摘要
为研究在高海拔地区特高压输电线路复合绝缘子的闪络与击穿特性,建立适用于高海拔地区复合绝缘子的先导发展模型,在2 100 m的高海拔地区进行了800 kV的I型和V型复合绝缘子雷电冲击电压试验,用高速摄像机拍摄了放电过程图像,得到了2种布置方式下特高压复合绝缘子的雷电冲击闪络电压U50%和伏秒特性数据。并将伏秒特性曲线试验值与IEC推荐公式计算值和CIGRE推荐先导发展模型计算值进行了对比研究;通过数值仿真计算提出了适合高海拔地区复合绝缘子闪络的先导发展模型,并结合已有试验数据,对1.9、2.04和7.1 m串长复合绝缘子的先导发展模型进行了验证。结果表明:在相同绝缘长度为7.1 m时,V型复合绝缘子布置方式下空气间隙击穿,其击穿电压比I型复合绝缘子闪络电压高7%;高海拔地区特高压复合绝缘子闪络的先导发展模型与复合绝缘子空气间隙击穿的先导发展模型的k与E0值应采用0.7 10 6(m2/(v2 s))、440 kV/m和0.74 10 6(m2/(v2 s))、500 kV/m。
In order to research the flashover and breakdown character of composite insulator which are used in ultra high voltage （UHV） DC transmission project in high altitude area, established the leader propagation model for composite insulator in high altitude area, the lightning impulse flashover characteristics tested of I type and V type composite insulator, which are used in ＋800kV ultra high voltage DC（UHVDC）transmission project, have been carried out at the National Engineering Laboratory for UHV Engineering Technology （Kunming） where the altitude is 2 100 meters. The discharge process of these two kinds of insulators under lightning impulse voltage was recorded by high-speed cameras, and the Us0o/o and volt-time curve of these composite insulators were recorded and deduced. The experimental data were compared to the volt-time curve recommended by IEC and leader propagation model recommended by CIGRE, and a leader propagation model which can be used in high altitude area was established by using numerical simulation. And the contract studies with 1.gm, 2.04m composite insulators were also done in this paper. The results show that the breakdown voltage Usoo/o of V type composite insulator is 7 percent higher than that of I type composite insulator in the same insulation length of 7.1 m. The parameters k and E0 for composite insulator flashover model and air gap breadown model are 0.7 10 6（m2/（v2 s））、440 kV/m and 0.74 10 6（m2/（v2 s））、500 kV/m.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第34期158-164,23,共7页
Proceedings of the CSEE
基金
特高压工程技术(昆明
广州)国家工程实验室开放基金~~
关键词
高海拔
特高压
复合绝缘子
先导发展模型
闪络判据
high altitude
ultra high voltage （UHV）
composite insulators
leader propagation model
flashover criterion
