The continuous rises of number of power grid equipment and complicacy of large power grids'structures result in frequent anomaly of secondary circuits'voltage and current and consequent external-fault-induced undesired activation of protections.Traditional manual analysis of external faults is inefficient and difficult to ensure accuracy.To address this is-sue,this article analyzes an undesired activation of external-fault-induced protection encountered by an actual 220 kV main transformer,studies the monitoring method for secondary circuit hidden danger,and develops an intelligent analysis sys-tem.The system can identify anomalies in secondary circuits of protection devices through anomaly detection method,help to timely discover hidden dangers of relay protection,and effectively improve correctness rate of protection action.
维普
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