Jinxinda Coal Industry Co., Ltd., Shanxi Coal Transportation and Sales Group

金辛达煤矿目前面临着越级跳闸及大面积停电的严峻问题,为解决高压供电系统越级跳闸问题,对供电系统现状和抗过负荷保护原则进行了分析,并基于光纤闭锁的高压电网短路保护原理,开发了保护装置的硬件电路以及控制程序,通过激活并触发下级开关设备的跳闸动作,以实现故障区域的快速隔离,确保电力系统的稳定性。性能测试实验结果表明,当输入电流为200A时,系统正常工作,未出现开关跳闸现象,当输入电流超过200A时,下级开关均在160ms时间内跳闸;若因某种原因下级开关设备未跳闸时,则预设的上级开关设备保护机制将在极短的162ms内自动启动,迅速切除故障段。双重保险措施大幅度降低了因故障引发的跳闸事故风险,研究成果可为矿井供电系统可靠性和安全性的提高提供参考。

Jinxinda Coal Mine is currently facing severe problems of override tripping and large-scale power outages. In order to solve the problem of override tripping in the high-voltage power supply system, an analysis of the current situation of the power supply system and the principle of anti overload protection is conducted, and the hardware circuit and control program of the protective device are developed based on the high-voltage power grid short-circuit protection principle of optical fiber atresia. By activating and triggering the tripping action of the lower level switchgear, the fault area can be quickly isolated to ensure the stability of the power system. The performance test results show that when the input current is 200 A, the system works normally without any switch tripping phenomenon. When the input current exceeds 200 A, all lower level switches trip within 160 ms time; If for some reason the lower level switchgear fails to trip, the preset protection mechanism of the upper level switchgear will automatically start within a very short period of 162 ms, quickly cutting off the faulty section. The dual insurance measures greatly reduce the risk of tripping accidents caused by faults. The research results can provide reference for improving the reliability and safety of mine power supply systems.