Detail mathematical solution for selecting cable for a 500kva transfomer

I found this link while searching one day, and I immediately printed off a copy for my use.

http://www.quanta-technology.com/

If this booklet cannot help you then I would be very surprised.

Hope that this meets your needs.

Hi,

Thank you very much for providing this link. it was a real feast. I really could not stop till I finished reading it. A good entertainment too with few very good jokes.

Hi,

Do you have another link to see the file? I think the link is broken. I'm looking for calculation or explanation in calculate cable size for transformer. Looking forward.

Thats why design consultants are exist.

Hi JOPENZ 107,

The selection of electrical cable is itself a vast subject. You should not expect to get a proper reply though this as it is not possible.During our refresher courses we had a specialised training on on the subject for a month. On completion of the training I felt the knowledge I gained through that one month course is not even a drop in the sea.So vast is the subject. I shall give you a rough idea.

Let us start with the selection of cable

1. Load (KVA rating of the load)

2. System Voltage , AC/ DC

3. Insulation,

4. Short circuit rating, Length of cable ,Permissible voltage drop

5. Mode of Installation and environment to be used ( Chemical Factory , Engineering factory,Cross country distribution, City distribution system, over head or underground,climatic conditions, Type of terrain. System earthed or unearthed.

6. The financial capacity of the user

7. Which specification to be followed ( BS , IEEE, ISI etc )

The list is more and all these factors are considered before selecting the required cable for a project.

Cable rating :EHT cable, HT cable , LT cable , control cable, Communication cable.RF cable,

The type of cable : PILC,PVC, XLPE , single or multi core.

Technical features

Type of conductor copper / aluminium Armoured / un armoured

If armoured type of armouring.

Maximum allowable temperature rise, continuous working temperature.

Cable de rating calculations depending on the site conditions and laying method,

Cable laying is itself will decide the life of cable. cable jointing and termination is another area.

Cable testing before and after laying

These all are basic knowledge which if I have explain it will take minimum weeks.

so do your home work first before putting your thread.