摘要
目前我国向家坝—上海±800kV特高压直流输电工程正在紧张的设计和建设中,作者拟通过试验和仿真计算对±800kV直流工程用管母线的直流起晕特性进行系统研究。首先在北京、西宁和拉萨3地进行了多种直径模拟管母线的可见电晕对比试验,然后利用模拟电荷法对不同直径管母线表面电场分布进行仿真计算,并结合气体放电理论得到管母线负极性电晕的起晕电压。将试验数据和仿真结果进行对比,两者较为吻合。且由试验和仿真数据均可看出,母线起晕电压随着对地高度和母线直径呈线性变化关系;仿真计算还表明,随着对地高度和母线直径的进一步增加,母线起晕电压呈现出饱和的趋势。文中还针对海拔对管母线起晕电压的影响进行了讨论,给出了工程适用的海拔校正方法。
±800kV UHV DC transmission projects have been under design and construction in China, corona onset voltage of ±800kV bus bar was studied through numerical calculation and experiment. Visible corona tests of several busbars of different diameter were carried out in Beijing, Xining and Lhasa where with different altitude respectively, and charge simulation method was employed to calculate the distribution of electrical fields in the vicinity of busbar surface, and then the calculated electric field values and the criteria from gas discharge theory were utilized in evaluating the onset voltage of negative coronas on busbar. By comparison, the calculated onset voltages agree satisfactorily with measured values in full-scale tests. Both data indicates that corona onset voltage of busbar is linear relationship with the height above ground and the diameter of busbar. Besides, simulation results indicate that corona onset voltage tends to be saturated when height above ground and diameter increase further. In addition, the influence of altitude on corona onset voltage of busbar is also discussed, and altitude correction method used in the project is suggested in this paper.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第22期47-52,共6页
Proceedings of the CSEE
基金
国家电网公司科技项目(SGSC[2005]81)
