Answer / thrimurthy

over current meance nothing but a current reaches above the
rated CT Ratio. and over load and fault occur in between 2
lines line to line short circuit it is over currein fault.

Earth fault means fault occur between line to ground is
called Earth fault. used in power system

Answer / k.prakashchandra

It is 2 OCR + EFR scheme for line protection.Usually OCR is
provided for R & B phases and EFR is connected between the
star point of CTs and star point formed by OCRs (R & B
phases) and direct lead from the third CT (Y phase). R &B
phase ct currents through the OCRs, and Y phase ct current
directly form the second star point.

Can anyone tell the proper diagram of star delta starter????

0 Answers  

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To have variable speeds we use a. Induction motor b. Traction motor c. Shunt motor

1 Answers  

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would you please give me any idea about the BARC interview question on electrical? i have an interview on 1st july.....plz hlp me.......its urgent......

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A system absorbs 100 k J of heat and the increase in its internal energy is 100 kJ; the work done is

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if there is nutral in phase why we use earthing wire and grounding? even at fault condition the fault current flows to neutral (it is a lower path)

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new 90kw motor installed so how I purchased cable ,fuse,etc please give me technic for cable selected why always capacitor delta connection

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If UG power cable both ends are to be earthed or what? If not why?

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In A.C systems, fuse is placed in phase-in order to disconnect the circuit during faulty condition. But, what is the reason for putting "LINK" in neutral istead of connecting through (same) wire.

3 Answers  

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mostly the questions were from machines... d.c. machines, transformer, synchronous and induction all theory paper........ few from power system... but the level of paper was easy.....

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why HV test for cables?.why 0.7times?

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What is YNyn Transformer? and what are the other types in this?

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Currently what is the highest capacity (MVA) of SPPg generator available in the market?

0 Answers   SPPG,

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