how to compute kvar in substation feeder to improve power factor and sending voltage

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hello! can anyone explain to me how a 3 speeds table fan work? what are the factors that are controlling the speed of a normal table fan? Is it by varying the voltage or changing the magnetic field? would appreciate your reply :) thx in advance.

2 Answers  

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What is IGBT?Where it is used? What is the difference between IGBT and Thyristor?

5 Answers   AC, Formo Plastic, HBL Power Systems, SECL,

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Thermal withstand capability under full short circuit conditions, in terms of number of times of occurrence of short circuit and corresponding anticipated percentage reduction in transformer life.

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It is being often experienced that due to single phasing fault of any source transmission line of any closed loop synchronized circuit all the power transformers with primary stared trips but the power transformer with primary delta wont, why ?

1 Answers   MSEB,

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What is deference between MCB & MCCB & ISOLATOR

0 Answers   Prakash Industries, Standard Chartered,

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why abcd parameters are called transmission parameters

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what is the kva rating of 20 kv transformer?

1 Answers  

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What is Working principle of electronic choke?

1 Answers  

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what is joule?

2 Answers  

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working principle of current sensing relay? how its work?

1 Answers  

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Different types of relay fault which phase sequence??

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