局部表面电导率测量仪器及测试方法  

Instruments and Method for Measuring Partial Surface Conductivity

作　　者：孙保强[1] 关志成[1] 王黎明[1] 赵宇明[2] 张福增[2] 

机构地区：[1]清华大学深圳研究生院,深圳518055 [2]中国南方电网有限责任公司科学研究院,广州510000

出　　处：《高电压技术》2014年第3期878-884,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724503);南方电网公司重点科技项目(编号略)~~

摘　　要：为推广局部表面电导率法在绝缘子污秽程度评估中的应用，结合试验，介绍并比较了2种测量仪器的工作方法和应用性能。2种仪器均为通用仪器，1种是由调压器、精细电阻构成的简易测量系统，另1种是专用电阻测量仪器。采用这2种仪器对玻璃板上不同污秽的局部表面电导率值进行了测试，结果显示：不同的测量装置及电极型式对相同污秽度表面的局部表面电导率测量值的影响很小；在0．05～0．40mg／cm2的盐密范围内，2种仪器测量的表面电导率的最大差异〈1％，而采用矩形电极和圆形电极的测量结果差异〈3％；电源频率对局部表面电导率有较大影响，频率增大10倍时，局部表面电导率会增加约10％；电源电压对局部表面电导率几乎没有影响，1V与20V电源电压的局部表面电导率测量值差异约为1％。试验表明，局部表面电导率法在实际应用中简易可行且准确度高，有较好的应用前景。In order to extend the application of partial surface conductivity （PSC） measurement in contamination evalua- tion of insulators, we demonstrated and compared the mechanism and performance of two devices. Both of them are general instruments, one of which is made up of voltage regulator and precision resistance, and the other is a special measuring device of resistance. Using these two devices, we measured the PSC of glass plates with different pollution le- vels. It is shown that there is only small difference of the results between different measurement devices and different probe shapes： with salt density within 0.05-0.40 mg/cm2, the difference between the PSC obtained by the two devices is less than 1%, and that between the PSC obtained by rectangular electrodes and round electrodes is less than 3%. Power supply＇s frequency may have significant impact on PSC measurement： with a ten times increase in frequency increases, the PSC rises by about 10%. Yet power supply＇s voltage has hardly any influence on PSC measurement： there is differ- ence about 1% between the PSC obtained using the voltage of 1 V and 20 V. It is concluded that the PSC method is simple, feasible, highly accurate, and hence promising in application.

关 键 词：盐密 污秽度测量 表面电导率 电源电压 测量误差 电源频率 

分 类 号：TM934.16[电气工程—电力电子与电力传动]