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4 comments
Anonymous Poster #1

RMU Vs Switchgear

04/21/2011 3:42 PM

Hello,

I just need to know please what is the difference between a ring main unit (RMU) and Medium Voltage switchgear (with their different types).

Thank you.

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#1

Re: RMU Vs Switchgear

04/21/2011 4:41 PM

Have a look on Google for switchgear manufacturers.

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#2

Re: RMU Vs Switchgear

04/21/2011 10:23 PM

The main difference lays in the way they apply these switchgears or RMUs, as its name says,

For RMU, this application requests two substations to provide power for the local RMUs located at the inlet of each industrial consumer or a group of households.

RMU is a combination of several compartments including incoming (where the main power comes from 1st substation, one metering compartment, one outgoing to the consumer, and 2nd incoming).

While switchgear may have only incoming, metering, and outgoing compartment to consumer.

RMU itself serves as a switchgear because it could be fused, contactor, or breaker operation. Because of its special configuration, RMU is normally more expensive than a switchgear.

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#3

Re: RMU Vs Switchgear

04/22/2011 1:37 AM

RMU is basically a TEE joint of cable with controll and protection. It is a combination of 3 switch gears in one compartment. It isrelatively expensive but you are saving huge amount in reducing the cable length to make a ring or back feeding. It is convenient to install, connect and commissioned. The SF6 based RMU's are very compact and almost maintenance free. Installed out door also.

RMU also known as TRM

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#4

Re: RMU Vs Switchgear

04/25/2011 9:29 AM

dear,

RMU is a medium voltage switch gear. It is one kind of Power equipment

All medium voltage switch gear are not RMUs.

Depending upon the choice of design engineer, & Power supply requirements, we chose the equipments, what is to be used where.

Normally, RMUs are reliable fully up to 3 MVA transformer loads. Above, you have to go for Medium Voltage distribution Panels, of suitable fault capacity , & Safety interlocks.

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