低压厂用电系统零序TA接线方法的选择

Chosen of Connection Method of Low Voltage Auxiliary Power System Zero Phase-sequence TA

介绍低压厂用电系统3种零序TA的接线方法,以及某电厂零序TA采用全电流接线法引起的零序过流保护的误动作情况,分析在"相-地"和"相-N"2种单相短路故障时,各接线方法的零序电流及零序过流保护动作情况,认为零序TA接线宜选用三相电流接线法。

The connection methods of 3 kinds of zero sequence TA in LV auxiliary power system are introduced, and including the zero sequence overcurrent protection mal-action situation with complete current connection methods of some power plant. During phase-ground and phase-N single phase short circuit fault, zero sequence current and zero sequence overcurrent protection action are analyzed, the conclusion is got that three phase current connection methods are used for zero sequence TA connection.