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Joined: Jul 2004
Posts: 787
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LarryC Offline OP
Member
I was looking at the classified ads on this site. Somebody has a bunch of pole transformers that have 240/480 secondaries.

In what application would they be used?

Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
I see these around mine sites quite a bit. Many mine sites use 240 or 480 3 phase Delta ungrounded systems as permitted by 250.21 (A)(4). These transformers could also be used for a corner grounded Delta.


Few things are harder to put up with than the annoyance of a good example.
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LarryC Offline OP
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OK, thanks.

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LarryC Offline OP
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Is 240/480 delta a common configuration for oil fields too?

Joined: Feb 2004
Posts: 1,438
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yes it is... 99% of the 480V running around the oil fields in western Kern Co, CA are ungrounded delta sec's. with delta primary on 12KV systems and Wye on 21KV systems


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