杆塔接地装置冲击散流的测试技术研究

Study on measurement technology of impulse dispersing current in tower grounding device

雷电冲击下地中散流对设备、生物的影响已经得到了广泛关注。目前杆塔接地装置附近冲击散流缺乏直接、有效的测量,因此研究了冲击散流的测量技术。首先利用平板型电场测试结构设计并制作了地中散流测量装置并给出了地中散流空间的电流密度计算方法;然后搭建了测试平台以确定合适的装置尺寸,为了满足测量要求,电极板的间距需控制在0.01～0.02 m,电极板的长宽需控制在0.05～0.1 m;最后通过冲击模拟试验检验了装置的测量准确性,其测量的绝对误差在10 A/m^2以内。设计的测量装置已在广东省佛山市地区完成试点工程应用。

The effectiveness of dispersing current under lightning impulse on equipment and biology has been widely recognized. At present, there is no effective measurement of impulse dispersing current near tower grounding device. Therefore, the measurement technology is studied in this paper. Firstly, a device for measuring impulse dispersing current in the ground is made by using flat electrode structure and the calculation method of the current density in the ground is proposed. Then, a test platform is built to determine the appropriate device size. To meet the measurement requirements, the space of the electrode plate should be controlled at 0.01~0.02 m. The length and the width of the electrode plate should be controlled at 0.05~0.1 m. Finally, the measurement accuracy of the device is verified by simulation test. The absolute error of the device is less than 10 A/m^2. The device has been applied to the pilot project in Foshan City, Guangdong province.