基于光纤通信的防越级跳闸方案设计和应用

为了防止煤矿电网越级跳闸,在传统矿用微机保护的基础上,设计出一种基于光纤通信的矿井电网防越级跳闸保护系统。该系统依靠发送光纤闭锁信号,闭锁上级线路速断跳闸,实现防越级跳闸。在发生速断故障时,保护装置利用光纤通道,能对其上级线路快速发送跳闸闭锁信号,并实现上级线路保护动作时间阶梯化,防止越级跳闸。系统测试表明,该方案能够有效防止上级线路越级跳闸,提高了煤矿电网运行的安全性和稳定性,并证明了该方案的正确性和有效性。

Design and application on preventing override trip system based on fiber-optic communication

To prevent the override trip of mine electric power network, a scheme of preventing override trip system based on fiber-optic communication is proposed. The system depends on sending fiber block signals, and blocks superior line quick-break trip to achieve anti override trip. When the quick-break fault occurs, relays send blocking signals by using optical fiber to the upstream ones, and the time of quick-break protection will be changed automatically, to prevent the override trip. System test shows that, this scheme can effectively prevent the override trip and improve the operation of mine electric power network security and stability. And the correctness and effectiveness of the proposed scheme is proved.