中文摘要：

针对国内40.5 kV真空断路器应用于开断并联电抗器时绝缘事故多发的情况,进行了一系列现场试验,并对几种常见的不同原理及型式的过电压保护装置进行了分析和比较。研究结果显示,保护装置除了要考虑相对地保护,更要考虑相间过电压抑制。对于所述工况,可有效限制相对地、相间过电压的保护装置包括无间隙组合式MOA、3间隙组合式MOA以及阻容保护,且对于阻容保护,接在电抗器侧效果要明显好于接在开关侧。分析比较结果对于实际应用具有一定的指导意义。

英文摘要：

In view of frequent overvoltage failures of 40.5 kV vacuum circuit breakers switching off shunt reactors in China,a series of field experiments were carried out,as well as comparison of several common protectors.The results indicate that,it is even more important to suppress overvoltages between phases than those between phase and ground.For conditions of this paper,protections which can effectively suppress both phase-to-ground and interphase overvoltages are： gapless combined MOA,three-gap combined MOA,and R-C protection.And it is much better while R-C protection installed at reactors than that installed at switchgear.The results of this paper have guiding meanings for applications.