Answer / sameer

transformer is device protected by buchholzz relay from fault (short ckt) in the winding of transformer. capacity above 500 Kva this relay is used.

Answer / e.subhash

pressure relief valve

What is ac and dc drive.

1 Answers  

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what is the difference between on line & off line UPS

3 Answers  

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what is relation betn. KW & KV?

10 Answers  

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What is a current transformer?

2 Answers   KEPL,

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What happens to voltage when current is zero?

0 Answers  

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Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz. From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.

2 Answers  

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can we replace Dyn11 transformer to Yy0 transformer and what is the difference between the two type

1 Answers   Arab Contractors,

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The DC current waveform is - . What about the fire alarm waveform?

1 Answers  

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hi frds, i m electrical engineer.can i get cdr for electrical engineer if u have then send me on my mail id its jayesh_ee88@yahoo.com.please help me frds

0 Answers  

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Why the colour of insulator is always is chocolate in colour?

1 Answers   MRF,

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Can any one help me how to set an overload set the range from 2.8A to 4A , rated motor current 22A, CT 60/5A

2 Answers  

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What is Earthing?

16 Answers   Essar,

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