การพัฒนารูปแบบการสื่อสารข้อมูลของรีเลย์ระยะทางบนพื้นฐานระบบการป้องกันแบบพื้นที่กว้างสำหรับระบบส่งไฟฟ้า

Abstract

Distance relays are used as primary protection devices for protecting transmission lines. If a fault occurs within the protection zone, it will send a signal to eliminate the fault from the network. In traditional protection, the protection zone is limited. The transmission line protection cannot be determined to cover the entire length of the transmission line because distance relay calculates short-circuit impedance values using local measurement data standalone. In addition, the connection of the distributed generation reduces the protection zone of the distance relay. The distributed generation increases system voltage. The fault resistance seen with the distance relay will be increased. For the above reasons, it can lead to under-reach problems and miscoordination problems. Wide Area Protection is protection that used the principle of data exchange of protective equipment. All protection devices exchange information to monitor and solve problems to increase the reliability of the protection system. In this thesis, the development of distance relay communication based on wide-area protection using operation signal for transmission system is presented. The proposed algorithm detects faults using a centralized system. The centralized system collects protection zone information from distance relays within the network to identify a fault. The results represent that the proposed algorithm can overcome such problems and improve the stability and reliability of the system.