Patent ID: RE40037

Claim:
An electric power system protection and control system, comprising: a plurality of protection controllers and control terminals , each for executing protection and control of an electric power system by inputting a status quantity; and a power system monitoring and control host connected to each of said protection controllers and control terminals via a communication network, for monitoring and controlling an operation of said power system based on information sent from said protection and control terminals; each of said protection controllers and control terminals comprising: a correlation processing unit having a CPU and a memory unit, which are connected within the protection and controller, the correlation processing unit correlating the operation state changes of two-way switch operations and protective relay operations, facilitating accurate time-point stamping of state change data and eliminating any order switching between relay and CB operation state changes; and sending means for sending result of said correlating means correlation processing unit to said protection and control terminals power system monitoring and control host via said communication network, respectively; and said power system monitoring and control host comprising: receiving/displaying means for receiving said result of said comparing means correlation processing unit via said communication network and displaying said result of said comparing means correlation processing unit .