GPO-3隔板对棒-板间隙工频击穿电压的影响及表面残余电荷特性

Influence of GPO-3 Barrier on AC Breakdown Voltage of Rod-Plane Gaps and Surface Residual Charge Characteristics

在空间有限的高压箱内部,通过合理引入绝缘隔板,可显著提高整个系统的绝缘性能。该文研究聚酯玻璃毡板(GPO-3)尺寸、位置和厚度对"棒-隔板-地电极"工频击穿特性的影响;采用非接触式表面电位计,研究放电后隔板表面残余电荷衰减特性。实验结果表明,GPO-3隔板的增加会阻止电晕层的发展,"棒-隔板-地电极"系统的击穿电压最大可提高至原来的1.91倍。当隔板厚度超过约6mm时,击穿电压增幅较小;工频电压下间隙放电后,GPO-3表面存在明显的残余电荷,且滞留时间较长,放电后GPO-3的表面电位为3856V,衰减1h后仍为239V。基于Simmons理论,计算材料表面陷阱分布,发现GPO-3表面残余电荷密度峰值为1.59×10^19/m^3和8.87×10^18/m^3,对应陷阱能级约为1.0eV,深陷阱是导致隔板表面电荷积聚的主要原因。该文可为工程设计中绝缘隔板的设计提供理论和实验依据。

The insulation performance of the whole system can be greatly improved by introducing the insulation barrier.The effects of size,position and thickness of insulation barrier on ac breakdown voltage were studied.Furthermore,the surface residual charge properties on the barrier after discharge were measured by non-contact surface potentiometer.The experimental results indicate that the breakdown voltage of the system increases up to 1.91 times.When the thickness exceeds about 6 mm,the increase of breakdown voltage is not obvious.Obvious residual charges can be observed on the barrier after breakdown,while the surface potential of GPO-3 reaches 3856 V after breakdown and reduces to 239 V after 1 h.The peak density of surface charges on GPO-3 are 1.59×10^19/m^3 and 8.87×10^18/m^3 respectively,and the trap level is about 1.0 eV.This paper can provide a reference for the design of the insulation barrier.