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What is UPS and How do you maintain the UPS Maintenance? Brief Description on UPS maintenance.

0 Answers   JLL, Nokia, Uttam Galva,

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sigal phase supply is 230 v ac two phase supply is 415 v ac then why three phase supply having supply is 415 v ac why not 690v ac

2 Answers  

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What is the si unit

2 Answers  

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how to calculate current when LT supply 415v fed to HT Motor 6.6kv and 1120kw.

2 Answers  

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how to calculate busbar size? ex:11000kva main what is the busbar size ?and how to select the correct one

4 Answers  

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What percentage netural current is in netural depend upon the phase current

1 Answers  

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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Which device is used for the source of emission of electrons in a crt?

0 Answers  

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when is the Ohms law is applicable?

11 Answers   ABB,

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Why used in netural grounding transformer for netural side

2 Answers  

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can we share mvar in parrelell connected alternators

2 Answers  

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1KVA transformer of different frequencies of 50hz,100hz,500hz&1000hz. which one of these transformer has big size? Give reason

16 Answers   Ecil, Engineers India, MahaDiscom,

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