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Participant

Join Date: Apr 2017
Posts: 2

Circuit Breaker Trippings

04/13/2017 5:29 AM

When closing command is given to the 132 kV CB then DC MCB controlling the motor running time, spring cgarging , motor overload and motor running over time SF6 first and second stage trips.

I am confused about the tripping reasons..

Lastly a short circuit had occured in this system.

When coil of contactor burns it will become open circuit or short circuit?

Is there any mechanism that we can check the coil condition?

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
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#1

Re: Circuit Breaker Tripings

04/13/2017 5:42 AM

<...confused about the tripping reasons...> The reason anything trips is that the measured value exceeds the trip point setting.

<...When coil of contactor burns it will become open circuit or short circuit?...> If this coil is fed via the trip system above, it would appear that it has failed short circuit.

<...Is there any mechanism that...can check the coil condition?...> Why do people think that CR4 readers know more about equipment then the equipment manufacturer (rhetorical question - NNTR)? The best person to ask is undoubtedly the individual at the end of the equipment manufacturer's Technical Helpline. After all, the forum does not know the part number, the maker, the serial number or the history of the suspect item. The manufacturer will have been there many times before. So, make the call.

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Power-User

Join Date: Jul 2016
Posts: 253
Good Answers: 8
#2

Re: Circuit Breaker Trippings

04/14/2017 12:13 PM

If the motor overload relays are tripping, that typically indicates a mechanical problem, the spring charging mechanism could be jammed, for instance.

If the electric supply to the motor is poor, then the motor may not be able to develop enough torque to turn at the right speed, that will make high current over some time, and trip the overload relay as well. Check voltage, all 3 phases if 3 phase are balanced, 1 phase check centrifugal switch, or brushes of universal motor.

Don't understand what 1st & 2nd Stage refer to..

Use an ohmmeter/clamp-on ammeter/voltmeter to check your coil, 3 tests while you attempt to energize...

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Participant

Join Date: Apr 2017
Posts: 2
#3
In reply to #2

Re: Circuit Breaker Trippings

04/14/2017 1:16 PM

Thanxx rwilliams

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Muzamil Faiz (1); PWSlack (1); rwilliams (1)

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