摘要
通过分析架空绝缘导线雷击断线机理,研制出一种防弧金具.经过几百次的雷电冲击放电试验和十几次工频短路电弧试验的验证表明:在辐射形线路上距绝缘子(P-20)中心线负荷侧100~150 mm范围内安装该防弧金具,雷电过电压均在防弧金具与绝缘子钢脚之间引起闪络,接续的工频短路电流电弧的弧根固定在防弧金具上燃烧,能可靠地保护导线免于烧伤.对于环网线路,将绝缘导线由绝缘子轴线起向两侧各剥离一段绝缘层(300mm),安装上该防弧金具,在任何潮流方式下均能有效地保护导线免于烧伤.
A new arc-protection hardware is studied and developed by analyzing the lightning-caused breakingmechanism of covered conductors. Over hundreds of lightning flashover tests and several times of power frequency arc tests show that when the arc-protection hardware is installed on covered transmission conductors about 100mm to 150mm from the center of the pin insulator just on the load side in radioactive network, lightning caused flashover occurs only between the hardware and the pin insulator, and the arc抯 roots of the following power frequency short circuit current will keep burning on the hardware. It is effective and feasible to prevent covered conductors from lightning-caused breaking innon-radioactive network when the arc-protection hardware are installed at covered conductors about 300mm from the center of pin insulators just on both sides of insulators and the insulation covers of conductors between two hardware should be cut off.
出处
《电网技术》
EI
CSCD
北大核心
2002年第9期25-28,共4页
Power System Technology
