10kV架空绝缘导线防雷击断线用非穿刺式带间隙金属氧化物避雷器

An MOA With Series Gap and Non-Piercing Electrode for Preventing Lightning Breakage of 10kV Overhead Insulated Lines

针对现有架空绝缘导线防雷击断线装置存在的普遍问题,研制了一种由绝缘子、避雷器与非穿刺式高压电极组成的新型绝缘装置。由于采用了非穿刺式高压电极,线芯和电极间有绝缘表皮的阻隔,绝缘表皮的击穿点位置不确定,导致高压电极的安装位置及其对应的间隙距离确定方法与同类装置有较大区别。采用精细化设计理念,提出了基于概率比较的绝缘配合原则,即利用Weibull概率分布模型的数据处理方法,比较放电概率以确定非穿刺式高压电极的安装位置及其对应的间隙距离。通过实例试验和计算,得到了P15绝缘子相匹配的非穿刺式高压电极安装最佳位置和对应的间隙最佳距离。通过试验验证了该距离下,放电通道均沿带间隙避雷器通过,有效防止绝缘导线的雷击断线。

In view of common problems existing in current devices for preventing breakage of overhead insulated conductors caused by lightning stroke, a new type of insulated device consisting of insulator, surge arrester and non-piercing HV electrode is developed. Due to usage of non-piercing HV electrodes, the wire core and the electrode are insulated with epidermis, so the position of breakage point of the insulating epidermis is uncertain, leading to installation position of the HV electrode and corresponding gap distance determination method different from the other devices of the same kind. Based on the concept of refined design, the paper puts forward an insulation coordination principle based on probability comparison, proposing to use Weibull probabilistic distribution model for data process, to determine installation position of the non-piercing HV electrode and corresponding gap distance. The optimum position and corresponding gap distance of the non-piercing HV electrode fitted with P15 insulator is obtained with example test and calculation. It is verified by experiment that the discharge channel passes along metal oxide surge arrester（MOA） with series gap under this distance and prevents lightning breakage of the insulated conductor effectively.