Breakers Inside Padmount Transformer

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Would you have to put on unreasonable PPE to open the transformer case to get at the breakers? I think it is safe to assume that the intention was not to be required to de-energize the transformer to operate the breakers?
 
Where on earth are the low side bushings? Buried behind that mess? Hope nobody ever wants to pull an oil sample.

For all the effort and butchery it would take to build that, you could mount a 3R MDP to the outside of it and it'd be a heck of a lot better solution.
 
jcook106 said:
I have never seen an installation like this before:

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It seems like such a bad idea... But, I can't find anything in Code or Standard which says you can't do it.
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T here may be a simple answer. Did you look at the nameplate and lable for the transformer? It should be UL listed as an assembly. While in OEM sales I provided numerous breakers tty O one of my major liquid cooled padmounted trsnsformer manufacturers. While working for a custom drytype transformer manufacturer we provided molded case breakers mounted in the LV ATC of our transformers. But, they must meet the requirements of our UL listings for the assembly.
As re you aware of the Westinghouse, now Eaton, "mini power center" and the SqD "mini power zone?" Both are encapsulated drytype transformer assembled with load centers in the same enclosure.
 
It’s a common arrangement throughout the world. You order a single unit and it arrives as a monoblock assembly of MV switchgear, transformer and LV switchgear. I’ve installed a few in the UK, so long as you have the groundwork in place they really speed the job up.
 
Tony S said:
It’s a common arrangement throughout the world. You order a single unit and it arrives as a monoblock assembly of MV switchgear, transformer and LV switchgear. I’ve installed a few in the UK, so long as you have the groundwork in place they really speed the job up.
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You have a cut sheet for what you describe? I have seen combination MV and LV units, but never where they were built into each others wiring compartments: They were always built with segregated space so neither the switchgear nor TX interfered with the each other.
 
big john said:
... but never where they were built into each others wiring compartments...
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It looks like the transformer LV was designed to have a panelboard mounted into it. There are strut type mounting channels welded to the transformer tank and painted transformer green.
 
This is one I was called in to carry out switching operations on late last year (I’m supposed to be retired).

The electrical gear was fine and well maintained, a bit rusty in places but nothing a bit of paint wouldn’t cure. The housing is past its best and needs the cladding and roof replacing, hence the photographs they were for my report.

The Yorkshire Switchgear 11kV Tee switch, the busbars go direct in to the transformer tank.

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Transformer

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Merlin Gerin LV distribution board fed by busbars from the transformer tank.

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