Answer / utl

Generators

what is the meaning of powerfactor

6 Answers   NTP,

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wat is the criteria we use the diff. relay ?

2 Answers  

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if we increase frequency of line, then how will string efficiency varies with it.

2 Answers  

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

1 Answers  

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why star point of motor shall not be grounded?

8 Answers  

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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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what is the maintain in ACB,VCB,MCB,MCCB breakers?

4 Answers   CTS,

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For 415v,3phase,22kw rating of motor how to calculate MCCB rating

2 Answers   Zigma Technologies,

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If i have two 3000 kW motors and the whole facility requires a 10 MVA transformer. What would be better installing two 5 MVA transformers(one for 1 motor ) or just a single 10 MVA transformer for both of them. Give reasons for your answer.

4 Answers  

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What is HT? And specify the range of voltage?

5 Answers   HSL,

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What are the effects of armature reaction on a DC machine and discuss the various methods to reduce the effect.

1 Answers  

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why dc is used in control circuits for MV & LV switchgeras instead of ac

0 Answers  

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