Numerical Calculation Method of EHV/UHV AC Corona Loss Based on Streamer Theory

Abstract

For the selection and design of Ultra/Ultra High Voltage (EHV/UHV) transmission lines, the calculation of corona losses is very important content of the research. A numerical calculation method of corona losses of EHV/UHV alternating current (AC) transmission lines based on streamer theory is proposed in this paper. In this method, Peek’s formula is not used to calculate the corona onset electric field. Instead, the corona onset electric field is calculated from the physical process of corona production on the surface of the line, and the influence of raindrops on the corona onset electric field is considered according to the law of deformation of raindrops in the electric field. After the corona onset electric field was obtained, corona losses of the wire can be obtained by calculating the ion flow field of the bundled conductors. The result of the example shows that the calculation result of this method is accurate relatively compared with the measured values. The calculation method of this paper has certain practical application value for the calculation and study of EHV/UHV AC corona loss in rainy days.