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高压电器  2015 

云广特高压极I低端阀厅F5避雷器动作导致60EL-2动作分析

DOI: 10.13296/j.1001-1609.hva.2015.09.026, PP. 154-158

Keywords: 极差动保护,阀组短路保护,接地极,不平衡保护,闭锁,避雷器

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Abstract:

±800kV楚穗直流输电工程是世界上第一个±800kV特高压直流输电工程,输送容量为双极5000MW。该工程采用双十二脉动阀组串联接线方式,每个极包括高端阀组和低端阀组两个阀组。2012年12月15日楚穗直流楚雄换流站孤岛调试实验时,由于极I低端阀厅F5避雷器动作,导致极I极差动保护87DCM、阀组短路保护87CSDⅠ段与接地极线路电流不平衡保护60EL-2动作,极I双阀组闭锁。在以往直流工程中阀厅避雷器动作非常少见,并且涉及到动作的直流保护较多,文中着重分析阀厅F5避雷器动作为何导致接地极线路电流不平衡保护60EL-2动作,并提出今后直流工程接地极绝缘设计的一点建议,供大家参考。

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