Abstract
As electric energy demand has been increasing year after year, a power system tends to increase its capacity and become complicated. This tendency has made it difficult to properly design a protection system for power system equipment. Especially, since transmission lines spread over a vast area, most of faults which exist in a power system occur on them. Therefore, transmission line protection is necessary to deploy protective relays and determine its setting values corresponding to the configuration of a power system.
This paper is to propose an expert system for transmission line protection whose knowledge base is extracted from two criteria for the purpose of guiding protection engineers and their knowledge. The main object of this expert system is to fully assist protection engineers in the transmission line protection. It involves the determination of protective relaying systems, deployment of relays, the determination of CT turns ratios and relay setting calculations. The proposed system is applied to a part of the Chugoku Electric Power Company System to verify its advantages.
