIS 7 5 1 Failure to operate 7 5 2 Operating at the incorrect values 8 5 3 Output contacts 8 5 3 1 Output contacts not operating mechanically 8 6 SPARES 8 7 COMMISSIONING T...

Page 4: ...ave been removed form 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 h...

Page 5: ...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 6: ...y circuit of a live ct since the high voltage produced may be lethal to personnel and could damage insulation 2 8 Equipment required A current source capable of supplying sinusoidal current at the appropriate test current levels An ammeter with the appropriate current range 2 9 Electrical tests Set the plug bridge to its lowest value Set xIs potentiometer to 1 Slowly raise the current until the re...

Page 7: ... be checked as per Section 4 and if any adjustment is made then Section 2 should be repeated Section 4 MECHANICAL SETTINGS 4 1 General Armature gap measurements should be made with the top of the feeler gauge level with the centre line of the core Contact pressures are measured with gramme gauge at the contact tips In general contact gaps and follow through are defined by quoting an armature gap a...

Page 8: ...ch is located between the contact blades near to the contact blocks Contact settings for Normal duty make and break short hand reset contacts 4 3 Mechanical flag setting With the armature closed onto a 0 015 feeler gauge the flag should be free to fall but should not fall using a 0 020 feeler gauge Adjustment is made to the catch spring on the flag Section 5 PROBLEM ANALYSIS 5 1 Failure to operate...

Page 9: ...lock and relay contacts Contacts contaminated these should be cleaned with a burnishing tool supplied in relay tool kits On on account should knifes files or abrasive materials be used Check mechanical settings as per Section 4 5 3 1 Output contacts not operating mechanically Push rods not correctly located Check electrical connections Flag spring may be distorted holding the armature open Section...

Page 10: ...________________ Diagram __________________________ Setting ____________________________ 1 Pick up check Phase Setting Operate current A B C Delete if not applicable 1 1 Check reset drop off is 80 of Is __________ 2 Check flag indicator __________ 3 Check contact operation __________ 4 Remarks ___________________________________ ____________________________________ Commissioning Engineer Customer ...

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Page 12: ... 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 required Yes No Delete as appropriate 4 List the relay settings being used ______________________________________________________________________ _________________________________________...

Page 13: ...________________________________ ______________________________________________________________________ 9 Was there any visual damage ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ 10 Any other remarks which may be useful ____________...

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Page 16: ...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 R8035F ...

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