超高压变电站导线电场计算及分裂方式研究

超高压变电站是整个输电工程的重要部分,现场观测结果表明,超高压变电站母线由于设计型式不合理及海拔高度影响,电晕现象尤为严重,从而导致较大的可听噪声和无线电干扰。为此通过经典公式分析了导线分裂方式、子导线线径、导线分裂间距等因素对其表面最大电场强度作用规律,并以某超高压变电站导线为例,根据实际电站结构,应用有限元仿真计算软件ANSYS建立了有限元三维仿真计算模型,计算了实际电站二分裂导线表面场强分布规律,而后将导线分裂方式设计为三分裂,与导线二分裂进行对比分析。最终在导线三分裂基础上,对子导线线径及分裂间距进行优化,最终优化结果取子导线线径64 mm、导线间距360mm,即可达到优化目标。

Research of Electric Field Strength on Surface of Conductor and Its Splitting Type Used in Ultrahigh High Voltage Substation

Ultrahigh high voltage substation is an important part of the whole transmission project located high altitude area. On-the-spot observation shows that due to unreasonable design of busbar for ultrahigh high voltage substation and the impact of height above sea level, the corona phenomenon is serious and causes the audible noise and radio interference. Therefore, the classic formula was used to illuminate the impact of conductor split form, conductor diameter, bundle spacing on the largest surface electric field intensity of the conductor. Taking a certain ultrahigh high voltage substation conductor as an example, three-dimensional simulation calculation model was established by using finite element simulation software ANSYS in accordance with the actual power station structure. The surface electric field intensity distribution of two-split conductor in actual power station was calculated. Then we design three-split conductor instead of two-split one, and make a comparative analysis between the two different forms. According to the three-split form mentioned above, the conductor diameter and bundle spacing were optimized. According to the results, the conductor diameter was 64 mm, and the bundle spacing was 360 mm, which attained the optimization goal.