配电网接地故障相主动降压消弧成套装置及其现场试验

中性点非有效接地配电网易发生间歇性弧光接地故障,产生过电压,危及人身设备安全,甚至引发电缆通道火灾。针对该问题,提出了接地故障相主动降压消弧控制原理与技术,研发了成套装置,通过灵活调控零序电压,控制故障点电压低于故障电弧重燃电压,强迫故障电弧自行熄灭,实现间歇性弧光接地故障的不停电消除,且有效抑制过电压。通过大量实验室测试、实际变电站实测与运行,验证了接地故障相主动降压消弧技术的正确性和可行性。

Arc suppression device with active reduction of grounding fault phase voltage and field test for distribution networks

Intermittent arc grounding fault often occurs in neutral non-effectively grounded distribution networks, resulting in overvoltage, endangering personal and equipment safety, and even causing cable channel fire disasters. Aiming at this problem, the arc suppression control principle and technology based on active reduction of grounding fault phase voltage are proposed, and the corresponding device is developed. By flexi-bly adjusting the zero-sequence voltage, the fault point voltage is controlled to be lower than the reignition voltage of fault arc to force the fault arc extinguish, so the grounding fault can be eliminated without power outage and overvoltage can be effectively suppressed. Through large amount of laboratory tests, actual sub-station tests and operation, the correctness and feasibility of the arc suppression technology based on active reduction of grounding fault phase voltage are verified.