重冰区±800kV特高压直流线路绝缘配合研究

Study on Insulation Coordination of ±800kV Extra High Voltage DC Transmission Line in Heavy Ice Areas

±800kV直流线路输送距离远,沿途气象条件复杂,存在高海拔、覆冰、污秽区,是线路外绝缘研究领域的难点.本文分析了高海拔地区覆冰、污秽条件直流外绝缘闪络特性,并依据中国电科院进行的全尺寸覆冰闪络特性研究成果,对重冰区±800kV直流输电线路绝缘子型式及绝缘子片数选择进行研究,推荐了重冰区特高压直流线路绝缘配置方案;探讨了多串并联条件对绝缘冰闪电压影响。

The length of ± 800kV DC transmission line is long, the meteorological conditions along the way are complex,there are high altitude, icing, contamination, therefore insulation coordination is a difficult problem..This article analyzes the effects of high altitude, contamination, icing on flashover performance of ±800kV DC Transmission Line, According to theresearch results of the full - scale flashover characteristics test by the China EPRI, the insulator type and insulator number selectionof the ± 800kV DC transmission line in the heavy ice area are studied. Recommended insulation configuation of UHV DC lines in heavy ice areas, discussed the effect of multiple series and parallel conditions on the icing flashover performance.