Answer / d r v n murty

to prevent from arc

How to know the back up time for a 5KVA UPS which is connected to 15 nos. of computers? Is there any formula for this? pls. tell me.

1 Answers   HAL,

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what is mean by PIR in circuitbreaker and give me detail of that?

0 Answers  

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Why TAP changer provided in primary side of HT transformer ? and why not in secondary?

9 Answers   ABB, Reliance,

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why dc measurements are noted in mc whereas it is mi in ac measurements?

1 Answers  

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can we use IGBT as a AC-DC converting device in the applications?

2 Answers  

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what's burden resistor, why it's used?

1 Answers   Bhel, TVS Group,

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We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers  

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HOW DEFINE THE IP FOR ELECTRICAL EQUIPMENT AND WHAT IS THE IP OF PANELS USING IN HAZARDOUS AREA ?

2 Answers  

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for 24000kv transformer what is the value earthing resistence?

1 Answers  

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hi friends how 3 phase converter functioning ?what is working principle of rotory phase converter ?

0 Answers  

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What should be the earth pit resistance value?

7 Answers   BARC,

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Is LV shorted in magnettic balance test?If yes why?

2 Answers   Hindalco,

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