摘要
为了改善基于场磨的合成场测量系统在直流输电工程电磁环境监测应用中的便携性,对不加金属盖板的场磨测量技术进行研究。建立场磨及平行极板标定系统的三维仿真模型,仿真分析金属盖板面积、平行极板尺寸与间隙距离以及场磨结构参数对被测电场的影响。仿真结果表明:平行极板的间隙距离和极板大小对被测电场影响较小,而盖板的面积大小和场磨结构对被测电场影响较大。当盖板面积和场磨结构参数确定后,对被测电场的影响存在一个相对固定的电场畸变系数,该系数可以用于场磨的标定。采用平行极板对加盖板和不加盖板情况下的电场畸变情况进行试验研究,试验结果与仿真结果比较吻合,均表明不加金属盖板进行高压直流合成场测量是可行的。基于仿真和试验结果,提出两种不同的标定方法,并对不加金属盖板的场磨样机进行标定,现场试验结果表明标定之后的不加金属盖板的场磨可以满足工程上直流合成场强的测量需要。
The field mill is always used to measure total electric field at present. In order to improve the portability in the measurement of total electric field,field mill must be used in a metal plate system,Consequently, the influence of the area of metal plate on measurement result was researched by simulation and experiments. The simulation model of field mill and parallel plate calibration system was set up. And the influences of the area of metal plate, the gap distance and diameter of parallel plate on the measured electric field were simulated and analyzed. The simulation results show that the gap distance and diameter of parallel plate have negligible effects on the measured electric field, but the area of metal plate and the structure parameters of field mill have remarkable influences on the measured electric field. Nevertheless, there is a fixed electric field distortion coefficient for the influence of the measured electric field when the area of metal plate and structure parameters of field mill are fixed. And the distortion coefficient can be used to calibrate the field mill. The experimental results are in good agreement with the simulation results, which show that it is feasible to measure total electric field by use of the field mill in the absence of metal cover plate. Based on the results of simulation and experiments, two different calibration methods are proposed, and the field mill in the absence of metal cover is calibrated. The field test results show that the field mill in the absence of metal cover can meet the measurements requirements of high voltage DC total electric field strength.
引文
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