GIS中自由运动片状颗粒的局部放电特征

Partial Discharge Characteristics of Sheet Free-Movement Particle in GIS

为研究GIS中片状金属颗粒的运动及局部放电特征,该文在实验室中制备了以实际126kV气体绝缘组合电器(gas insulated switchgear,GIS)设备为原型等比例缩小的实验腔体,仿真计算了不同尺寸片状颗粒的带电量以及颗粒所受的库仑力,试验研究了片状颗粒和线形颗粒的运动轨迹及放电特征。研究表明:1)站立状态下在保持片状颗粒体积不变时,片状颗粒的带电量及所受的库仑力与片状颗粒的长度、宽度及厚度有关。2)片状颗粒和线形颗粒的V和L相同时,无论片状颗粒的W/T如何变化,片状颗粒的带电量均大于线形颗粒带电量,且随着片状颗粒W/T的增大,片状颗粒带电量与线形颗粒带电量之差增大。3)片状颗粒的起举电压、贯穿跳动电压以及最小维持站立电压均小于相同长度、相同体积的线形颗粒,且在相同电压下,片状颗粒和线性颗粒的放电特征存在较明显的差别。通过对GIS中片状颗粒带电量及所受的库仑力的探索,进一步加深了片状颗粒运动行为的把握,为后续金属颗粒危害性的研究提供重要的参考。

In order to investigate the movement and discharge characteristics of sheet particle in GIS, an experimental cavity proportional shrunken according to 126 kV GIS prototype was set up in the laboratory. The amount of charge and the electric field force of the particle in GIS were simulated. The particle movement locus and discharge signals were recorded and observed. The results show that： 1） The amount of charge and electric field force is related to the size of particle when the volume of the sheet particle remain unchanged. 2） The charge amount of sheet particle is always larger than that of linear particle, no matter how the width/thickness of sheet particle changes when the width equal the thickness of sheet particle, and the difference between the charge amount of sheet particle and that of linear particle with the increase of width/thickness of sheet particle. 3） The initial standing voltage, the running through gas voltage and the minimum sustaining standing voltage of the sheet particle are all less than that of linear particle with the same volume and length as sheet particle. At the same voltage, the discharge characteristics have obvious difference between sheet particle and linear particle. According to the exploration of The amount of charge and the electric field force of sheet particle in GIS, the understanding of sheet particle motion behavior is further deepened, which can provide an important reference for the study of the harmfulness of linear particle.