Main Points in PLC-based Maintenance Methods for Protective Relay Secondary Circuits in Smart Substations
The continuous promotion and application of electronic technology raise the electricity demand,which promotes the development of power industry while also poses higher requirements for operation quality of substations.As the core hub connecting power plants and electricity users,substations play an irreplaceable role in the entire power grid system. Dependable work of maintenance and repair of substations is of crucial significance for ensuring grids'safe operation.A-mong the various equipment in substations,secondary circuits of protective relays suffer relatively high failure rate.This paper outlines the concept of protective relay secondary circuit and explores the troubleshooting method based on PLC technology.It may contain technological information useful for relevant personnel.