Answer Posted / vinodh.t

fallowing protection are used for alternator
1.differential
2.negative phase sequence
3.over voltage
4.over current
5.thermal overload
6.under frequency
7.earth fault
8.over fluxing
9.over frequency,etc
feeder protection
1.over current
2.earth fault
transmission protection
1.over current
2.earth fault

Explain the working of variable frequency transformer?

1155

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We have 750KVA DG set, we want to introduce REF relay with 1250/1A,CL PS,Current transformers.The lead distance of 2.5mm copper flexible cable from CT to relay is around 5mtrs.We would like to know the knee point votage(VK) & IM calculion for CT's

1922

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why constant voltage transformer should be start without load? and if started then what will happen?

2045

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any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?

2143

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How to calculate the no of Ceiling fan (1200mm sweep) per unit area?

2079

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I want to design a heating coil of 80/20 nicrome for 3.5KW please give me the calculations choosing for physical dimensions assume coil voltage will be 110V AC assume necessary conditions

1611

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errection check list for transformer maintenance

2604

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1.4 What is meant by CT knee point voltage and how would you determine it

1687

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can anyone explain 11kV 3core cable megger,hi pot test procedure with connection details?

3274

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Define newton's law of viscosity.

1213

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write down the formula of cable size in RM if current is 50Amp.

1341

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iam preparing for rrb section engineer post in electrical branch.suggest the right textbook for my reference.fromwhere i will get the previous q.papers?

2280

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induction 3 phase motor terminal connection

2670

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Whether amorphous core transformer is available in India?.If available then up to what rating of voltage and KVA?.

1738

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which protection used in power plant?

1958

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