INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

RMU and switchgear

RMU and switchgear

(OP)
Hello friends,

could someone please explain the main difference between a ring main unit and MV switchgear. in a substation do we have to have the two?

RE: RMU and switchgear

Switchgear is a fairly generic term for equipment which incorporates switches or circuit breakers.

An RMU is a specific type of switchgear comprising a pair of switches for a ring circuit to loop in and out, plus a switch-fuse or breaker for the tap-off feeding the load, all integrated into a single unit.

RE: RMU and switchgear

In MV switchgear, you can have incomings and outgoings as per load. But in RMU it is mainly two incomings+1 outgoing so that your outgoing power is not disturbed.

Thanks,
Vijay

RE: RMU and switchgear

But, RMUs with multiple feeders are also available in the market. This is a variation of the basic RMU.

RMUs are mostly suitable for outdoor installation with minimum protection and controls. In some cases even the external control supply also not use.

RE: RMU and switchgear

Agree with Krisys.
Maybe you can check ABB Safeplus for more details.

Thanks,
Vijay

RE: RMU and switchgear

I am currently using Schneider 12kV RMU's in Minisubs (630A Isolator/200A Breaker/200A Breaker) and as a Main 11kV Switchboard 20kA we find its a cheaper option than the withdrawable
type. One can add features such as standoff trip/close facility. The VIP410E protection relay has adequate settings.

RE: RMU and switchgear

For the Schneider Make RMUs, you don't need a separate control power supply. It uses the self powered release mechanism. This is a specific advantage, when it comes to the remote area, where providing a dedicated control power supply is a problem.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close