MV (10KV) switchgear extraction 1

[mastergate]

On a MV panel, is it possible to extract one complete cabinet located at the middle without touching neighboring ones?

For makes such Merlin Gerin, Eaton...

Thanks for help

 

[dpc]

The bus extends between sections. So in most cases, no, it is not possible.


David Castor

http://www.cvoes.com

 

[mastergate]

Looking how cabinets are assembled one by one, I would think that manufactrurers provide an opportunity for dismantling and removing one cabinet even in the middle of the swithgear.

 

[davidbeach]

Nope. Cross bus is spliced in each section.

 

[mastergate]

busbar sections are just bolted

 

[davidbeach]

So, the cross has to be disconnected in the adjacent bays and removed before the intermediate section might be removed. On the other hand, the sections should be so tightly joined that there will be no wiggle room to remove the intermediate section anyway.

 

[dpc]

I didn't say it was not possible to remove a section, but your question asked if this was possible to remove a section without touching adjacent sections. And presumably, you'd need to insert a blank section to allow the two ends of the bus to be reconnected?

Maybe if you told us what you are actually trying to do you will get a better answer.

Also, confirm that this is IEC-type switchgear and not ANSI. That may make some difference as well.

Don't expect us to spend more time working on a solution than you spent typing the question.

David Castor

http://www.cvoes.com

 

[mastergate]

Thanks for your answers.

I attached a sketch showing what am trying to do.

Please help

 

[mastergate]

here attached

 

[davidbeach]

If it is built anything like ANSI gear -

You are definitely going to have to be into the back of sections 9 and 10 to disconnect and remove the cross bus. There may also be great difficulty sliding sections in and out from between existing sections. If the original installation was as tight as it should be, it may required demolition of at least one of the sections to be removed. Don't know how you'll get the section new section into place.

 

[gattie]

To remove the Panels you will of course have to completely isolate both Front & Rear 11kV Busses & all auxiliary wiring during the entire process.
Front & Back Bus Bars Fish plates, control wiring connections, need to be unbolted, as well bolts securing panels to one another & to the floor.
You may have to fit additional voltage transformers to serve the separated buses as well as bus chamber end cover plates on each end.
Sliding the redundant panels out should not be too difficult.
Safety is paramount!

 

[dpmac]

Where is Zog when you need him! His people do this kind of thing twice a week.

 

[Marmite]

Who is the manufacturer and what type of switchgear?
Regards
Marmite

 

[mastergate]

It's an IEC gear. Make: Eaton/Hazemayer (Unitole UT - Holec).

As the section 11 (bar rising) will not be re-used, it can be destructed in order to extract safely the section 10 (bus-coupler).
What do you think?

As the lenght of the 2 sections to be inserted is exactly the same as available space, do you think it's feasible?


gattie: for voltage transformers, they're integrated to incomers, so no need for additionnal.
Actually in the existing configuration, we have 2 HV/MV transformers (1 working + 1 standby).
The aim of this modification is to separate the 2 bus sections and to add a feeder on bus-1.
Both transformers will be working and a standby will be added in another building).

thanks.

 

[jraef]

It's impossible for us to tell from here based solely on a sketch. Some gear is built to NOT have double walls, in other words each section may not be completely stand-alone and there is only one barrier wall between them. So if you remove those two sections, you will leave one section with no side wall. So again, the concept of "without touching adjacent sections" seems somewhat untenable.

But assuming you can shut down the ENTIRE lineup to work on it, and have it shut down the ENTIRE time, then I don't see why this could not be done.

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[LionelHutz]

I've been involved in a few cases where something similar was done. The enclosures did pull-out of the middle of the lineup.

If by "without touching", you mean not damaging or removing the adjacent sections then yes, it should be possible. If you mean not even opening the adjacent sections then it's highly unlikely.

 

[mastergate]

thanks all.

Actually 'without touching' means without removing.
Opening adjacent sections should be possible.

 

[Marmite]

One thing that's unclear to me is what you are achieving.
You are taking out two panels, a bus coupler and riser. You are installing a feeder C/B and a bus coupler. Have you managed to find a bus coupler that achieves in one panel width, what was done originally in two panel widths? Where is the riser for the bus bars?

Regards
Marmite