局部放电校准器标准测量系统的研制及校验

Development and Calibration for the Reference Measurement System of Partial Discharge Calibrator

局部放电电荷量是国际计量局电磁计量领域校准测量能力的关键参数。在进行高压试品局部放电量的检测中,需首先用局部放电校准器对整个高压回路进行标定,局部放电校准器所复现的电荷量是局部放电测量准确与否的重要保证。通过理论推导和测量线路仿真,分析了局部放电校准器源内阻、连接电缆和积分电阻对积分波形和测量结果的影响。通过修正测量系统各档位积分系数,独立开发了自动化测量软件并将测量系统整体溯源到直流电流和时间参数。能力验证结果表明该测量系统满足参考电荷量测量仪准确度等级的要求。

The partial discharge apparent charge is a key parameter for the calibration and measurement capability of the International Bureau of Weights and Measures in the field of electromagnetic measurement database. In the detection of the partial discharge of the high-voltage equipment, the entire high-voltage circuit needs to be calibrated with a partial discharge calibrator first. The value of charge is an important guarantee for the accuracy of partial discharge measurement.Through theoretical derivation and measurement circuit simulation, the effects of source internal resistance, connecting cable and integral resistance of partial discharge calibrator on integral waveform and measurement results are analyzed.Through modifying the integral coefficient of each gear of the measurement system, an automated measurement software is developed independently and the overall measurement system is traced to DC current and time parameters. The capability verification results show that the measurement system meets the requirements of the reference charge meter.