交直流复合电压下气固复合绝缘的击穿特性

Breakdown Characteristics of Gas-solid Composite Insulated Gap Under Combined AC and DC Voltages

在新型电力系统发展阶段下,交直流混联电网系统的格局正在形成,交直流叠加作用下电气设备的绝缘性能迎来新的挑战。在气体绝缘间隙中引入聚合物隔板,能够提高气体的绝缘性能,有利于电气设备的小型化。本文基于并联回路,搭建了气固复合绝缘间隙下交直流复合电压击穿试验平台,通过改变直流电压分量、电极半径和隔板位置,研究了复合击穿电压幅值和电压分量特性。在本文试验条件范围内,当直流电压分量在20kV至62kV时,直流电压分量对复合击穿电压的影响不显著。随着隔板与高压电极距离的减小和电极半径的增大,复合击穿电压都增大。交流电压分量与直流电压分量为负线性相关。棒-板结构下隔板的作用效果最好,复合击穿电压最大提升1.81倍。

In the development stage of the new power system,the pattern of AC-DC hybrid grid system is taking shape,and the insulation performance of electrical equipment under the superposition of AC and DC is facing new challenges.Introducing a polymer barrier into the gas insulation gap,it can improve the insulation performance of the gas and facilitate the miniaturization of electrical equipment.In this paper,based on the parallel circuit,an AC-DC composite voltage breakdown test platform was built in gas-solid hybrid insulation gap.The composite breakdown voltage amplitude and voltage component were studied by changing the DC voltage component,the electrode radius and the position of the barrier.When the DC voltage component was between 20kV and 62kV,the DC voltage component had little influence on the altitude of the composite breakdown voltage under the experimental conditions.As the distance between the barrier and the high voltage electrode decreased and the electrode radius increased,the composite breakdown voltage increased.The AC voltage component was negatively linearly related to the DC voltage component.The effect of the barrier was the best under the rod-plate structure,and the composite breakdown voltage was increased by a maximum of 1.81 times.