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  1. 040358

    VT pressure test

    You can test VT by two methods: A. HV test: 1. Short all the primary terminals together including nuetral (remove the neutral from the ground). 2.Short all the secondary terminals and ground. 3. As per IEC, for 24kV rated equipment, power frequency withstand voltage is 50kV. 4. Apply 75% of 50kV...
  2. 040358

    Capacitor Bank Hazards

    What protections you have applied for capacitor banks? Generally following are used for capacitor bank protections. 1. Bank overcurrent protection a) Using bank fuses or b) Using O/C relays 2. Over-voltage protection 3. Unbalance protection Capacitor bank protection equipment must guard against...
  3. 040358

    Capacitor Bank Hazards

    What protections you have applied for capacitor banks? Generally following are used for capacitor bank protections. 1. Bank overcurrent protection a) Using bank fuses or b) Using O/C relays 2. Over-voltage protection 3. Unbalance protection Capacitor bank protection equipment must guard against...
  4. 040358

    Buccholz Relay

    There are three velosity settings in buchholz relay. The normal velosity setting is 1 m/s. The most senitive setting is 0.75 m/s and least sensitive setting is 1.5 m/s. Your setting is OK. If the buchholz didn't reset then you have to release the air through the small valve from where you...
  5. 040358

    Tests for VT

    Generally magnetizing curve is plotted on logarithmic scale
  6. 040358

    The art and science of protective relaying

    The book was printed by General Electric Company in 1956 in USA.Liberary of Congress Catalog Card Number is 56-8694. Please check at www.geindustrial.com/pm/notes/artsci/ Regards,

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