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  • Users: jlazucena
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  1. jlazucena

    How to increase switchgear's short circuit capacity?

    I have a Siemens switchgear with the nominal values of 15kV, 3000A and 750 MVA short circuit capacity at old STD C37.06-1987. There is cell available with only 500 MVA short circuit capacity (K factor 1.3)with the same nominal voltages and currents. Problem: The expected 3phase sc current is...
  2. jlazucena

    Grounding of 3 winding transformer

    I have a 3winding-50MVA wye,wye,delta power transformer. Ho is grounded through a surge arrester, Xo is grounded through a ground resistor and one point of the delta is solid grounded. The delta winding is only for grounding. I would like to solid ground Ho How can I model this...

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