Answer / badhehm

01)Over-current protection
02)Short Circuit Protection
03)Ground fault protection

How to calculate the NGR value for a 2.7MVA Transfomer, 11KV system where the fault current has to be limited to 50A?

1 Answers   Sterling Wilson,

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A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.

0 Answers  

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A long transmission line is limited by - a)thermal limited b)voltage limited c)stability limited d) L,C limited please explain with proper reason.

1 Answers  

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If ac voltage applied to the field of dc generrator the output of dc generator ?

1 Answers   SSC,

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what is the advantage of using 3 phase line rather than using 2 phase line?

2 Answers   Havells,

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what is the difference between control transformer and Potential transformer (PT)?

1 Answers  

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what should be correct gas pressures to be a 1.5 ac unite

0 Answers   DDK,

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ple send to the how to improve the efficiency & economical to the thermal power plant

1 Answers  

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What happen if 200 KVAR capacitor connected to power continuesly?

0 Answers  

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what is the difference between CT and CVT in EHV Sub Stations

4 Answers   Hofincons, Lanco, TATA,

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how to check ac servo motor

0 Answers  

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what is the powerfactor

5 Answers   GVK,

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