Analysis of Influence Factors and Influence Law of Scattering Electric Field of High Voltage Transmission Line in Short Wave Frequency Band

The study of the influence factor of transmission line scattering and its influence law is the key to developing the transmission line passive interference suppression strategy. Therefore, the line-surface geometric model of electromagnetic scattering of transmission lines is constructed in this paper. The method of moments (MOM) built in Feko simulation software is used to solve the induced current on the surface of transmission lines and the scattered electric field generated by it. Taking the ±800 kV Xiangjiaba-Shanghai ultra-high-voltage direct current (UHVDC) transmission line as an example, the effects of the ontological structural features such as transmission line ground wire, line span, and tower height on the scattered electric field of the transmission line were investigated. The results show that the ground wire and tower insulation have little effect on the induced currents on the surface of the transmission tower, the scattered electric field at the observation point is less with the increase of the transmission line distance, and the scattered electric field at the observation point decreases with the increase of the height of the transmission tower. The findings of this paper can provide a reference for the protection of passive interference of transmission lines.