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  • Users: MurrayBall
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  1. MurrayBall

    Ungrounded Transformer Causing VS Drive Problems

    Transformer is rated 3500kVA 25kV/480Volts Delta-Delta. Ungrounded delta secondary is causing variable speed drive problems. Please recommend best means to ground this transformer.
  2. MurrayBall

    Transformer Primary 51N Relay Tripping

    Transformer: 3750kVA Primary: 12.47kV Wye solidly grounded(connected to the utility line). Secondary: 2400V Delta Experiencing occasional 51N trips, that is, primary neutral current. 51N relay picks up at 2.0A. 51N current all the time about 1.0A; with 300:5A CTs equates to 60A primary. One time...

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