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Reason Analysis and Treatment of PLU Protection Maloperation
Author(s): 
Pages: 73-77
Year: Issue:  2
Journal: Guangxi Electric Power

Keyword:  功率负荷不平衡保护(PLU保护)保护误动动作逻辑;
Abstract: 分析某电厂两起机组PLU保护误动导致机组解列事件的原因,并探讨相应的解决措施.通过结合该型号PLU保护原理、动作逻辑、故障录波及实测数据,分析事件原因及影响因素.结果得出:对于发变组-线路单元接线方式,电气送DEH“并网信号”接线设计存在问题导致PLU保护误动;受到外部不平衡故障扰动时,该型号PLU保护有可能会误动.机组PLU保护在投运前,应对接线、动作逻辑、装置原理进行充分论证,消除PLU保护误动影响因素.
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