Could someone please explain what value of resistance should be used in the plant impedance parameters when calculating the DC component of breaking current using the IEC60909 methodology for maximum short circuit current calculations. I understand the temperature should be at 20°C but I do not understand if I should enter the AC resistance or the DC resistance. The resistance needs to be entered for generators, cables and transformers. One of the problems with the software we use is that only cable data has fields for both AC & DC resistance. Transformers and generators have only a single field for resistance without any indication as to it being AC or DC.
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