why make protection 85% of winding?

1 Answers  

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what is the effect of earth on capacitance in 3-phase and 1- phase transmission line?

0 Answers  

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why and how fault current flows through ground?

1 Answers  

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What is the use of iron core in a transformer?

0 Answers  

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how can we measure 220kv or more than these voltages ...?and also how can we conform whether we r getting 220kv from generating stations throuth the h v transmission lines?

1 Answers  

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as per BIS supply voltage in India is ......

9 Answers  

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What can a fresh(without experience) electrical engineer contribute to NTPC( Or any PSU company) growth?

3 Answers   NTPC,

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We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

2 Answers   KPTCL,

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Different between megger and contact resistance meter

3 Answers  

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I need HT sphere gap calibration table. Can any body help me.

0 Answers  

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Why not connect relay Y phase for over current and earth fault

1 Answers   HB,

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what is specific gravity of a battery if specific gravity increase/decrease,what will happen to the voltage/current of the battery

5 Answers   NTPC,

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