含悬浮金属板的棒-板-棒组合间隙操作冲击放电特性研究

Study on Switching Impulse Discharging Characteristics of Rod-Plate-Rod Combination Gap with Potential Suspension Metal Plate

电力系统中,存在一些悬浮导体构成的间隙,其放电特性较典型间隙更为复杂多样,放电特性规律尚未得到明确。设计了含悬浮金属板的棒-板-棒组合间隙试验装置,研究棒-板-棒组合间隙在操作冲击电压作用下的放电特性,分析不同电压极性、不同金属板位置下组合间隙的击穿电压并基于高速光学影像分析其放电过程现象。研究表明,金属板位于组合间隙不同位置时,其击穿电压变化较大,且在正负不同极性操作冲击作用下,其变化规律呈现出明显差异性;同时还观测到,当悬浮板靠近高压电极时,会出现单侧高压极棒-板间隙多次击穿这一特殊现象,电场仿真结果表明,单侧高压极棒-板间隙击穿后,有助于低压极起晕并产生流注通道向前发展。

In the power system,there are some combination gaps consisting of potential suspension conductors and typical gaps,whose discharge characteristics are more complex and diverse,and the rules of discharge characteristics are not clear yet. In this paper,a rod-plate-rod combination gap with suspension metal plates is designed to study the discharge characteristics of rod-plate-rod combination gap under switching impulse voltage. The breakdown voltage of the combination gap under different voltage polarity and different plate positions as well as the discharge process based on high-speed optical images are analyzed. The results show that the breakdown voltage varies greatly when the metal plate is located in different positions of the combined gap,and there are obvious differences between the positive and negative voltage. At the same time,it is observed that when the suspension plate is close to the high voltage electrode,there will be multiple breakdowns of the single high voltage rod-plate side. The results of electric field simulation show that the breakdown of single high voltage rod-plate side is helpful to the corona initiation of low voltage pole and the development of streamer.