Answer / c r satpathy

The trip circuit supervision relay is used for supervising important control circuits such as circuit-breaker
and disconnector control circuits and signalling circuits in power electrical installations. Generally one supervision relay is needed per circuit to be supervised. If several branches of a circuit are to be supervised, the required
number of relays can be connected to the same control circuit. Continuous monitoring of circuit-breaker trip circuits and other essential control circuits. Preset operate time preventing unwanted alarm signals at circuit-breaker operation

in power station what is the electrical circuit length of spacing between power transformer and lightning arrestors,for the voltage system of 230kv,110kv,33kv,22kv,11kv?

1 Answers  

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why overload relay is not tripped at time of starting of motor allthough staring current is too high?

5 Answers   TATA,

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How can one connect three source of electricity in a house..the source are 2 gen and one electricity.

2 Answers   SAUDI ARABIAN BAYTUR, Wantro Technical Services,

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what is the meaning for va and how it is generated

1 Answers  

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the max. power will be transferred if …… a) sending end vol. is high b) receiving end v is high c)…….. d) corona loss is least

2 Answers   Engineers India Limited,

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if we have a industrial load of 400 kilowatts with 415 volt AC then how much total harmonic distortion (thd%) should be acceptable for steady power system.

0 Answers  

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What are the advantages of using distance protection schemes as opposed to normal overcurrent/ earth fault protection on high voltage feeders.

0 Answers   Eskom,

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what is the voltage of insulation megger that should be used for measuring the resitance of 66kv equipments.

3 Answers   DEWA,

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what is zero sequence curr ent ?

4 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 LINIER MOTOR?

4 Answers   BSNL, wbsedcl,

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what kinds of Transformer oil grade is better for power transformer ?

0 Answers   KSRM Steel Plant,

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