Development of a Novel Comprehensive Online Monitor for MV Switchgears Based on Modbus

This paper describes the development and design of a novel online detector for condition monitoring of switchgears based on Modbus technology. The equipment is based on host-and-slave structure. Each salve module, which collects different sensed information such as mechanical condition, partial discharge and temperature, is installed on the target switch gear cabinet to comprehensively monitor all the connected switchgears in the substation. Once there is any potential faults happened, the defective switch cabinet can be automatically picked out by the host. Overall system construction and its practical application are proposed.