Areva MCAG 19 Service Manual
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Areva MCAG 19 Service Manual

Areva MCAG 19 Service Manual

Protective relays
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Types MCAG 19, 39
Protective Relays
Service Manual
R8035F

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Summary of Contents for Areva MCAG 19

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

  • Page 3: Table Of Contents

    CONTENTS INSTALLATION General Unpacking Storage Site COMMISSIONING General Electrostatic discharges Wiring Commissioning preliminaries Insulation Earthing Main current transformers Equipment required Electrical tests 2.10 Output Contacts MAINTENANCE MECHANICAL SETTINGS General Contact setting Mechanical flag setting PROBLEM ANALYSIS Failure to operate Operating at the incorrect values Output contacts 5.3.1 Output contacts not operating mechanically...

  • Page 4: Installation

    Section 1. INSTALLATION General Protective relays, although generally of robust construction, require careful treatment prior to installation. 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.

  • Page 5: Commissioning

    Publication R6001 is a leaflet on the modular integrated drawout system. Publication R6014 is a list recommended suppliers for the pre-insulated connectors. Section 2. COMMISSIONING General Before leaving the factory all relays are accurately adjusted, tested and carefully packed. Hence there should be no need for any re-adjustment on commissioning. Moving parts are held in position during transit by rubber bands and packing.

  • Page 6: Insulation

    Insulation The relay and its associated wiring, may be insulation tested between: a) all electrically isolated circuits b) all circuits and earth An electronic or brushless insulation tester should be used, having a dc voltage not exceeding 1000V. Accessible terminals of the same circuit should first be strapped together.

  • Page 7: Output Contacts

    2.10 Output Contacts Check that the output contacts close or open as appropriate. Replace the cover and ensure that the cover reset mechanism will reset the mechanical flag. Connect the relay to the system as shown in the application diagram. Replacing any links, wiring, fuses and remove any ct short circuits used during commissioning.

  • Page 8: Contact Setting

    Contact setting Normal duty make and break contacts. With the armature closed onto a 0.012" feeler gauge the make contact should be closed, but should be open using a 0.015" feeler gauge. Force to just close the make contacts 18/23 grams. Make contact gap 0.070"/0.080".

  • Page 9: Operating At The Incorrect Values

    Operating at the incorrect values Check plug settings, and xI settings. Check knob on xI , the dot on the potentiometer skirt should be in line with the setting mark when the potentiometer os rotated fully anticlockwise. Check mechanical settings-see Section 4. Check values and adjustment of potentiometer, this can be damaged if overloads are left on too long.

  • Page 10: Commissioning Test Record

    Section 7. COMMISSIONING TEST RECORD Type MCAG Current Relay Single and Three Phase Site ______________________________ Circuit ____________________________ Model No. _________________________ Serial No. __________________________ Rating: ___________________________ Aux ______________________________ Diagram __________________________ Setting ____________________________ Pick up check Phase Setting Operate current Delete if not applicable Check reset (drop off) is >80% of Is __________ Check flag indicator...
  • Page 11 Page 10...

  • Page 12: Repair Form

    REPAIR FORM Please complete this form and return it to GEC ALSTHOM T&D Protection & Control Limited with the equipment to be repaired. This form may also be used in the case of application queries. GEC ALSTHOM T&D Protection & Control Limited St.
  • Page 13 What did happen? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ When did the fault occur? Instant Yes/No Intermittent Yes/No Time delayed Yes/No (Delete as appropriate). By how long? __________ What indications if any did the relay show? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ Was there any visual damage? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________...
  • 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/...

This manual is also suitable for:

Mcag 39

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