抄録
Microprocessor-based protection relay has been developed in 1980. It is widely applied to both HV and EHV system by means of an improvement on electronic components and data transmission system pro-vided with higher capacity and reliability.
Improved relaying system for the next generation is expected to have higher performance for the discrimination of the fault, functions for multi-purpose use of acquired data, easy operation and maintenance, and also have friendly man-machine interface. From these prospects, we developed ad-vanced digital protection relay for the next generation.
This paper describes the improvements in operability and maitainability of the developed relay. Also, the configuration of human-machine interface and its advantages by applying a flat display panel with touch sensor for easy operation are explained.
