what is the function of supervison relay?Draw its wiring diagram.

2 Answers   IBM, R.R. ISPAT LIMITED,

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check list of maintenance of transformer?

11 Answers   ABC, Cosmos, EPRON, Essar, Godrej, Hescom, Infosys, KPTCL, TCS,

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directional over current relay when acted & how it works

3 Answers   NCC, ThyssenKrupp,

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Dear Sirs, I am a technical persons.In one of our Electrical Sub- Station, We have installed three numbers of 1250KVA ,11KV/0.415KV Transformer to feed the Factory load. We have found some abnormality. In one of our Transformers the leakeage current from transformer body to earth through earth continuity wire is almost 86 Amp but in other transformer it is (5-10)Amp. where the load current on three phase and neutral are respectively 1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical person help me about the reasons of this situation and how I can rectify the fault. Moreover,I have measured the earth resistance of the Earth continuity wire which is less than 1 Ohm. Thanks Tapas Barua

3 Answers  

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explain different losses in a transformer.

0 Answers  

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how to calculate the size of the HT cable

0 Answers  

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what the effect will occur if we increase the airgap in induction motor

4 Answers   IES, Tanfac,

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what are the basic insulation levels & what its Unit

0 Answers  

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Why the transformers are rated in KVA. ? in new view.

2 Answers  

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My load is 1635 KW. & current pf is 0.884, I have to improve it for 0.99.Please suggest what KVAR value is needed?

0 Answers  

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where they are using surge arrester and lighting arrester? how they connect? what is the purpose of that?

1 Answers  

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Why you want to join non technical field when you are an engineer?

0 Answers  

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