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what is the principle of switch gear? where its function ?
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Answer Posted / dhaval
Can you use relay replaced the switchgear?
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Classify driling machines.
i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value
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A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.
actually i can't understand what is 3dB ? and it's really not clear to me.please any one let it me be cleared.
What is different between Difnit time and instatous over current relay
what is method for testing CT
