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Delta winding resistance

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    Delta winding resistance

    Does anybody break one of the connections on a delta winding when doing winding resistance? If you're injecting current and measuring voltage drop across H1-H3 for example you are still sending current up through H2, essentially putting 2 additional windings in parallel and not measuring the true resistance of any one winding. On our forms we do record the readings as H1-H2 etc but just wondering if anyone does it different.

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    Quote Originally Posted by phasor View Post
    Does anybody break one of the connections on a delta winding when doing winding resistance? If you're injecting current and measuring voltage drop across H1-H3 for example you are still sending current up through H2, essentially putting 2 additional windings in parallel and not measuring the true resistance of any one winding. On our forms we do record the readings as H1-H2 etc but just wondering if anyone does it different.
    Most transformer do not allow disconnecting of individual phases. You are using DC current so it shouldn't make a difference because the current is mostly flowing through the path of least resistance i.e. the single winding rather than having to travel through two windings. I thought about this before also but I have never heard of anyone disconnecting the other phases.

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