接地电阻和土壤电阻率及隐蔽泄流地网测量的输电杆塔防雷技术

Lightning Protection Technology for Transmission Towers Based on Grounding Resistance and Soil Resistivity and Concealed Drainage Ground Network Measurement

针对传统技术对输电杆塔的防雷诊断只是以测量接地电阻为基础,这种测量方法测量误差大。根据规程要求,提出了一种基于接地电阻和土壤电阻率及隐蔽泄流地网测量的输电杆塔防雷技术。文中接地电阻测量主要基于直线三极法测量,土壤电阻率测量则基于四极法测量,隐蔽泄流地网测量主要通过测量输电杆塔与地网隐蔽导通时两端电流的方式监测。关于接触电阻以及土壤电阻率,通过季节系数修正方式提高准确度。实践表明:基于接地电阻和土壤电阻率及其隐蔽泄流地网测量技术能够精确测量,利于输电杆塔选择合适的防雷技术。

The lightening protection diagnosis of the traditional technology is only based on the measurement of ground resistance, and the measurement error is normally large. According to the requirements of the regulation, this paper proposes a lightning protection technology for transmission towers based on grounding resistance and soil resistivity and hidden drainage ground network measurement. The measurement of grounding resistance is mainly based on the linear three pole method, and the soil resistivity measurement is based on the quadrupole method, while the concealed drainage ground network measurement is mainly monitored through measuring the current at both ends of the transmission tower and the ground network. Accuracy of the contact resistance and soil resistivity can be improved through seasonal coefficient correction. The practice shows that the proposed technology helps to realize accurate measurement, and it is beneficial to choose the appropriate lightning protection technology for transmission towers.