what is international rules of electrical?

5 Answers   Essar,

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how much GROUND & NEUTRAL VOLT maintain in data center.

0 Answers  

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what are the analog quality input for protection function?what are minimum reqiments?

0 Answers  

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what happen if we give 220 volts dc supply to d bulb r tube light?

9 Answers   NHPC,

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C.S.R. and where are they use in electrical systems

1 Answers  

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is it possible to minimize the copper loss?

2 Answers   Coal India, TATA,

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how is control wiring coding is done in a CRP panel ?

0 Answers   Genus, Havells, Hindustan Power Projects,

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What is the basic principal of Diesel genarator?

3 Answers   Juniper Networks, MRF,

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What is the permissible sound level for 1000kva DG set and how the sound level is calculated.

1 Answers  

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Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

1 Answers  

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what is interference

1 Answers   L&T,

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why don't we use the generator as a motor? and what will happen?

0 Answers  

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