Under all parallel AT power supply mode,the wide area protection for the intelligent traction substation only cuts off the line at the fault side,however,the power of traction network at side of non-fault line is not cut off.The paper,on the basis of the analyzing the current characteristics of substation,AT post and sectioning post under all parallel AT power supply mode,puts forward the criteria for fault direction identification of wide area protection based on the principle of different current ratio of up and down track,it is able to narrow the scope where the fault direction is impossible to be identified by the wide area protection when breakage of PT line is occurred.And it has improved the selectivity of wide area protection.
differential current ratio of up and down trackwide area protectionall parallel AT power supply mode
NETL
NSTL
万方数据
