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O/T pole pigs with 240/480 secondaries #200852 04/22/11 11:38 AM
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LarryC Offline OP
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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?

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Re: O/T pole pigs with 240/480 secondaries [Re: LarryC] #200867 04/23/11 07:05 PM
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Tom Offline
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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.


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Re: O/T pole pigs with 240/480 secondaries [Re: Tom] #200872 04/23/11 08:45 PM
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LarryC Offline OP
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OK, thanks.

Re: O/T pole pigs with 240/480 secondaries [Re: Tom] #200880 04/24/11 08:25 PM
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LarryC Offline OP
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Is 240/480 delta a common configuration for oil fields too?

Re: O/T pole pigs with 240/480 secondaries [Re: LarryC] #200881 04/25/11 02:00 AM
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Lostazhell Online Happy
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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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