Answer / m.s prabhu

THE TIME DURATION OF THE INRUSH CURRENT IS LESS SO THE CTs
WILL SATURATE, TIME DURATION OF THE INRUSH CURRENT IS LESS
THEN THE PICKUP DELAY OF THE DIFFRENTIAL RELAY.

Answer / vinod

During the first charging of transformer the magnetising
inrush current is second harmonic, differential relay is
provided with second harmonic trip by pass with sufficient
time. Also 87 relay having 5 th harmoninic by pass during
lightning surges.

Answer / k.prakashchandra

The currents in both primary and secondary for the same
phase are balanced.

how we can check new PT ? without name plate.

1 Answers   Indo Power Projects,

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what is the difference between star and delta connection ? when we use each one ?what is the best ?

14 Answers   Amara Raja, Daikin,

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what is the dedicated neutral earth in ups? y its required?

4 Answers  

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Give idea about General Engineering. From which book i can study this topic. Pl. reply me via email. My email is ravi@bhelhwr.co.in, also give the name of book/website, from where i can prepare it.

0 Answers   TATA,

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how to check the stabilty test for generator differential protection

1 Answers  

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what is EP panel and AHS panel

2 Answers  

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how many test is necessary for 27mva transformer.

3 Answers   HEG,

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What difference between MCB,MCCB,RCCB,ELCB please explain briefly with its rating.

3 Answers  

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How many energy meters can be connected on a 15VA Voltage transformer. please send a calculation sheet.

0 Answers  

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Is it required to lay 2 runs of GI wires along with armoured cables from one power DB to another Power DB?

0 Answers  

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how harmonics are generated due to nonlinear load & how harmonic filters work?

1 Answers  

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What should be the conservator minimum oil level required in 2 mva transformer

2 Answers   JSW,

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