What is the Relation b/w star delta starter , DOL starter and two speed starter. if we want to rotate a 20 kw fan in 2 speeds which type of two speed starter we have 2 use?

1 Answers   ABB,

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Can RCD's used to protect the VVVF drive if not why.

0 Answers  

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tell me any book for current n potential trasformer with full knowledge ?

1 Answers  

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What are the different protection systems used to protect the transformer internally and externally?

16 Answers  

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when will cause the negative sequence falut in electrical system?

2 Answers   Schneider,

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Define maximum demand?

0 Answers  

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what is mean by hvdc transmission technology .what is principle of hvdc transmission and technic of hvddc transmission .

1 Answers  

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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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Difference between MCC and PDB

3 Answers   BARC, CDS, NINL,

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how to changeover ups in this power failur time?

0 Answers   Essar,

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How to select the cable size for the given load ?Pls explain the Formulae

3 Answers  

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how many BUSBAR is in electrical system?

3 Answers  

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