Research of electromagnetic compatibility of condition on-line monitoring device for medium voltage switchgear

A condition on-line monitoring device for medium voltage switchgear is designed. The minimum system of the control circuit is the ADuC842. The parameters such as insulation leakage current, bus temperature, mechanical status, and switch status of switchgear are monitored, which provides the basis and reference for understanding the potential fault and analysis of fault. For the electromagnetic interference existing around the switchgear, from both hardware and software, kinds of anti-interference measures are taken to enhance the electromagnetic compatibility, which makes it successfully pass the national EMC 4 level standards. Research result is of great significance for improving operation reliability of the switchgear, and further security and stability of power system.