Answer Posted / rd dadhich

1.It is very common practice to use battery with charger for
protection , operation & indication in HT switch gears due
to most relable system to work as after charging only
battery comes directly in line during failure of AC supply.
or power supply.

UPS can be used theoretically , but we are adding one more
week link in critical protection supply due to addition of
inverter. , as inverter is :-

AC supply . > Battery Charger > Battery > Inverter

Where as battery charger is only :-

AC supply . > Battery Charger > Battery

2. AC coils of tripping & closing are un common & bigger in
size.

What is proportional controller?

1350

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How to set the relay,,??

2139

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what are the parameters plays a major role in Potential transformer Burden calculation??

2274

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what is the working principle of a DG Set, Alternator, & exiter

10266

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What si the d/f b/w KVA & KWH, kvarh & kvar, kwh & kvar phase voltage & line voltage

6226

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I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

2170

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what type of questions are asked and howmwny questions belong this catagory?

2160

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Maintenance of transformer???

2302

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how a flip flop can be used as a latch?

2050

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i am trying to PSUs/govermeant jobs since last 2 years but still i m not success, plz help me.

1992

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How can ou verify the size of conductor 50Sq.mm ACSR

1994

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Testing procedure of DG alternator stability test

1631

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What is different between resistance grounding system and resistance earthing system?

1209

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What is the need for a controller?

1279

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sir i am apearing for nic exam.i dont know exam pattern.can you please send me some model papers

2031

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