基于隧穿磁阻效应的多点电晕放电磁场传感及定位

Measurement and Location of Multiple Corona Discharges Based on Tunneling Magnetoresistive Sensors

电晕放电的检测及定位对于电网设备的稳定运行至关重要。为此针对多个点对板形式的电晕放电进行了磁场传感测量及定位研究,基于隧穿磁阻传感器设计并制作了双轴磁场传感测量装置,通过传感测量装置对电晕放电脉冲电流产生磁场的响应,实现对电晕电流及其磁场的测量。应用电晕电流的定位算法,得到多个点对板的电晕放电点位置,定位计算误差稳定在10%左右,表明了测量方法及定位算法的可行性。该测量方法及算法考虑了电晕电流的特点,合理利用了隧穿磁阻传感器的测量优势,为电气设备的电晕放电检测提供了新的思路及可靠手段。

The detection and location of corona discharge are essential for the stability and reliability of electrical equipment in power grid. We proposed a novel method for measurement and location of multiple discharge points based on tunneling magnetoresistive sensors. A dual-axial tunneling magnetoresistive sensor device was designed and prepared to measure the magnetic field vector. The corona discharge current and magnetic field in free space were achieved by sensors＇ responses to the external discharge magnetic field. The locations of multiple corona discharge points were calculated based on the location algorithm. The results indicated a relative error was approximately 10%, which was reasonable for the practical application. The measurement device and location algorithm fully utilizes the sensors＇ merits and provides a promising solution for multiple corona discharge location.