±800kV换流站MRTB防跳缺陷及改进措施

Defects and Improvement Measures of MRTB Anti Tripping in ±800kV Converter Station

特高压直流MRTB开关主要用于直流金属回线至大地回线运行方式的转换上,在一些特定情况下会出现开关的异常跳跃,MRTB跳跃次数过多很可能导致振荡回路避雷器损坏甚至爆炸。为此,在分析±800 kV换流站MRTB开关防跳原理基础上,提出了3种改进措施并进行了优劣性对比,选出最优化方案。该方案应用于±800 kV楚雄换流站工程,解决了MRTB开关的异常跳跃现象。

UHVDC MRTB switch is mainly used for the operation mode conversion from DC metal return line to earth return line, and the switch will trip abnormally in some specific cases. Too many trips of MRTB may lead to damage or even explosion of surge arrester in oscillation circuit. Therefore, on the basis of analyzing the anti-tripping principle of MRTB switch in ± 800 kV converter station, three improvement measures are put forward, and the advantages and disadvantages are compared to select the optimal scheme. The scheme is applied to Chuxiong ± 800 kV converter station project and solves the abnormal tripping phenomenon of MRTB switch.