关于500kV输电线路光纤保护通道的优化方案

Optimization Scheme of Optical Fiber Protection Channel for 500 kV Transmission Line

光纤作为纵联保护的通信通道,它具有传输速率高、抗干扰能力强、安全性好,可靠性高的特点,在500 kV的输电线路中得到广泛使用。介绍了纵联保护的原理、几种保护通道的特点、光纤作为保护通道的特点和继电保护装置与光纤通道的几种连接方式。根据光纤纵联差动保护在山东电网500 kV输电线路中的应用中所遇到的关于光电转换装置的问题,提出对现存保护通道的改进方案,以提高保护的正确动作率,确保电网安全稳定运行。

Fiber optic cable as a longitudinal protection of the communication channel,it has a high transmission rate, anti-interference ability, good security, high reliability characteristics, in the 500kV transmission lines are widely used. This paper introduces the principle of the protection of the vertical link,the characteristics of several protection channels,the characteristics of the optical fiber as the protection channel and the connection of the relay protection device and the fiber channel. According to the problems encountered in the application of optical fiber longitudinal differential protection in the 500kV transmission line of Shandong power grid, the improvement scheme of existing protection channel is put forward to improve the correct operation rate of protection and ensure the safe and stable operation of power grid.