基于表面电位测量的表面电荷反演计算  

Inverse Calculation of Surface Charge Based on Surface Potential Measurement

作　　者：付洋洋[1] 王强[1] 张贵新[1] 王新新[1] 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室,北京100084

出　　处：《高电压技术》2013年第1期88-95,共8页High Voltage Engineering

基　　金：国家重点实验室科研项目(SKLD09KZ02);国家电网公司科技项目(G71-07-004)~~

摘　　要：目前无法直接测量得到表面电荷分布,而必须根据测量结果进行复杂的表面电荷反演计算。为此,对表面电荷反演计算方法进行了研究。基于绝缘子表面电位测量,对日本学者Ootera等人提出的表面电荷反演计算方法进行了改进,将原先的对关联矩阵2次求逆简化为1次求逆。使用改进后算法,以直流电压下空气和SF6气体中盆式绝缘子表面电位的测量结果为算例,计算得到的自由电荷面密度空间分布与改进前算法的结果一致。与改进前算法相比,改进后算法进一步得到了绝缘子表面视在电荷与极化电荷的面密度分布,并发现同一气体环境下自由电荷与视在电荷面密度峰值有明显差异,空气中相差370pC/cm2,SF6气体中相差530pC/cm2。Distribution of surface charge can not be directly measured with current techniques but only be determined by complicate inverse calculations based on the results from indirect measurements.Therefore,we studied methods for the inverse calculation,and presented an improved method on the basis of the method proposed by Ootera and his colleagues.In the improved method,the original twice inverses of the incidence matrix were simplified to a once inverse.The surface charge accumulated on cone-type insulator in the air or the SF6 gas under DC voltage was calculated using the improved method.The results show that the distribution of the surface free charge obtained with the improved method is the same as that with the unimproved method.Compared with the original algorithm,the improved method can further obtain the density distributions of surface apparent charge and polarization charge.Moreover,it is found that,in the same gas environment,there is a significant difference in the amplitude of surface density between free charge and apparent charge,which is 370 and 530 pC/cm2 in the air and SF6 gas,respectively.

关 键 词：绝缘子表面电荷 绝缘子表面电位 沿面闪络 盆式绝缘子 振荡Kelvin探针 静电探针 

分 类 号：TM216[一般工业技术—材料科学与工程]