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高压电器  2014 

±800 kV楚雄换流站联网转孤岛调试引起的避雷器事故分析及对策

, PP. 126-130

Keywords: 孤岛调试,避雷器,事故分析

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Abstract:

2012年12月15日,±800kV云广直流输电工程开展功率水平为2500MW的孤岛调试,送端楚雄换流站由联网转孤岛时,在极1高端换流变分接头控制由定角度模式改为Udi0模式后,极1直流差动保护和低端阀短路保护先后动作,极1双阀组闭锁。经检查,发现极1低端阀厅M型避雷器压力释放损坏。笔者通过对比M型避雷器技术参数和解剖试验,得出避雷器损坏原因为由于10mA参考电流下的参考电压偏低,且各柱的电流不均匀系数偏大,在高低端换流变分接头控制模式不一致情况下,避雷器对地电压超过其10mA参考电压值,且该过电压作用时间较长,避雷器阀片能量来不及释放引起热击穿,进而导致避雷器压力释放损坏。建议提高避雷器10mA参考电压,降低内部各柱的电流不均匀系数,并且避免出现同一极高低端阀组换流变分接头控制方式不一致的运行方式。

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