Comparison research on the calculation of short-circuit currents of IEC60909 and PSASP short-circuit module

IEC60909 is an international standard for the calculation of short-circuit currents prepared by International Electrotechnical Commission (IEC), which aims at establishing a general, practicable and concise procedure leading to results. Short-Circuit module(SC) in Power System Analysis Software Package (PSASP) is one of the most widely used programs for the calculating of short-circuit in China. This paper compares their similarities and differences in calculation content, assumptions, equipment model and arithmetic, then illuminates the reason of the different results by a testing example, and points out their different applied conditions.