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  1. #1
    fio1022 Guest

    Default Understanding an Open-Delta Bank

    Hi all,
    I don't know where else to ask this question and I have been trying to find the answer for a while now(no one seems to know for sure).
    I am an apprentice lineman for my local utility company and I'm trying to understand how an open delta bank provides TRUE three phase power.
    A regular wye or closed delta bank has three transformers with three phases feeding the primary side, 3 phases in 3 phases out(3 different phase angles).An open delta only has two transformers with two primary feeds.2 phases in 3 out?I don't get it.
    Is an open delta bank secondary supplying true three phase power(120 degree phase shift)or is it two phases compensating for the lack of a third.
    Just wondering if I am far off track on my thinking...
    Any information is appreciated.

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