Abstract
More and more ultra-high voltage (UHV) transmission line will be built in China, and the design of external insulation is critical for the safe operation of UHV transmission line. Air relative humidity (RH) and temperature can affect its permittivity and electric field around the transmission line, hence in the paper the numerical relationship between the electric field, air permittivity and air temperature, RH is investigated by field measurement test and numerical analysis. Firstly the measurement tests are setup to measure electric field strength and atmospheric parameters, in which the electric field, air temperature and RH at same measuring point are measured repeatedly on different days. Then scatter plots are used to reflect the relationship between field strength and temperature along with relative humidity intuitively, and correlation analysis is conducted on the measurement data. Finally the numerical model for the electric field and air RH & temperature, numerical model for the air permittivity and air RH & temperature are obtained. The results provide reference for UHV external insulation design to improve their operation stability and performance.
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