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  • Users: rex2704
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  1. rex2704

    Interpreting transformer phase shift in SKM PTW software

    I am a little confused with how to interpret the transformer phase shift angle value in SKM PTW software. I want to represent a two winding, 3-phase wye-delta transformer in PTW. The details are as follows: Primary: HV, Wye connected Secondary: LV, Delta connected Vector Group: Yd1 (HV voltage...
  2. rex2704

    Testing Split Phase Protection CT

    I work for a utility in Canada. We have a split phase protection provided on a large AC generator. This protection has a current transformer with Shell type core. Please see the attached diagram for details. I wanted to perform a saturation test on this Current Transformer (CT). I know the...
  3. rex2704

    Ferroresonance on 6.6kV, Y0Y0 connected Voltage Transformers

    I work for a utility in Canada. I will first give some background on our network in question… We have 9MVA, 66kV/6.6kV, YND1 transformer. The HV side has a transmission line with the circuit breaker about 100kM away. The breaker probably performs only 3-pole operation. The LV side of this...
  4. rex2704

    Effect of Capacitor Banks on ground fault current

    I am working on a substation design using SKM power tools software (version 6.0). While working with the software, I have noticed that delta connected capacitor banks used for power factor correction give rise to ground fault currents in an ungrounded delta connected system. I had used a...

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