不同绝缘支柱材料及改善措施对高压直流分压器测量准确度的影响研究

Study on the Influence of Different Insulation Materials and Improvement Measures on the Measurement Accuracy of HVDC Voltage Divider

在1×10^(-5)数量级上提高高压直流电阻分压器的测量准确度,对直流高电压的精密测量具有重要意义。为减小高压直流分压器中沿绝缘支柱表面的泄漏电流,研究了不同绝缘支柱材料及改善措施对分压器测量准确度的影响。搭建包含50 kV被测分压器、100 kV标准分压器和同步采集系统的试验平台。在完成高精度数字万用表标定试验后,开展了有机玻璃和聚四氟乙烯材料对分压器测量准确度影响的测量试验。研究了增加内屏蔽电阻和在分压器内部充氮气对分压器测量准确度的改善效果。得出的结论对设计0.005级及以上准确度等级的高压直流电阻分压器具有一定的借鉴作用。

It is important to improve the measurement accuracy of the high voltage DC resistance divider at 1 ×10^（-5） order of magnitude.In order to reduce the leakage current along the insulating pillar surface in the high voltage DC divider,this paper studies the influence of different insulation materials and the improvement measures on the accuracy of the voltage divider.The test platform is built,which includes the 50 kV divider,100 kV standard voltage divider and synchronous acquisition system.After completing the calibration test of the high precision digital multimeter,the measurement experiment of the influence of the organic glass and the polytetrafluoroethylene material on the measuring accuracy is carried out.And the effect of increasing the internal shielding resistance and filling the nitrogen in the divider on the accuracy of measuring is studied.The conclusions obtained in this paper can be used as a reference for the design of high voltage DC resistance divider with 0.005 accuracy levels.