If we have 630kva step down transformer to operation 3 phase motor 150 kva which size of cable is used? at circuit breaker to 3 phase motor or to electrical board

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What is tan delta & PPM in transformer? and whats its IS value?

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Do any one know exacatly when the results for NHPC held on 8th march 09 for engineering trainees will be released ?. if so please post it, i'm eager to know it.

0 Answers   NHPC,

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what is diversity factor ? plzzzzzz describe me

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what are the shades for mimic diagram i.e for 3.3kv,6.6kv,11kv,22kv and 33kv? which is the IS for mimic diagram?

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what are the usual topology of transformers at different substations in the power system and why that particular topology is choosen. what are the limitaions of that topology?

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what r the main parts of central chiller plant in Air conditioner ? explain the function of each?

12 Answers   ITC Infotech,

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why one side of tubelight glows after switch off ?

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From what on-site components does the HT panel monitoring the bus-bars in a 11kV system take inputs?

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what is max. continous current of LT side of distribtion transformers? ie for25kVA, 63kVA, 100kVA, 200kVA etc

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Do you know the faults occurs generally in motors and how to rectify them?

4 Answers  

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Can you any one explain different between instantaneous over current and IDMT

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