Fiber-based Communications Regional Protection In The Feeder Automation Application

Feeder automation is important for improving the reliability of power supply distribution network of the city. Now the more mature technology is divided into centralized and decentralized. Central is based on the coordination of computer communication network and feeder terminal module. When the distribution line faults, Feeder terminal module each will this time their collected information uploaded to the distribution automation master station computer center. The computer through their own preset logic, make the fault section judgement, The switch then master control command operation fault area to isolate the fault. Decentralized is based on the cooperate between distribution automation terminal module. The terminal module need multiple reclosing can isolate the fault area. But the Power supply can’t restored fault isolation ends.In view of the disadvantages above two kinds of principles, proposes a distribution area protection principle based on optical fiber communications, According to the principle of developed area protection device of a new generation of feeder. The main features of the regional protection is the use of the optical fiber communication to link all feeder terminal device associated with the terminal are hand in hand together. Some important information can be shared in the optical fiber communication network. So establishing communication system between each feeder terminal. Due to the characteristics of distribution network is the city for ring network mode, normal operation is a single ended power supply, the other end of the power reserve. If at any point fault feeder, the regional protection to power network reorganization accurate and fast fault isolation and fault isolation after the end of the line. To minimize power range and timely for external fault and restore the power supply of the distal.According to the regional protection requirements, design the feeder terminal module distribution function. Mainly discusses the basic principle and action process of network reconfiguration of the fault isolation.Regional protection of optical fiber communication based on FTU feeder terminal module is based on MCF5275and MCF51AC256chip as the core, Using standard C language for the modular programming, the realization of feeder automation function.In the distribution network simulation laboratory testing of a full range of change regional protection automation system, Simulation of the feeder fault under various conditions. Test results show that the design is simple, feasible and easy expansion.