云广直流避雷器损坏故障分析及仿真  

Analysis and Simulation of the Metal Oxide Arrester Breakdown in Yunnan-Guangdong DC Project

作　　者：贾磊 蔡汉生 

机构地区：[1]南方电网科学研究院,广州510080

出　　处：《南方电网技术》2014年第2期19-23,共5页Southern Power System Technology

摘　　要：对2012年12月15日楚雄换流站发生的极I低端阀组M型避雷器损坏故障进行了分析并对故障工况下的24次谐波回路特性进行了研究。研究结果表明:此次故障中极I高、低端换流变分接头档位间较大的差别将导致回路中24次谐波含量的增加,同时由400 kV母线等效对地电容、换流器内电感和平波电抗器组成的串联回路将进一步放大回路中各点的24次谐波电压幅值,上述两个方面的原因导致M型避雷器对地电压升高至388 kV以上,吸收能量超过了其标称吸收能量,从而使避雷器发生损坏。Analysis on the M type metal oxide arrester（ MOA） fault in Chuxiong convertor station on September 15th,2012 and study on the characteristics of 24th harmonic loop under fault conditions are presented in the paper. The results show that 24th harmonic is increased due to the large difference of tap changer between upper 12-pulse converter transformer and lower 12-pulse converter transformer,meanwhile the 24th harmonic voltage amplitude are further enlarged in the series circuit composed by 400 kV bus equivalent capacitance to ground,converter internal inductance and smoothing reactor. Due to the above two reasons,voltage of M type MOA rises up to above 388 kV and the absorption energy exceeds its nominal value,hence,the MOA is damaged.

关 键 词：避雷器 分接头 谐波 换流阀组 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM862