绝缘材料高压气体沿面闪络特性研究

Surface Flashover Properties of Insulators in High Pressure Gas

为研究几十微秒脉冲作用下高压气体中绝缘材料的沿面闪络特性,研制了一个高电压绝缘测试平台。该平台通过高压电容对同轴线进行谐振充电,谐振倍压可达1.6,输出电压可达350kV,充电时间约30μs。在0.4 MPa高压氮气环境下对平板结构的尼龙和有机玻璃沿面闪络特性展开实验研究,利用韦伯统计分析工具,发现闪络发生概率为0.1%时,有机玻璃的沿面最大电场强度是尼龙的1.64倍。分析了两种不同刻槽结构对有机玻璃沿面闪络电压的影响,发现半圆形刻槽能更好提升沿面闪络电压,因为这种结构更能抑制电子沿材料表面的运动。

A high voltage platform is created to study the surface flashover properties of insulators under microsecond impulse voltage in high pressure gas,on which a high voltage capacitor is used to resonantly charging the coaxial line for 30μs,achieving 1.6 for the ratio of coaxial line voltage to the capacitor voltage,an output voltage of 350 kV.The surface flashover properties of plate Nylon and PMMA were conducted in 0.4 MPa high-pressure N 2.It’s found that by using Weibull statistical tool,the occurrence rate of flashover is 0.1%and the maximum electric field strength of PMMA is 1.64 times as much as that of nylon.The effect of two different grooves on surface flashover voltage of PMMA reveals that the flashover voltage of semicircular grooved PMMA is better enhanced,because this structure restrains the movement of electrons along the material’s surface.