1000kva substation

[razz]

good morning everyone
in a few weeks time i will have a nice new 1000kva transformer sitting here , i have sent my incoming supply and outgoing supplys to crabtree to have a panel spec`d , but how do i spec the cable from the ct chamber to my panel itself ? i think its gonna be in a metal trunking , any help would be gratefully received

ady

 

[cobrauk]

Well where we are UK Power provides us this handy doc, hope it helps

 

[Knobhead]

If you’re planning on getting 7 X 500mm (cu) or 7 X 600mm (al) in trunking, best of luck, you’ll need it.
You would be better of looking at a pre-assembled busway or ladder rack with aluminium trefoil clamps.
1000KVA is 1333.4A, you ai’nt getting that in trunking easily. I’d be impressed if you did.

Cobrauk, handy PDF but it is for LV incomers. It peters out at 500A this will be 1600A MCCB or fuses.

 

[Engineer54]

Do Crabtree make breakers suitable for 1MVA Distribution Transformers?? I would have personally gone to someone like Schneider to have a panel spec'd, who also have an extensive range of breakers to develop such a panel for you...

 

[razz]

why seven cables please , thought it would just be the normal 3 ph n + e coming from the ct cubicule as its seems to be called , a busbar system , now you mention it , sounds a good idea , thank you , cobrauk , do you have a 1000 kva document , yours goes to 300 , please

 

[razz]

my local rep says he thinks they do , i have to get two quotes anyway , so i`ll try another company

 

[Knobhead]

You would be better getting someone to design the system. You're out of your depth.

 

[razz]

your telling me , i have a man contacting me from merlin gerin shortly , he can work the lot he recon and give me pretty pictures too

 

[Engineer54]

why seven cables please , thought it would just be the normal 3 ph n + e coming from the ct cubicule as its seems to be called , a busbar system , now you mention it , sounds a good idea , thank you , cobrauk , do you have a 1000 kva document , yours goes to 300 , please

You'll probably need to parallel the tails off the TX, Even trying to work 600 or 500mm cables is going to be a real work-out for you...lol!!! What tony is calculating is 2 X 500/600mm per phase plus a neutral ...so 7 cables in all!!!
I think you'll probably be better off looking at increasing the number of parallel conductors, to reduce the installation hassle you'll have trying to bend set these large conductors onto connections at both the TX and the Switchboard....

 

[razz]

ok , thats also a good idea , sounds like its gonna be fun , which ever way i end up doing it , thank you for the replys , i`ll keep in touch on what goes on and how n when

ady

 

[Knobhead]

600mm sectored solidal isn't to bad to work with, if you know what your doing and have the man power.

 

[cobrauk]

Sorry ADI only have that one sorry i didn't read your post well it seems

 

[Engineer54]

600mm sectored solidal isn't to bad to work with, if you know what your doing and have the man power.

Don't you mean "Gorilla Power"?? lol!!

A 600mm conductor is just a little short of trying to bend/set a steel rod, especially on short tails within a panel!! lol!!!

 

[Knobhead]

Try 960mm, now that had us sweating. First 2 transformers I was involved with as an apprentice.
They don't move once you've set them :devil2:

 

[Guest55]

it will be easier bending 25mm conduit into a figure of 8 with your teeth than trying to form 500mm cable in trunking lol.

GRRR !!