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 O/T pole pigs with 240/480 secondaries
#200852
04/22/11 11:38 AM
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Joined: Jul 2004
Posts: 783
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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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Joined: Jan 2001
Posts: 1,044
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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.
Few things are harder to put up with than the annoyance of a good example.
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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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Joined: Jul 2004
Posts: 783
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Re: O/T pole pigs with 240/480 secondaries
[Re: Tom]
#200880
04/24/11 08:25 PM
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Joined: Jul 2004
Posts: 783
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Is 240/480 delta a common configuration for oil fields too?
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Re: O/T pole pigs with 240/480 secondaries
[Re: LarryC]
#200881
04/25/11 02:00 AM
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Joined: Feb 2004
Posts: 1,437
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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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