光纤闭锁式防越级跳闸保护装置
Protector for Preventing Override Trip Based on Optical Fiber Locking Control
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摘要: 针对煤矿井下高压供电系统的越级跳闸事故以及现有防越级方案存在的问题，提出了一种光纤闭锁控制的防越级跳闸保护方案。以典型的矿井供电系统为例，分析了光纤闭锁式煤矿井下高压电网短路保护原理，设计了防越级跳闸保护装置硬件电路，开发了控制程序，并对该保护装置进行了性能试验。试验结果表明，该方案可实现煤矿井下高压电网上下级开关的配合，解决了过电流保护的选择性问题，有效防止了越级跳闸故障发生，提高了矿井供电的可靠性、安全性和连续性。Abstract: In order to solve the problem of override trip in high-voltage power supply system of coal mine, a new scheme for preventing override trip was proposed based on optical fiber locking control. Referring to a typical mine power supply system, the short circuit protection principle of high-voltage grid based on optical fiber locking was analyzed. The hardware circuit, as well as the control procedures of protection devices was developed, and the performance experiments were carried on. It has been shown that the scheme can figure out the coordination between switchgears in high-voltage power grid of coal mine by experiments, and can solve the selective problem of over-current protection. In addition, the override trip fault can be prevented effectively. Therefore, with the scheme proposed in this paper, the reliability and safety of the mine power supply system can be improved．
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Keywords:
- coal mine power supply /
- power supply system /
- override trip /
- optical fiber /
- protector
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