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Question
how we select the mva rating of the circuit breakers?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
accordig to the voltage of the system & peak value of fault
current to be interrupted by the breaker
 
Is This Answer Correct ?    5 Yes 0 No
Akhilesh Negi
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
why is electricity produced and distributed in multiples of 11. 440V, 11KV, 22KV, 132KV etc bhel 2
why there is a temperature rise at different metal to metal contact at cable lug??suppose cable is aluminium and the lug is copper,than why the temperature rise takes place?? JK-Cement 1
What happens on the secondary of a 33kV/11kV when one phase of the primary fuse blows?   3
why voltage drop will occurs in 3 phase line? ABB 12
What is meant by knee point voltage?   2
What is AVR in Generators and How is it working.   4
Sir, why generating power plant operating at above 0.9 lag? detail explaination? Kirloskar 1
Dear Sirs, I am a technical persons.In one of our Electrical Sub- Station, We have installed three numbers of 1250KVA ,11KV/0.415KV Transformer to feed the Factory load. We have found some abnormality. In one of our Transformers the leakeage current from transformer body to earth through earth continuity wire is almost 86 Amp but in other transformer it is (5-10)Amp. where the load current on three phase and neutral are respectively 1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical person help me about the reasons of this situation and how I can rectify the fault. Moreover,I have measured the earth resistance of the Earth continuity wire which is less than 1 Ohm. Thanks Tapas Barua   2
what's burden resistor, why it's used? Bhel 1
what is the purpose of interpose t/f in control and relay ckts?   2
What is meant by Active and reactive power? Schneider 22
What is IGBT?Where it is used? What is the difference between IGBT and Thyristor? HBL-Power-Systems 5
 
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