| Abstract: | in fault calculation of electric power system, it is necessary to calculate ground short-circuit on one of a couple of paralleled lines with zero sequence mutual-inductance so as to calculate the motion current of zero-sequence current protection and check its sensitivity.In this case, applying mutual-inductance extinguishing method to rectifying joint impedance matrix can decrease manual treatment to original branch messages, and it is also unnecessary to pre-give fault point. When it is necessary to calculate ground short-circuit of several fault points of the median in a line belonging to a couple of paralleled lines, or when there are several couples of paralleled lines with zero sequence mutual-inductance in a electric power system, this method can obviously decrease the numbers of junction points. It is simple in program composition, and convenient in use. This method possesses certain reference and enlightenment effect and practical value. |
