Influence Of Corona Discharge On Electric Field Around Split Lines Under UHV/EHV Transmission Lines

In recent years, the rapid growth of economic development and the need of electricity, makes the development super-high voltage transmission has become an inevitable trend. With the continuous development of the global economy and public environmental awareness's enhancement, the electromagnetic environment is caused by more and more people. Voltage level higher and wider use of compact lines, corona surrounding the phenomenon of transmission line frequency electromagnetic pollution of the environment may be more serious, and transmission line electromagnetic environment measurement under the electric field is an important parameter. Therefore, under the transmission line on the corona discharge around the calculation of the electric field has a certain theoretical significance and value engineering.Firstly a detailed understanding of the basic concepts of corona discharge, the physical process of corona wire surface field effect and the factors affecting the case, in-depth study and calculation of electric field around transmission lines. In the detailed analysis of the transmission line corona discharge based on physical processes, from the gas discharge theory is derived are polar corona phenomena of space charge formula and proposed a method based on the equivalent exchange of charge under the power line halo field is calculated. Selected papers at home and abroad can be found in the literature provide an example for the calculation model, the electric field simulation results are compared, the results proved that paper the transmission line corona discharge established model is accurate, the use of the equivalent charge method is feasible and effective.Then, for the compact circuit EHV line electromagnetic environment may worsen the problem, compared 750kV compact UHV transmission lines are three types of corona discharge wires on the ground frequency electric field strength. Geometry of the wire location and size of the corona discharge effect, concluded that the best improvements.And then, link from the transmission line design considerations, using RBF method to split wire three-phase electric field strength near the surface and the distribution of sub-conductors discussed the location and relative impact of the corona discharge wire. Paper first gives the RBF interpolation with points assigned based on point of principle and the approximate solution of differential equations, and then apply the RBF method is different from the wire surface and within the vicinity of the distribution of potential and draw out the wire surface field strength of the electric field intensity distribution of the maximum time and potential distribution near the wire.Finally, the investigation on influence of corona discharge on electric field around transmission lines was briefly summarized. Through a comprehensive study of transmission line electric field around that: use of the improved equivalent charge method in the high voltage transmission line corona discharge on the ground frequency electric field has an equivalent charge of several small, the advantages of simple calculation, for multi-split lines in the case; RBF collocation method as a class-based meshless method, no mesh generation, solving problems in high precision; In addition, the RBF method by splitting the wire surface field can reflect more accurately the result of the location of the split conductor different location due to the difference between corona discharge. Taking into account the RBF method in electromagnetic calculations with the feasibility, effectiveness and outstanding performance advantages, as will further research the issue in the calculation of corona loss will play a more prominent role.