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O/T pole pigs with 240/480 secondaries #200852 04/22/11 12:38 PM
Joined: Jul 2004
Posts: 783
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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?

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Re: O/T pole pigs with 240/480 secondaries [Re: LarryC] #200867 04/23/11 08:05 PM
Joined: Jan 2001
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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.


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Re: O/T pole pigs with 240/480 secondaries [Re: Tom] #200872 04/23/11 09:45 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 09:25 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 03:00 AM
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Posts: 1,431
Lostazhell Offline
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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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