Study of magnetic fields from different types of lightning faults on a multi-tower system

Abstract

Models of one or several extremely simple transmission towers (pylons) are usually used foranalyzing the influence of lightning strikes on power network. Models of more complex transmission towers with transmission lines, ground wires and even lightning channel are required. In this paper, first of all, the reason why one only focuses on the magnetic field at the observation points is briefly explained. Secondly, a method used to get the time-domain results from the frequency-domain results by Antenna Design Framework Electromagnetic Satellite (ADF-EMS) software is established and its validity is proved. Thirdly, the effects of the lightning channels with different geometries are discussed. Finally, this paper comes up with a complex multi-tower system under the following fault types of lightning strikes, 1) direct lightning strikes to the edge phase wire without flashover, 2) direct lightning strikes to the edge phase wire with flashover, 3) lightning strikes to the top of the tower without flashover, and 4) lightning strikes to the top of the tower with back flashover. The magnetic field waveforms from these fault types are very important for the follow-up activity to achieve the fault type identification of lightning strikes in the observation system automatically.

Study on the Application of Optical Current Sensor for Lightning Current Measurement of Transmission Line

“…Some researchers have conducted extensive research in this field, and currently mainly use the following devices: magnetic steel bars [5], magnetic tape [6,7], and Rogowski coils [8,9]. Ping et al [5] started using magnetic steel bars to measure the Zhejiang Xin-Hang line for several decades, on which the relevant industry standards in China are based.…”

“…The structure of the Rogowski coil is simple, convenient to install, and can be used to measure large pulse current signals with a large amplitude and rapid change. It has been a primary research target of lightning current measuring devices for transmission systems in recent years [8,9]. However, the Rogowski coil has a bandwidth limitation in the measurement principle, which contains low frequency information with large amplitude in lightning current.…”