Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?

3 Answers   KSEB,

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How can we design a HVAC Plant room which includes AHU,FCU,Chillers,Cooling towers, Pumps etc & how will they work? any Drawing if possible?

0 Answers   TCS,

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What is resistance reading of earth copper rod with grid and without grid?

0 Answers  

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In an alternator running with a balanced zero p.f. lagging load, phase differernc between the resultant armature flux and main field flux is always____? options is 180 degree....why?? explain.

1 Answers   BREB,

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how we can calculate earth fault current?

1 Answers   Alchemist,

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why field winding in synchronous machine connecting in star position?

1 Answers   HCL,

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Why semi-conducting insulation is used in XLPE cables?

1 Answers  

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How does a diesel generator works?

1 Answers  

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Is there a chance for a motor speed to become negative..?? What is the reason for such a phenomenon.? In that case does the motor works as a generator..???

1 Answers  

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for leading power factor penalty by SEB why

2 Answers  

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two transformers of the same type, using the same grade of iron and conducting material, are designed to work at same flux and current densities, but the linear dimension of one are two times of the other in all respects. The ration of kVA of the two transformer closely equal to................? options: 16, 8, 4, 2

2 Answers   Vizag Steel,

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Why is the earth socket in an electrical plug outlet made thicker and lenghty?

5 Answers  

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