摘要
绝缘子串并联间隙能够为雷电泄放提供通道从而有效保护绝缘子。目前并联间隙的研究中关于高海拔条件下长绝缘子串并联间隙雷电冲击放电特性及其失效性的研究较少。为此,基于高海拔输电线路实际绝缘配置,在云南电网公司超高压交流户外试验场进行了220 kV长复合、玻璃绝缘子串并联间隙雷电冲击放电特性及其失效性的研究。结果表明:高海拔条件下并联间隙形状对长绝缘子串的雷电冲击放电特性影响不大;长绝缘子串并联间隙的雷电冲击50%放电电压随间隙距离的增大而升高,相应的伏秒特性曲线亦上移;不同材质长绝缘子串并联间隙的失效性规律不同,长复合绝缘子串的失效概率存在1个闭区间,而长玻璃绝缘子串的失效概率随雷电冲击电压的升高而近似以线性规律增大。
Parallel gap could protect insulator strings by means of providing release channel for lightning current. So far, studies on parallel gap seldom involve the gap＇s lightning impulse discharge characteristics and their possible protection failure in high altitude regions. Therefore, in the light of actual insulation configuration of transmission lines, we experimentally studied parallel gaps on both 220 kV lengthened composite and glass insulator strings in a UHV experiment filed of Yunnan Power Grid located at high altitude, and obtained the gaps＇ characteristics of lightning impulse discharge and their rule of protection failure. The results indicate that the figuration of parallel gap has little impact on its discharge characteristics. The 50% discharge voltage of parallel gap rises along with the elongation of gap, while the voltage-time characteristics curve of gap up shifts correspondingly. In addition, insulators of different materials show distinct failure regulations： with increasing applied impulse voltage, composite insulator strings have a closed interval in their failure probability; meanwhile, the failure probability of glass insulator strings increases approximately linearly.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第5期1365-1373,共9页
High Voltage Engineering
关键词
高海拔
长绝缘子串
并联间隙
雷电冲击
放电特性
失效性
high altitude
long insulator string
parallel gap
lightning impulse
discharge characteristics
invalidation
