Answer / ganeshyeole

1. phase over curtent27.
2. earth fault 27b.
3. unbalance46.
4. 48 locked rotter.
5. start per hour.
6. thermal overload49.
etc.

Answer / kannan

make > schnider electric
MICOM 220 Motor production relay

The capacity of the transformer is 20/25 MVA, Ratio is 132/11 KV, Vactor group YNyno. and impedance is 10.07%. As per the calculation the secondary current is 1312.2Amps. The maximum fault current the transformer should sustain is 13.030KA. How many times the transformer should sustain the maximum short circuit current of 13.030KA over a period up 1 Year. The transformer is repaired one & 10 Years old.

1 Answers  

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why motor run slow speed in star connection?explain how?

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what is the reason of capacitor failure in alternator which is working with 10 kva dgset

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Differentiate between ideal and non ideal current sources?

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How can you limit the fault level in a power system?

1 Answers   Alfanar,

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What is tan delta & PPM in transformer? and whats its IS value?

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how many types in CT & define it ?

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why transformer does not obey ohm law?

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Which is stiffer between salient pole rotor and cylindrical rotor synchronous machines? Justify your answer.

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Why is the diffrential protection in DG. What if the CT polarity is reversed while connecting for the same type of protection? How polarity can be made ok?

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In 90 kva alternator that produce the output voltage is 115(p-n),200(p-p) at 1500 rpms means what ampere it produced ?

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