交流滤波器开关三相不一致保护拒动原因分析

Analysis of Reasons for Rejection of Three-phase Inconsistent Protection of AC Filter Switch

本文针对某直流换流站无功自动投入滤波器过程中出现的330kV交流滤波器开关本体三相不一致保护未动作的情况,分析了拒动原因,发现其时间继电器故障。在试验过程中进一步发现了开关合闸线圈及合闸一级阀存在老化重大隐患,及时提出了改进措施,提高了开关运行的可靠性。

In the process of reactive power automatic input of the filter of a DC converter station,the three-phase inconsistent protection of the 330 kV AC filter switch body has not been actuated.The reason for the rejection is analyzed,and the time relay fault is found.In the test process,the switch closing coil is further found to have significant aging hazards,and timely improvement measures are put forward to improve the reliability of the switch operation.