光学电流互感器在电力系统应用中出现的问题及处理方法

Issues and solutions of optical current transducer used in power system

由于光学电流互感器OCT(Optical Current Transducer)出现扰动而使交流滤波器差动保护跳闸事件,对OCT在电力系统现场运行中使用出现的问题进行了研究,结合换流站OCT数据采集原理分析了事故发生时的设备故障原因,从而得出3种解决方案,即修改接口板、信号传送板;提高定值,躲过导致故障的尖脉冲;以及通过修改软件,在软件中判断过滤掉尖脉冲。并根据实践找到各种方法的可行性,最终提出可靠的处理方案。

Because of disturbances of the OCT（Optical Current Transducer） , the AC filter differential protection tripped improperly. Issues of the OCT application in power systems are researched,and the failure cause is analyzed combined with the OCT data acquisition principle in a converter station. Three solutions are achieved：the improvement of interface board and signal transmission board;the modification of settings to avoid the spike pulse leading to fault ;the software enhancement to filter the spike pulse. Their feasibilities are discussed and a reliable scheme is presented.