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Anonymous Poster #1

Ring Main Units

08/16/2017 9:48 PM

Hi,

Ring Main units encloses 11 kV vacuum circuit breakers or MCCBs in a sheet metal enclosure and maybe of 11 kV or 400 volts of rated panels rating.

But what is the meaning of extensible ring main units? (like 3 way extensible ring main units).

Best Regards,

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Guru

Join Date: Mar 2007
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#1

Re: Ring Main Units.

08/16/2017 10:38 PM

An extensible system is one whose internal structure and power flow are minimally or not affected by new or modified functionality...an increase in rated voltage is handled by an increase in the insulating gas pressure.... three-position design, having the possibility to close or open or earth the feeder in question....

http://electrical-engineering-portal.com/ring-main-unit-rmu-as-an-important-part-of-secondary-distribution-substations

http://www.schneider-electric.com/en/product-range-presentation/968-ringmaster/

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Anonymous Poster #1
#2
In reply to #1

Re: Ring Main Units.

08/17/2017 9:24 PM

but i was asking for 3 way extensible, four way extensible, and five way extensible - and not 'three position design' - I am sorry but i could not understand it - the difference is not clear to me.

Best Regards,

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Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19251
Good Answers: 1128
#3
In reply to #2

Re: Ring Main Units.

08/17/2017 11:02 PM

The 1-5 way are the number of load breaking switches and wiring configurations possible with that unit....Extensible means it can be expanded or added to...You can have no Vacuum breaker or 1 Vacuum breaker or two Vacuum breakers with the 3 way switch option, then you have the Load breaking switches all in one box or mounted separately....

https://www.breconenergy.com/titan

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