AT所差动电流保护整定方法

AT Post Differential Current Protection Setting Method

对石太客运专线牵引供电系统AT所差动电流保护的基本原理进行了简要介绍。对AT所上下行联络开关闭环和开环时的正常负荷电流、励磁涌流、短路电流分配情况及影响强度进行了比较详细说明。对AT所差动电流保护装置的误动作情况进行了分析,指出差动电流保护装置误动作的原因。利用理论分析和实际测试的方法,介绍了AT所差动电流保护应该采取的整定原则、整定方法和计算公式,并对新的整定值进行了可靠性论证。从而提出了完善AT所差动电流保护装置接线和增加相关继电保护的建议。

Briefly introduces the basic principles for AT post differential current protection of traction power supply system in Shijiazhuang-Taiyuan passenger dedicated lines. Explains in details the normal load current, exciting surge current, short circuit current distribution and degrees of influence when the contact switches of AT post for up and down lines are in closed loop or open loop status. Analyzes the miss operation status of AT post differential current protection, puts forward the causes of differential current protection miss operation. By means of theoretical analysis and real test, introduces the setting principles, setting method and calculation formula that shall be taken for AT post differential current protection, and re-illustrates the reliability of the new setting values. Thus puts forward the suggestions on perfection of AT post differential current protection wiring and adding associated relay protection.