How much resistance between neutral earthing and body earthing of Power transformer?

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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what is short circuit force ? How to calculate it for Panel?

1 Answers   Bilt,

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i want to model paper for section engg.

0 Answers   Infosys, RRB,

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Who many reason of ignition fail ?

0 Answers  

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what does a string of resistors in a series will do?

0 Answers  

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Dir sir we have 750 kva Caterpillar dg set we are fas on different problem we start dg set ofter 1 mint apply load around 500a dg was run one or 3 mint after 3 mints dg was shutdown automatic how to face tis problem

3 Answers  

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how to write program by ladder logic in case of PLC operation

3 Answers   Gridco, Sofcon,

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what is motor?

2 Answers   UIU,

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If I want to connect a capacitor bank on the HT side of a 11kV/415V, 3 phase delta-star distribution transformer to supply Reactive power to it..what practical specifications of a Capacitor bank that can i've??please reply..

0 Answers  

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I need a formula to calculate the size of cable as per load but in the terms of length. Please Reply me as i search lot of sites but i did not get the answer.

0 Answers  

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What is the use of starter in tube light fitting.how it works.

3 Answers   JSW,

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