Answer / satya dev

For Alternator..... Over Voltage & Under Voltage Relay,
Over current & Earth fault relay but all these are not
directlay connected to alternator, It is connected to the
ACB of alternator to safe the Same during faults.


For Transformer...... Buckholz Relay, Winding temperature
Indication(Alarm & tripping system) Oil temp. Indcation etc.

Answer / taju

For Alternator- Under/over voltage protection,Reverse
power,under/over frequency,ground fault protection,

For TXR-Buckholz rely,winding temperatur,Oil
temperature,ground fault protection.

If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree.

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what methods are used to improve power factor?

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what current is taken from a double wound 500kva transformer

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if we use a normal natural thundering; than approx how much amount of electricity we generate?

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megger generates D.C. voltage while earth tester generates A.C.voltage is it true? I know for megger it is D.C generator but what about earth tester?

4 Answers   IOCL,

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