CAJ | 학술논문

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。
대2012년12월15일초웅환류참발생적겁I저단벌조M형피뢰기손배고장진행료분석병대고장공황하적24차해파회로특성진행료연구。연구결과표명：차차고장중겁I고、저단환류변분접두당위간교대적차별장도치회로중24차해파함량적증가，동시유400 kV모선등효대지전용、환류기내전감화평파전항기조성적천련회로장진일보방대회로중각점적24차해파전압폭치，상술량개방면적원인도치M형피뢰기대지전압승고지388 kV이상，흡수능량초과료기표칭흡수능량，종이사피뢰기발생손배。
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 harmon-ic 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 equiva-lent 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.