基于无线传输的球形空间瞬态电场测量仪研制

Development of a spherical space transient electric field measuring instrument based on wireless transmission

针对以往研制的空间电场测量仪所测量的冲击电场波形与实际冲击电压波形时间参数差异大,会对电场幅值测量带来误差等问题,该文对原有的电场测量仪结构进行改进,调整电场探头内部的取样电容量与采集卡入口阻抗进行匹配后,保证所获取波形与实际电压波形的一致性。同时将原有电场探头数据传输模式由光纤传输模式改进成无线传输的模式,可以最大程度地避免电磁干扰,更适合于复杂现场环境下的电场测量。将改进后的电场测量仪在冲击近似均匀电场、非均匀电场及工频均匀电场下进行标定,标定结果表明其具有良好的线性度。所研制的球形电场测量仪可用于变电站内的线路过电压监测,冲击分压器线性度辅助测量等多种场合,具有广泛的实际应用价值。

In order to solve the problem that the time parameters of the impulse electric field waveform measured by the space electric field measuring instrument developed in the past are different from the actual impulse voltage waveform, which will bring errors to the measurement of the electric field amplitude, this paper improves the structure of the original electric field measuring instrument, adjusts the sampling capacitance inside the electric field probe to match the input impedance of the acquisition card, which ensures the consistency between the obtained waveform and the actual voltage waveform. At the same time, the original electric field probe data transmission mode is improved from the optical fiber transmission mode to the wireless transmission mode, which can avoid electromagnetic interference to the greatest extent, and is more suitable for the electric field measurement under complex field conditions. The improved electric field measuring instrument is calibrated under the uniform electric field and the non-uniform electric field. The calibration results show that the instrument has good linearity. The developed spherical electric field measuring instrument can be applied to many kinds of occasions such as overvoltage monitoring, impact divider linearity measurement and auxiliary equipment, etc., and has wide practical application value.