浅谈±500kV直流输电线路导线的电气性能

Discussion On Conductor Electrical Performance of ±500 kV DC Transmission Line

分析±500 k V直流输电线路导线的电气性能,为直流输电工程的导线选型提供依据。选择了国内外高压直流线路中常用的6种普通钢芯铝绞线,通过对导线的电流密度、导线表面电场强度、合成场强、离子流密度、无线电干扰、可听噪声、电能损耗等进行比较分析,得到各型号导线的电气性能参数。根据分析结果可知,导线分裂数越多、导线截面积越大,其电气性能就越好,但会导致投资成本的增加。总体来说,所讨论的6种普通钢芯铝绞线中,4×JL/G2A-900/75钢芯铝绞线最适合±500 k V直流输电线路工程使用。

The electrical performance of ± 500 kV DC transmission line conductor is analyzed to provide basis for the conductor selection of DC transmission project. Six normal aluminum conductor steel reinforced conductors usually used in HVDC transmission lines at home and aboard are selected. By analyzing and compare conductors＇ current density, conductor surface electric field intensity, synthetic field intensity, ion current density, radio interference, audible noise and electric energy loss and so on, electrical performance parameters of each conductor are obtained. According to the analysis results, it is found that the more the conductor bundle number and the larger the conductor area, the better the electrical performance, but the investment cost will be increased. Generally speaking, the 4×JL/G2A-900/75 type aluminum conductor steel reinforced conductor in the discussed six normal aluminum conductor steel reinforced conductors is most suitable one to be used in ±500 kV DC transmission line project.