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#200852 - 04/22/11 12:38 PM O/T pole pigs with 240/480 secondaries  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
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 08:05 PM Re: O/T pole pigs with 240/480 secondaries [Re: LarryC]  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
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 09:45 PM Re: O/T pole pigs with 240/480 secondaries [Re: Tom]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
OK, thanks.


#200880 - 04/24/11 09:25 PM Re: O/T pole pigs with 240/480 secondaries [Re: Tom]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
Is 240/480 delta a common configuration for oil fields too?


#200881 - 04/25/11 03:00 AM Re: O/T pole pigs with 240/480 secondaries [Re: LarryC]  
Lostazhell  Offline
Member
Joined: Feb 2004
Posts: 1,429
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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