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  • Users: Roleci
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  1. Roleci

    What happens to the load current of healthy phase on L-L fault?

    As far as I know no ground current flows during line to line faults. But when there is a load current on healthy phase,it must flow as ground current according to the formula.Let’s Say there is b-c fault. I0= 1/3(Ia+Ib-Ic). In this case 3I0 equals to Ia which is the load current before fault...
  2. Roleci

    How to choose the short circuit power of a transformer to calculate the max.short circuit current ?

    I want to calculate the max short circuit current of a power transformer.But I'm confused about something.The rating power on the nameplate is 100 MVA but the transformer can be operated up to 110 MVA for short periods.In this case,what power should I choose to calculate the max. short circuit...
  3. Roleci

    How can i calculate the x/r ratio of YNd11 transformer ?

    Hello; We have a 125 MVA YNd11 380/33 kV transformer on the field.Low voltage side is connected to ground through a zig zag grounding transformer without a resistor.I want to calculate the x/r ratio of a L-G fault in order to find the decaying time of DC component.As far as I know there is no...

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