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Which of the following circuit breakers is prefered for EHT applications ?
Sf6 CB
air break circuit breaker
low oil circuit breaker
bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker
bulk oil circuit breaker
Answer
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Related Question
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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is
2
6
4
8
2
6
4
8
Answer
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Series capacitors are used to
improve line voltage
None of these
compensate for line capacitive reactance
compensate for line inductive reactance
improve line voltage
None of these
compensate for line capacitive reactance
compensate for line inductive reactance
Answer
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An isolator is designed to open a circuit under
full load
no load
None of these
normal conditions
full load
no load
None of these
normal conditions
Answer
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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is
35 kA
20 kA
60 kA
80 kA
35 kA
20 kA
60 kA
80 kA
Answer
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Air blast circuit breakers for 400 kV power system are designed to operate in
0.5 sec
50 milli-second
100 micro-second
0.1 sec
0.5 sec
50 milli-second
100 micro-second
0.1 sec
Answer
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