110kV线路绝缘子式避雷器方案分析及仿真验证

Design and Simulation of the Lighting-protective Insulator for 110 kV Transmission Line

高压输电线路上绝缘子起着支持导线和防止电流回地的作用,但在输电线路遭受雷击或操作过电压时绝缘子可能会发生闪络,严重的会导致其被烧伤、击碎。为确保绝缘子能正常工作,目前主要采用的方法是在线路上将避雷器与绝缘子并联。由于避雷器重量及体积较大,将避雷器和绝缘子并联安装使线路和铁塔的负荷增大,线路设施复杂化,另外,铁塔横担处设备较多也会给带电作业等工作带来不便。如果绝缘子和避雷器能够统一在一台设备上就可以解决上述问题。文中根据这种实际需要,对绝缘子式避雷器的方案进行分析设计,并对绝缘子式避雷器进行电场优化设计,再进行机械性能仿真验证,上述设计和验证结果显示满足绝缘子和避雷器能够统一在一台设备上的要求,最后得出结论,可以设计一种满足使用要求的110 k V线路绝缘子式避雷器。

The insulator of a high-voltage transmission line supports the wire and prevents the current from flowing back to the ground. However, flashover may occur on it when transmission line is subject to lightning or operation overvohage, and it may even be burned or crushed. To ensure safe work of the insulator, the insulator is usually paralleled with an arrester, whereas this parallel layout will increase the load of line and tower due to the large volume and weight of the arrester, and will make transmission facility complicated. In addition, additional equipment on tower arm will result in inconveniency in installation of the arrester. In this paper, an lighting-protective insulator is designed, its electric field is optimized, and simulation is performed to verify its mechanical properties. The results show that this integrated device can meet the requirements for both insulator and arrester. It is concluded that the lighting-protective insulator for 110 kV transmission line is feasible.