substation transformers

333rocky333 · 26 Oct 2014

We do shops and they have two 1250 amp 3 phase airbreakers and the busbars can be linked via castell units to temporary run from one transformer.

Recently we had problems and in this particular shop i was asked whether it would overload 1 transformer, without knowing the size of the units and there was no access then one could only assume it was designed for this.

He later asked network power when they arrived and thinks they said one was a 4 and the other one was an 8, so what would they have meant by that and what sort of load would they be cabable of.

westie101 · 26 Oct 2014

He later asked network power when they arrived and thinks they said one was a 4 and the other one was an 8, so what would they have meant by that and what sort of load would they be cabable of.

Honestly no idea what he was talking about,
400A/ph, 800A/ph?
400A overall, 800A overall?
400kVA a very rare size?
800kVA a very common size?

333rocky333 · 26 Oct 2014

Ok, maybe the store manager was confused

if it was say 800 Kva each one then would that be the total of 3 phases and about 1000amp per phase then

Jackrae · 26 Oct 2014

I'm probably totally wrong but this sounds a bit like the classic disaster scenario looking for somewhere to happen; with the "responsible authority" unable to explain their systems and the "knowledge bank" is empty.

333rocky333 · 26 Oct 2014

Actually there was one site years ago, where it was linked out and the transformer apparently got a bit hot, then again at this site the back up generator started up and caught fire last year.

There are schematics with the sizes on site, so providing there still current thats all we can go by as there usually padlocked in

westie101 · 26 Oct 2014

if it was say 800 Kva each one then would that be the total of 3 phases and about 1000amp per phase then

That would make sense with, if the conditions are good, a permitted overload of 36%

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substation transformers

333rocky333

westie101

333rocky333

Jackrae

333rocky333

westie101

DIYnot Local

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