what is the transformer

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why generator and t/f ratings given in kva & motor rating is in KW?

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I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers  

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can anyone tell me the website for star-delta control diagram?

1 Answers  

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why a diode bridge is provided in vcb control circuit ?

2 Answers  

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What is the difference between an ELCB and a RCD?

2 Answers   Schneider,

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what is the role of energy meter in distribution system ?

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How to calculate the Harmonics losses in terms of cost/unit.

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what will be the effect on the voltage .if power frequency is increasing or decreasing.

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1. Design a counter which counts 0, 4, 8, 2, 6, and repeats using: 1.a using JK flip flops 1.b using T flip flops 1.c using D flip flops

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What should be the overcurrent, instantaneous overcurrent, short cicuit current settings (i.e. how many times of motor full load and what is the time duration) for a motor?

1 Answers  

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Batteries used for electrical energy storage are a. Laclanche cells b. Edison cells c. Lead acid cells d.any of the above

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