Answer / l.chandrasekhara reddy

Grounding is used in US Electrical installation Standards (NEC,UL)

Earthing is used in European Electrical installation Standards (IEC)

What happen when increese more than 50HZ fequincy.

5 Answers  

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what is the difference between 4pole & 6pole DC Motors & give advantage ?

0 Answers  

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what is the difference betwteen overcurrent and short circuit fault?

3 Answers  

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what is form factor.and rms value..

1 Answers   IIM, Torrent Power,

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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

0 Answers   Premier,

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why transformers not work at d.c.-

3 Answers  

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how can we find a burden of potential transformer? what does it effects? how can we calculate rated load of it?

4 Answers   Areva, KPTCL,

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can any one list the class-a, class-b & class-c trips of power generator?

3 Answers  

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why the efficiency of generator is more than the motor in case of swinburne's test????

1 Answers  

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what is formula to cal cute earth pit numbers and size of earth strip used in earthing?

0 Answers  

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What's the part of OTCC in transformer?

7 Answers   Bhel, RRB,

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what is meant by IGBT how they differ from tyristor ?

0 Answers  

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