特高压交流输变电工程设备的电晕试验

Corona Experiment of Apparatus in the UHV AC Power System

为了解特高压级交流输电系统工程设备的电晕特性,针对晋东南—荆门1000 kV级交流输变电示范工程,研究了1000kV交流输变电工程设备电极电晕试验的方案,并利用武汉特高压试验线段开展了特高压设备及设备用典型均压环可见电晕模拟试验研究,1000kV级分裂耐热扩径软导线及分裂导线、管型母线、线路典型均压环和绝缘子串起晕电压的试验。试验获得了特高压输变电工程设备的电晕参数及导线起晕电压与布置高度的关系即起晕电压与布置高度成正比,可为特高压工程建设提供设计参考依据。

The corona characteristics of apparatus used in an ultra high voltage AC power system project has an effect on the environment, the power loss and building cost of this project, and it also has an effect on the operational controlling mode. Through the visible corona experiment, a lot of parameters which directly influence the corona characteristics can be obtained. Based on the UHVAV model power project from southeast in Shanxi province to Jingmen of Hubei province, which is the first UHV AC project in China. The area where the overhead line cross has different condition, and it have a lot of effect to the corona characteristics. This paper researches the method of corona test of the apparatus for the UHVAC power system, and carries out the experimental research on visible corona of apparatus for the 1000 kV power system and typical grading ring of those apparatus, the experimental research on critical corona inception voltage of the heat-resistant diameter expanded flexible conductor, the bundle conductor and the tubular bus bar, and the experimental research on visible corona extinction voltage of typical grading ring for transmission line and insulator strings. The experimental acquire the corona parameter of apparatus for UHVAC power system, and the relationship between corona voltage and the height of conductors. And the minimum of the grading ring＇s diameter is also achieved. The result of that research provides valuable reference materials to the construct of UHV power system.