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  1. R

    SLG Fault Calculation at Bus3 (High Side Start Grounded - 33kV) for three winding Aux Transformer (Hand Calculation)

    Hi David, I have posted my hand calculations into this thread. Please let me know if you think if there is any error in the calculation. Regards, Rocky
  2. R

    SLG Fault Calculation at Bus3 (High Side Start Grounded - 33kV) for three winding Aux Transformer (Hand Calculation)

    Hi David, Please see response below:
  3. R

    SLG Fault Calculation at Bus3 (High Side Start Grounded - 33kV) for three winding Aux Transformer (Hand Calculation)

    1. Base Values at 33kV: Base MVA = 100 MVA Base kV = 33 kV Base Z = (33²)/100 = 10.89 Ω Base I = 100MVA/(√3 × 33kV) = 1749.8 A 2. Positive & Negative Sequence from Grid + TF1 side: Grid (referred to 33kV): Z1g = Z2g = (33²)/(50000×√3) × (1/100) = 0.1258 Ω X/R = 14 R = 0.1258/√(1+14²) =...
  4. R

    SLG Fault Calculation at Bus3 (High Side Start Grounded - 33kV) for three winding Aux Transformer (Hand Calculation)

    Can someone please help with solving Single Line to Ground fault current at the Bus3 (33kV) of the below single line diagram, single line parameters are as below: Grid: 3Ph Fault current 50kA, X/R =14 1Ph Fault Current 50kA, X/R =14 TF1: 285/142.5/42.5 MVA, 330/33/33 kV, Yn0d1d1 Positive...

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