一起交流滤波器差动保护动作处理及分析

Processing and Analysis of an AC Filter Differential Protection Action

交流滤波器是直流输电系统中用于滤除谐波和补偿无功的重要设备,一旦发生故障,将影响直流系统的稳定运行。交流滤波器差动保护作为滤波器主保护之一,是滤波器安全稳定运行的前提之一。本文通过对一起由于滤波器光CT合并单元故障导致差动保护动作的实例进行分析,介绍了差动保护的动作原理和存在的问题,并提出相应的防范措施。

The AC filter is an important device in the DC transmission system for filtering harmonics and compensating for reactive power. Once a fault occurs, it will affect the stable operation of the DC system. AC filter differential protection is one of the main protections of the filter and one of the prerequisites for safe and stable operation of the filter. This paper introduces an example of the differential protection action caused by the failure of the filter optical CT merging unit, introduces the action principle and existing problems of the differential protection, and proposes corresponding preventive measures.