中文摘要：

研究特高压交流线路的操作过电压波形发现,特高压输电线路操作过电压的波前时间比500kV输电线路长,可达数ms,98%的操作过电压波前时间＆gt;3000μs,但国内对长波前间隙放电的基础研究不多。为进一步研究长空气间隙长波前操作冲击放电特性,搜集整理了国内外的长波前试验研究数据,并对750kV紧凑型输电线路模拟塔和1000kV环-构架模型空气间隙进行了标准操作冲击和长波前操作冲击放电特性对比试验研究。研究结果表明：传统的波前修正方法不合理;随着距离的变大,长波前与标准操作波50%放电电压的比值有变小的趋势。

英文摘要：

The study of UHV switching impulses show that the front time of switching impulse over-voltage in the UHV is longer than that in 500 kV line and it may be several ms, 98 percent of the wave front of the switching over- voltage is more than 3000μs, but the fundamental research about long-fronted switching impulse discharging is limited in our country. We collected many experimental data of long-fronted switching over-voltage, and compared standard switching impulse with long-fronted switching impulse discharging on 750 kV compact transmission line simulated tower and 1000 kV circle-frame model. The results show that the method of classical wave front correction is not appropriate. The ratio of standard switching impulse discharging voltage and long-fronted switching impulse discharging voltage is diminishable as the gap length is larger.