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Considering about an accident caused by protection maloperation
Author(s): 
Pages: 10-11,15
Year: Issue:  2
Journal: GUANGXI ELECTRIC POWER

Keyword:  继电保护电压互感器三次回路短路误动;
Abstract: 文章通过对某变电站发生的一起由于电压互感器三次回路短路,造成保护区外故障误动事故的调查与分析,提醒专业人员在工作中应注意对电压互感器三次回路进行验收和检查,严格执行<电力系统继电保护及安全自动装置反事故措施要点>中:来自电压互感器二次的4根开关场引入线和互感器三次回路的2(3)根开关场引入线必须分开,不得共用,确保回路正确,避免保护误动的有关规定,才能防止互感器三次电压串入电压二次回路,避免造成区外故障时保护误动或区内故障时保护拒动.
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