热倒母线操作中的隔刀可靠拉合检测与防误操作预警一直是变电站日常运维中的难题。提出基于差动原理的隔刀电流计算方法，研究不同系统运行方式、隔刀接触电阻对隔刀电流分配、三相不平衡程度的影响，充分利用母联间隔、线路间隔的状态信息，构建基于隔刀电流、母联间隔三相不平衡度的预警判据，结合母差保护、后台监控系统等研究热倒母线操作远程预警技术，通过改进常规站、智能站母差保护模型，五防系统对热倒母线操作中的隔刀拉合不可靠问题进行预警，通过仿真、实际变电站运行数据验证了该方法的可靠性、安全性。%Reliable pull-up detection and prevention of misuse warning in the operation of heat-drop bus has been a difficult problem of daily operation and maintenance of substations. In this paper, a computation method is proposed based on research on influence of system operation and contact resistor on switch currents and unbalance of three phase. With state information in bus coupler and transmission line collected, a remote forewarning method for bus switching is studied based on switcher current and degree of three-phase unbalance. The technology combined with bus protection and background monitoring system, is integrated in the model of bus protection of traditional substation or smart substation, and installed in five-anti system to forewarning the danger in bus switching. The reliability of the method is verified by simulation and operation data of actual substation.
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