31 / 2021-05-24 22:38:06

高压输配电绝缘子异常侵害防护及机理研究

摘要：绝缘子在变电站及输配电线路中可实现电气绝缘和机械固定等作用，其在户外运行时常遭受雨雪、风沙、鸟害、异物附着等侵害，特殊情况下也遇到导电异物的附着，其中石墨纤维导电丝搭接为异物附着的类型之一，若无预设防护措施，将对绝缘子的正常运行造成较大破坏。本文建立了棒形悬式复合绝缘子及盘形悬式瓷绝缘子有限元三维仿真模型，在多物理场热电耦合下模拟计算绝缘子电场及温升分布，后对其在表面异常搭接附着石墨纤维情况下的外绝缘性能进行仿真分析，根据两类绝缘子结构差异及石墨纤维丝实际搭接附着情况，依照石墨纤维丝搭接方式、附着位置、附着程度进行分类仿真计算，研究绝缘子电场分布变化，数值可反映绝缘子电场畸变程度，从而对不同情况下的绝缘子外绝缘性能做出判断，为绝缘子实际运维、防护提供参考。



关键词：石墨纤维；绝缘子；热电耦合；绝缘防护；多物理场



Abstract: Insulators can achieve electrical insulation and mechanical fixation in substations, transmission and distribution lines. They often suffer from rain, snow, wind, sand, bird damage, foreign body adhesion and other violations when operating outdoors. In special cases, insulators also encounter the adhesion of conductive foreign bodies, in which graphite fiber conductive wire lap is one of the types of foreign body adhesion, it may cause tremendous damage to the normal operation of the insulator extremely if there are no pre-set protection measures. In this paper, the three-dimensional finite element simulation models of rod suspension composite insulator and disk suspension porcelain insulator were established. For constructive purposes, the distributions of electric field and temperature rising of insulator were simulated and calculated under multi-physical field thermoelectric coupling. Then, the external insulation performance of insulator with abnormal lapping and adhesion of graphite fiber was simulated and analyzed. According to the overlapping mode, attachment position and attachment degree of graphite fiber wire, the simulation calculation was carried out to study the variation of electric field distribution of insulator. Conclusively, the numerical value can reflect the degree of electric field distortion of insulator, so as to judge the external insulation performance of insulator under different conditions, and provide reference for the actual operation, maintenance and protection of insulator.



Keywords: graphite fiber; insulator; thermoelectric coupling; insulation protection; multi-physical field.