why star point of motor shall not be grounded?

8 Answers  

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why we use 110vac in overhead crains? why not 220v, 24v

3 Answers   SOFT,

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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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what is the difference between the 94 lockout relay and 86 lock out relay. I have noticed that the 94 lockout relay is activated when the distance realy is activated and 86 is activated when the 87T differential is activated. but why can't the same lockouts be used for both the protection schemes

10 Answers   ABB,

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In three phase supply why we use R Y B Colour not other.

4 Answers  

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How stabilizer works

1 Answers  

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why can't we increase the voltage by increasing the field voltage in order to get higher voltage.so that we can eliminate step up transformer

4 Answers   Bhel,

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What happen to generator if i have unbalanced load?

0 Answers   Reliance Energy, Sail, TCS,

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What is the name of oil which is used in transformer?

3 Answers  

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Explain the operation of variable frequency transformer?

0 Answers  

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Wat is the best to use in a generator a 6.5kva or a 7 kw

4 Answers  

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why induction motor takes high current?

1 Answers   Emerson,

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