雷电流测量专用柔性无磁芯大型Rogowski线圈

Large Rogowski coil with flexible nonmagnetic core for lightning current measuement

为了解决小型Rogowski线圈无法测量柱状高塔的自然雷电流波形的问题,提出了采用大型Rogowski线圈测量高塔雷电流的方案,研究设计了柔性骨架无磁芯大型Rogowski线圈,去除磁芯和外加积分器,通过增加线圈匝数获得高电感,以实现测量结果的自积分,降低了微分型Rogowski线圈需要额外积分器的难度。Rogowski线圈的标定表明,线圈具有良好的积分特性,采用输出误差系统辨识模型对Rogowski线圈输出波形进行了校正补偿,提高了测量波形的准确度,增大了高塔自然雷电流精确测量的可能性。

When Rogowski coils are used to measure the time-domain waveforms of lightning currents flowing down tall column towers, the coils must have large inside radius and high current capability, then the low-frequency distortion caused in the measurement can be corrected. However, the most commonly used Rogowski coil cannot fulfill all of these. Therefore, this paper presents a large Rogowski coil with a flexible belt-like nonmagnetic core. Large inductance is obtained By increasing the turns of the coil, which makes the coil have self-integrating capability and reduces the difficulty of additional integration. At the mean time, the coil would not work in nonlinear and saturation ranges as the core is nonmagnetic. The calibration results show that this coil has a good self-integrating performance, and the low frequency distortion is perfectly corrected with system identification method.