Why wind turbines wheels rotate constantly

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My system is 22kv/3.3kv transformer. client is asking to use NGR, but as we have dedicated Neutral Earthing systems which has a value less than 1 Ohm. So i want solid comparision. Why i should not use NGR as my system is already protected.Can any one help me to get out of this.how should i reply on basis of some great comparision and calculations. Please help

2 Answers   Ariel,

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As we know that during saturation test of CT from secondary side, the current in secondary shoots up after core saturation. How core saturation effects the secondary current?

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can anybody sent me power grid questions. what subject should i prefer for preparation?

0 Answers   Reliance, Vascon,

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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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What is Form factor?

2 Answers   NTPC,

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What are dcs and plc?

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What is IGBT?Where it is used? What is the difference between IGBT and Thyristor?

5 Answers   AC, Formo Plastic, HBL Power Systems, SECL,

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If single phase supply is 220v. then why three phase supply is 660?

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how does the power is travelled in conductor

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How Many safety of Air circuit breaker

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what is the difference b/w KVA and KW? the transformer are mentioned KVA rating and the loads are mentioned KW.why?

2 Answers  

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