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#17519 - 11/27/02 10:03 AM Delta Transformer Configurations  
dturner  Offline
Member
Joined: Feb 2001
Posts: 18
Harrisburg PA USA
I need a quick refresher. When hooking up transformers in a DELTA configuration what are the pro's and con's (other than cost) of using "Closed Delta" or "Open Delta".


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#17520 - 11/27/02 06:15 PM Re: Delta Transformer Configurations  
electric-ed  Offline
Member
Joined: Jul 2002
Posts: 175
Canada
If one transformer of a delta-delta connected bank becomes defective, it can be disconnected, and the system will continue to function as an open-delta, but can only deliver 58% of its closed-delta rating.

In my area they were used when transformer insulation wasn't as good as it is today.

They used to install two transformers, connected open-delta, and add the third, (in other words "close the delta") at some point in the future when the load increased.

Ed



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