What is meant by locking of rotor in synchronous motor? Explain me locking in detail?

3 Answers  

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why we are used thermistor in motor

1 Answers  

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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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resitance in ac=1.6*resistance in dc

3 Answers  

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In DC while we mention the voltage we are using -48V but in case of AC we mention only 230V not -230V, why we using -48V not 48V

2 Answers  

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My switchgear busbar is rated at 2000A and just imagine the actual load on busbar is 1000A. From that busbar there are 10 outgoing feeders. Now the question is will the load be 1000A on each outgoing feeder or 100A per outgoing feeder. 2nd thing how do i calculate the load on individual feeder. Thanks for your time. Please provide some clarification on this issue.

1 Answers   Alstom,

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protection used for alternator , feeder , transmission line

3 Answers   NHPC, Perfetti,

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what is pole slip ?

4 Answers   NTPC,

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What about Reactive power.and role of that one?

7 Answers  

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how we can check that any motor is faulty may be single phase or three phase?

2 Answers   MAHINDRA,

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how much load 15kva dg set can bear

7 Answers  

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can anyone explain the star-delta motor control wiring ,which wire go where and how they operate?

0 Answers  

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