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#200852 - 04/22/11 09:38 AM O/T pole pigs with 240/480 secondaries
LarryC Offline
Member
Registered: 07/05/04
Posts: 780
Loc: Winchester, NH, US
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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#200867 - 04/23/11 05:05 PM Re: O/T pole pigs with 240/480 secondaries [Re: LarryC]
Tom Offline
Member
Registered: 01/01/01
Posts: 1044
Loc: Shinnston, WV USA
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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#200872 - 04/23/11 06:45 PM Re: O/T pole pigs with 240/480 secondaries [Re: Tom]
LarryC Offline
Member
Registered: 07/05/04
Posts: 780
Loc: Winchester, NH, US
OK, thanks.
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#200880 - 04/24/11 06:25 PM Re: O/T pole pigs with 240/480 secondaries [Re: Tom]
LarryC Offline
Member
Registered: 07/05/04
Posts: 780
Loc: Winchester, NH, US
Is 240/480 delta a common configuration for oil fields too?
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#200881 - 04/25/11 12:00 AM Re: O/T pole pigs with 240/480 secondaries [Re: LarryC]
Lostazhell Offline
Member
Registered: 02/21/04
Posts: 1428
Loc: Bakersfield, CA (Originally Or...
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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