Answer / viraj

all are used to protect electrical equipment
in normal conduction all works as close switch but in abnormal condition they become open
vcb acb and sf6 are used with relay
vcb vaccume is used for arc removal
acb air is used for arc removal
sf6 sf6 is used for arc removal
mccb molded case circuit breaker to limit current

i heard that power factor(PF) is the main concern for industries, if they are maintaining PF around 0.6 they will be fined for that. now the question is, how can they improve the PF ranging between 0.9 to 0.95 which is safe for them i,e escaping from the fine?

5 Answers  

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7 Answers   Emerson,

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What is the difference between Earth Fault protection & Neutral Protection

1 Answers  

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How can we calculate the power factor of an electrical appliance ? Is there any formula ? Is there any meter around to calculate it ? And how to use that meter ? thanks

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how to find insulation resistance of a motor(415v) by theoretical formula??

2 Answers  

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How many points can we have in AC Circuit? Show by giving suitable example?

3 Answers  

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I am looking for LV CT test. To check the polarity of the CT only. Can you suggest any supplier. Different companies are offering CT/PT Tester which is expensive. Thanks

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why we are testing cables with DC supply not with AC supply?

9 Answers   Aurobindo, DEWA, L&T,

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WHY WE ARE DOING THE EARTHING IN A SYSTEM. SOME PEOPLE ARE TELLING FOR PROTECTION. WHAT PROTECTION GIVE ME THE CORRECT ANSWER.

2 Answers  

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how can calculated the rating of the 11 KV transformer?

6 Answers   NBCC,

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what is the higest transmission voltage and generated voltage in india

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what is LT & HT?

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