我国±800kV特高压直流输电线路外绝缘问题  

External Insulation of ±800 kV UHV DC Power Transmission Lines in China

作　　者：蒋兴良[1] 苑吉河[1] 孙才新[1] 张志劲[1] 舒立春[1] 

机构地区：[1]高电压与电工新技术教育部重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《电网技术》2006年第9期1-9,共9页Power System Technology

摘　　要：我国已规划了多条±800kV特高压直流输电线路的建设,由于没有设计和运行经验,污秽、覆冰(雪)、酸雨(雾)和高海拔下的外绝缘选择将是其面临的关键技术之一。作者以国内外现有研究成果为基础,阐述了我国特高压直流输电线路外绝缘选择的特殊性,污秽、覆冰(雪)、酸雨(雾)和高海拔等对特高压直流绝缘子放电特性的影响,高海拔下长空气间隙的放电特性。指出污秽、覆冰(雪)、酸雨(雾)和高海拔是影响特高压直流输电线路绝缘子、空气间隙电气特性和外绝缘选择的重要因素,提出在应用现有方法进行特高压直流外绝缘选择时必须考虑污秽、覆冰(雪)、酸雨(雾)和高海拔的影响并加以修正。in China, the constructions of multi ±800 kV UHVDC transmission projects are planned. Because the experiences in design and operation of such UHVDC transmission line home and abroad are absent, the selection of external insulation of these projects under high altitude, contamination, ice coating, snow coating, acid rain and acid fog conditions is one of the key problem to be faced with. On the basis of existing research results home and ,abroad, the particularity in external insulation selection of domestic UHVDC transmission lines, the effects of high altitude, contamination, ice coating, snow coating, acid rain and acid fog on discharge characteristics of insulators for domestic UHVDC transmission lines as well as the discharge characteristics of long air gap under high altitude are expounded. It is pointed out that high altitude, contamination, ice coating, snow coating, acid rain and acid fog are important factors affecting the electrical performance of insulators, air gaps and the selection of external insulation of UHVDC transmission lines, and it is proposed that when existing methods are used to select the external insulation of UHVDC transmission lines, the effects of high altitude, contamination, ice coating, snow coating, acid rain and acid fog must be considered and these methods should be modified.

关 键 词：±800kV直流特高压 线路 换流站 外绝缘 高海拔 污秽 覆冰 覆雪 高电压绝缘技术 

分 类 号：TM721.1[电气工程—电力系统及自动化] U665.11[交通运输工程—船舶及航道工程]