Research on online monitoring and early warning technology of tripping and closing circuit of intelligent substation

Abstract

In view of the lack of effective on-line monitoring means for the tripping and closing circuit and the problem that the tripping and closing circuit mistakenly opens and closes the primary equipment due to excessive leakage current, an on-line monitoring and early warning scheme for the tripping and closing circuit is proposed, and an online monitoring and early warning system for current data and switch state data of the tripping and closing circuit is designed. Hall current sensors are installed at many places of the tripping and closing circuit to collect the leakage current in real time. Relying on the sampling unit and management unit of intelligent wave recorder, the online monitoring and early warning system digitally collect, analyse and process the information of tripping and closing circuit, realize the fault early warning and positioning of tripping and closing circuit, and improve the ability of circuit anomaly monitoring and early warning. Through the field application in substation, the feasibility of the system is verified.