Study on Human Exposure to Power Frequency Electric Field under UHV Transmission Line

Abstract

The development, construction and research of Ultra High Voltage transmission system has become the top priority of China's power industry. When the voltage transmitted by the transmission line reaches the ultra-high voltage stage, the power frequency electric field intensity around the transmission line will also increase, which may cause electromagnetic compatibility or electrical safety problems, thus having a certain impact on the human body. In order to meet the requirements of China's electromagnetic environment around transmission lines, it is necessary to study the electromagnetic environment around UHV transmission lines. In this context, this paper studies the distribution of power frequency electric field and human body current under the electromagnetic environment of UHV AC transmission lines by finite element analysis. The human body model is established by using three-dimensional finite element analysis software ANSYS to study how to set reasonable human electrical parameters in the modeling process. The induced current of human body in power frequency electric field is qualitatively analyzed, and the influence of skin effect is analyzed. 1000 kV UHV AC transmission line is established by ANSYS software. The power frequency electric field distribution under the transmission line is simulated, and the electric field distribution law under the UHV AC transmission line is obtained. The human body model is placed under the transmission line to simulate the electric field intensity and current density distribution on the human body surface and around the transmission line. The influence of human body on the electric field distribution under transmission lines is compared and analyzed. According to the relevant power frequency electric field limit standard and the electric field distribution under the UHV transmission line obtained by simulation, the safety zone under the transmission line is proposed.