Cable Size

A little more information is required before any meaningful answer can be given to the first question. Voltage and type of supply system (DC, AC single phase, AC 3-phase) would seem like a good start. Desired cable material (copper, aluminium)?

As to your second question, it depends on the type of load, but probably you will need more transformer capacity to supply 1000KW. If the load was purely resistive, and if you didn't mind running the transformer at 100%, the you might just get away with this transformer alone, but is this a good idea?

We are setting up a new block factory for that I have to calculate the cable size. The details are ----

Voltage = 380v AC 3phase

maximmum load = 585 kW minimum = 535 kW ( Block Plant )

load = 415 kW for future facillity

Available Transformer = 1000KVA We have requested another Transfomer of same capacity

As mentioned earlier the distance is 245 m and desired cable material - copper

Help me !!!!!!!!

If anyone know the website for free online calculators it will be great...........

380/220 V, 50 Hz system is EU standard so if you do not have your country tables, maybe German or UK would be available. US _ NEC tables for Cu can be used for comparison. The supplier (your source for buying cables) should have also tables for cable ampacity. Be sure to apply all factors (temperature etc.) in multiplication.

I apologize for errors in my first post.

As Paul said you need to post more information. I am interested in your background.

This is a simple problem for anyone with sufficient experience in the electrical field.

Do you have any experience?

1000 kVA trafo will not be suitable for your load of 1000kW.Assuming the pf of the load is 0.8 ,kVA rating required will be 1250 kVA further you have to consider other aspects,in my opinion you may have to go in for 1500 kVA trafo.

All extra questions necessary to select (a) transformer, (b) cable are essential.

About the load it is also v. important to know:

_ Its fluctuation in time. E.g. if 1000 kW is just a 15 minute peak and the rest of the time (say in 24 hrs) is 600 kW, 1000 kVA transformer would be OK.

_ The temperature at the time of peak demand.

_ The type of transformer cooling system: AIR, OIL or OTHER. As well as its overload protection.

<...to calculate the size of the cable for the load 1000 kW and the distance is 245m...>

It depends upon a lot of factors, including the country codes. In the UK it is covered by the latest edition of the Wiring Regulations, published by the IET.

http://en.wikipedia.org/wiki/Electrical_wiring