特高压直流与500kV交流线路同塔并架防雷特性研究

介绍了±800 kV特高压直流线路与双回500 kV交流线路同塔并架的主要防雷性能及特点,并分别与单回±800 kV特高压直流线路,以及双回500 kV双回交流线路同塔并架的防雷性能进行对比分析,指出,同等条件下,交直流同塔并架线路特高压直流线路的反击耐雷水平比单回±800 kV线路更高,与500 kV交流同塔双回线路相比,水平相当。与单回±800 kV直流线路相比由于地线保护角更小,绕击耐雷水平更高,基本不会发生绕击闪路。与500 kV交流同塔双回线路相比,绕击耐雷水平略低。为国内外尚未出现的±800 kV特高压直流线路与双回500 kV交流线路同塔并架的实践提供技术参考。

Lightning Protection Characteristic Analysis of UHVDC and 500 kV AC Transmission Lines in the Same Tower

Lightning protection performances and characteristics of ± 800 kV UHV DC transmission line and double circuit 500kV AC transmission lines in the same tower have been introduced and compared with single circuit ± 800 kV UHV DC transmission line,and the double circuit 500 kV AC transmission lines.It has been pointed out that the lightning protection level of UHV DC transmission line with AC transmission line in the same tower is higher than single circuit of ±800 kV DC lines and as the same level of double circuit 500 kV AC transmission lines in the same tower.As compared with single circuit ±800 kV DC transmission line,the shielding level is higher due to smaller grounding line protection angle,where the shielding lightening will not occur.As compared with the 500 kV AC double circuit transmission line with the same tower,the shielding level is a bit lower.This paper provides technique references for the practice of ±800 kV UHV DC transmission line and double circuit 500 kV AC transmission line in the same tower,which is still not appeared at home and aboard.