雷击灾害下多级串联闪络保护器断线故障控制方法研究

Study on the Control Method of Break-line Fault of Multi-stage Series Flashover Protector under Lightning Disaster

输送电线路的多级串联闪络保护器在雷击灾害下,容易出现断线、跳闸等情况,对人类的工作与生活造成较大的影响。为此,分析雷击及其雷击危害的性质,获得雷击对输送电线路多级串联闪络保护器产生的危害。计算多级串联闪络保护器故障点、电源侧与负荷侧正序、负序以及零序等数据,在故障点附近安装可调间隙保护装置先将雷电流导入大地,间隙间电弧会在电磁力和风力等外力的推动下,出现拉长形态后快速熄灭,以此控制断线故障程度,不出现严重损耗。对多级串联闪络保护器实行雷电冲击实验,研究结果表明,该种方法控制后放电路径处于间隙之间,在雷击灾害下,保护间隙能够保障绝缘子的绝缘安全性,有效避免多级串联闪络保护器断线故障导致炸裂等严重情况的出现。

Under the condition of lightning strike, the multistage series flashover protector of transmission line is easy to break the line and trip, which has a great influence on the work and life of human beings. In this paper, the properties of lightning strike and its lightning damage are analyzed, and the harm of lightning strike to multistage series flashover protector of transmission line is obtained. The fault point of multistage series flashover protector, positive sequence, negative sequence and zero sequence of power supply side and load side are calculated, and the lightning current is first introduced into the earth by installing adjustable gap protection device near the fault point. The gap arc will be driven by electromagnetic force and wind force and other external forces, and then it will be elongated and extinguished quickly, so as to control the degree of broken line failure. There is no serious wear and tear. The lightning shock experiment is carried out on the multistage series flashover protector. The results show that the discharge path is between the gaps after the control of this method, and the protection gap can ensure the insulation safety of the insulators under the lightning strike disaster. Effectively avoid multi-stage series flashover protector broken line fault resulting in cracking and other serious cases.