what will happen if ac motor given dc supply?

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What happend if we connect star point to ground of a star connected motor? And what will be effect on system and effeciency of motor?

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What are formula we can apply to determine the HT/LT current of 11KV/433V transformer except KVA/LV×√3. ?

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Why the frequency of ac in india is 50 hz but in some other countries it is 60 hz.

0 Answers   BARC, Fedco, Qasco,

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tell me about vfd

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Why tripping not occur when the transmission breaks? Doesn't we provide earthfault protection for it?

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for hipot test on 33kV busbar, we will test on 70 kV or 56kV, what is the acceptable leackage current?

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What is the amount of no load current of 630 kVA tranformer voltage ratio 11kV/440V ?

13 Answers  

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What is mean by hormonics?

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What is systematic error?

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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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I AM DOIN MY 3RD YEAR IN ELECTRICAL ELECTRONICS. PLEASE SUGGEST WHAT DO I DO NEXT AFTER MY B.E? AND I WANT TO GET INTO ANY PSU IS DER ANY EXAMS PLASE SUGGEST EVEN THAT.

3 Answers  

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