This paper focuses on an actual case of undesired action of the programmed adverse power protective trip after the fault-induced activation of the main relay of a certain excitation transformer.It first briefly summarizes the possible reasons causing the tripping of programmed adverse power protection.It then analyzes the activation processes of pro-grammed adverse power protective trips in various practical cases,including the aforementioned one and others,according to the tuned protective threshold values and the calculated power values after main relay activation,and gives the corre-sponding conclusion as well as the countermeasures.The proposed countermeasures have found practical application and showed satisfactory utility.
关键词
现场事故/程跳逆功率保护/案例分析/解决方案
Key words
on-site accident/adverse power protection of programmed trip/case analysis/solution
维普
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