KVA to amps help

[geordie]

Have got a new supply going in and have been told its 300KVA 3 phase now if i have worked it out correct is comes in a 433 amps which going by the size of the places i would expect to be per phase. Which i take it would be fused down to 400 amps by the DNO

 

[Guest55]

are you telling us or asking us ? ;-)

yeah 400A per phase is a standard dno supply size.

 

[ImpededLoop]

I'd agree, 400A 3 phase supply.

 

[Knobhead]

You’re right except for one thing, it won’t be 400V. It’ll still be fused at 400A

@433V it works out at spot on 400A

 

[geordie]

Thanks Guys always worth double checking things

 

[Guest55]

grow an awful lot of weed with that much power on tap !

oops , wrong forum :-D

 

[Darkwood]

Quick ball park sum for it is:-
3PH is Amps = Kva / 0.73
3PH Kva = Amps x 0.73

1PH Phase use 0.25 instead.

 

[telectrix]

is rtrhat 2.5 th successful propportoin of the plasnts thast grow inro maturity>?

 

[telectrix]

oooww.ps. ale is typring. bewweet shut ip. n

 

[atm84]

Quick ball park sum for it is:-
3PH is Amps = Kva / 0.73
3PH Kva = Amps x 0.73

1PH Phase use 0.25 instead.

Yes I agree as a quick ball park but a much more accurate figure is say 200kVA:

200,000/ 692 = 289 amps per phase

 

[Knobhead]

That’s based on the mythical 400V whereas a DNO transformer will be 433V and its rated current output will be based on that.

100KVA=133.3333333333333333333333333A

Not that it’ll make any odds, they’ll just bung a fuse in that’s the next size up.

 

[atm84]

Since when did a DNO transformer work at 433v?

 

[Knobhead]

Since when did a DNO transformer work at 433v?

For the last 80+ years.

Measure the voltage at your house. I’ll put money on it not being 230V but nearer 250V.

I assume you’ve not been an electrician for long.

 

[Simonslimline]

For the last 80+ years.

Measure the voltage at your house. I’ll put money on it not being 230V but nearer 250V.

I assume you’ve not been an electrician for long.

248volts last time i measured it in my flat.

 

[atm84]

Since when did a DNO transformer work at 433v?

For the last 80+ years.

Measure the voltage at your house. I’ll put money on it not being 230V but nearer 250V.

I assume you’ve not been an electrician for long.

Haha always has to have a dig don't you? What relevance is that. For your info I was a electrician for over 8 years before moving onto bigger and better things.