what is the difference between ac and dc hipo test of cable?

2 Answers  

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Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

2 Answers  

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which tap of the transormer you will use in critical condition(worst)?

1 Answers  

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I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current 36 A,but wenn i put load after 2 hours the current increase more than 156 A. Can anybode tell me waht is the Problem?

4 Answers   ABB,

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An electric bulb giving light but at the time of lighting which one it takes? voltage or current

6 Answers  

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can three phase induction motor rotate with only 2 phases connected

22 Answers   Delta, Mannar Company, Suntron,

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can any one suggest websites having study maetrials for the electrical students?

1 Answers  

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why are installed water leakage detection system data centers & server rooms

0 Answers   Reliance,

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what is difference between co-generation and captive power plant?

3 Answers   TATA,

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what should be the air clearence between phase to phase, phase to earth in Medium voltage switchgear for 3.3kv,6.6kv,11kv,22kv and 33kv? Which is to be referred for this?

1 Answers   DLF, Sanmar, SEC,

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what's the exact magnitude of current, flows through Neutral?

0 Answers  

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why CERAMIC material is used in insulators??

1 Answers  

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