disconnect and protection after the transformer

[arvinolga]

hi! just a question, are the following options acceptable for a disconnect/protection of the transformer secondary rated 2MVA 13.8/0.230kV:
1. 5000A load break switch only
2. 5000A ACB with LISG
3. no main breaker, bus only
4. two 2500A main breakers

thanks
Arvin

 

[kevinsarnold]

Re: disconnect and protection after the transformer

A couple of things to consider:
1. Sizing of the OCPD for transformers primary and/or secondary is based upon NEC 450.3.
2. What is the available fault current (short circuit current) at this point where the protective device is being placed?

If you would like, you can send details over to our engineering group and they will be able to assist you.
Sincerely,
Kevin S. Arnold, P.E.

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[ September 08, 2005, 10:38 AM: Message edited by: charlie b ]