220kV两相运行短路电流的分析与比较

Analysis and comparison of short-circuit current during 220 kV two-phase operation

采用中国电力科学研究院EMTP程序,分析了220kV两相不平衡运行的电气化铁路系统发生单相及两相接地时,故障相和非故障短路电流分布规律,并对其进行了量化比较。指出,输电线路在两相供电运行方式下,其最大短路电流出现在输电线路末端两相接地时,其电流有效值与三相供电方式下的末端单相接地时短路电流有效值接近。

Quantative analysis and comparison were made using China Electric Power Research Institute EMTP program with faulty and non-faulty phase short-circuit current distributions while single or two phase earthing occurred in the electrified railway system during 220 kV two-phase unbalanced operation.It is pointed out that in the two-phase power sapply mode,the maximum short-circuit current of power supply lines occures when the ends of power supply lines are two-phase earthed,and the valid value of its current is close to the valid value of short-circuit current while the ends in the three-phase power supply mode are single-phase grounded.