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Power-User

Join Date: Jul 2011
Posts: 258
Good Answers: 1

Busbar Protection

12/01/2017 12:34 AM

consider the figure below containing two busbars (BUS 1& BUS 2) of 20KV fed by a turbo generator. the two busbars are placed in separate rooms connected by power cable of distance 25 meter. the vacuum circuit breaker "VCB1" has a dedicated protection relay installed in its cubicle. but VCB2 ,which is incoming of BUS 2 has no protection relay.any fault on BUS2 will be cleared by VCB1 and VCB2 will not trip.so VCB2 will not trip for any fault on bus bar 2 . i want to know is it ok or should we install a seperate relay on VCB2? what are the technical problems in not installing a protection relay in VCB2 switchgear.regards.

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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 ["brexit" - ugh] as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
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#1

Re: busbar protection

12/01/2017 6:27 AM

<...is it ok or should we...>

  • If it exists, then the degree of <...ok...> will have been determined by the designers and the individuals who commissioned it. Their names and telephone numbers are on documents that cannot be seen from here.
  • <...should...> implies there is a standard to be complied with, which cannot be seen from here. The country of installation has not been stated, nor has the standard to which the installation is to be assessed.
  • <...we...> please do not use undefined pronouns. The capabilities of the <...we...> cannot be assessed from here.

All <...VCB2...> is doing is disconnecting <...BUS 2...> from the feeder cable. Circuit protection device(s) exist within <...VCB1...>, according to the original posting, which protect both the feeder cable and <...BUS 2...>, so another possibility to consider is the removal of <...VCB2...> altogether.

Local standards and protocols will determine the correct course of action. "Do nothing" is among the options.

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Guru

Join Date: Oct 2008
Posts: 40039
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#2

Re: Busbar Protection

12/01/2017 9:56 AM

Beware, if you don't know what you are doing, don't do it.

This might be the result

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Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8484
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#3

Re: Busbar Protection

12/03/2017 1:51 PM

See my responses to your previous questions.

Based on your previous posts I am not confident you should try as I don't believe you have the necessary education and training to perform such a delicate and dangerous job.

I would strongly advise other professionals to do the same. I view your continued questions on CR4 to allow you to perform your job as unethical on multiple levels.

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jack of all trades
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Active Contributor

Join Date: Sep 2017
Location: Russia, Moscow
Posts: 23
Good Answers: 2
#4

Re: Busbar Protection

12/06/2017 1:19 AM

So sometimes it's done. In this case, it is necessary to check the sensitivity factor of protection of VCB1 under min short circuit outside the territory BUS2

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