一起750 kV串抗引起线路保护测距异常的机理分析及改进措施

Analysis and improvement of the anomaly of the line fault location of the protection device caused by 750 kV series reactor

针对750 kV带串抗线路跳闸时引起常规线路保护测距不准确的问题,对单、双端保护测距原理进行了系统介绍,深入分析了串抗对保护测距的影响。利用实例分析、数据计算进行了异常重现,充分验证了带串抗线路跳闸时保护测距结果与实际距离存在显著误差,致使保护测距结果不具备参考意义,并且提出了提升带串抗线路故障定位的有效改进措施,为变电站带串抗线路故障测距设计、调试和运维等方面提供参考。

Aiming at the inaccurate problem of the routine line protection fault location when the line together with 750 kV series reactor trips,systematically introduces the principle of single and double side protection fault location,deeply analyzes the effect of series reactor on protection fault location,and the anomaly is reproduced by example analysis and data calculation.It is verified the appreciable error between the results of protection fault location and the actual distance when the line together with series reactor trips,and the results of protection fault location do not have reference.It puts forward a series of effective improvement measures to optimize the line fault location with series reactor.it can provide the reference of the design and debugging,operation and maintenance for the line fault location with series reactor in the follow-up substation.