高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2009年
4期
802-808
,共7页
伏进%司马文霞%杨庆%YANG Li-bin%LI Zhi-tai
伏進%司馬文霞%楊慶%YANG Li-bin%LI Zhi-tai
복진%사마문하%양경%YANG Li-bin%LI Zhi-tai
DC transmission line%ATP-EMTP%insulator strings%grounding electrode lines%unbalanced current%locking condition%over-voltage
This paper calculates and researches on lightning accident of ±500 kV Xing-An DC transmission line in Guangdong based on ATP-EMTP and the simulation calculation model of the HVDC has been constructed. The re- sults show that: when a lightning current strikes to the positive polar conductor of double circuit transmission line and the flashover of insulator strings occurs, as the over-voltage wave propagating along the lines due to the cou- pling effect between the conductors, the grounding electrode lines would produce the coupling voltage wave, which makes the flashover of the insulator strings occur at the different place along the grounding electrode lines, the un- balanced current of the grounding polar line is produced due to the insulator strings flashover and the unbalanced current exists for a long time, when the unbalanced current is up to the locking condition, the negative polar conduc- tor is locked and the double-pole block fault occurs. In the paper, some effective measures are given to prevent this accident.