高海拔 500 kV 交流线路空气间隙及海拔修正试验研究

Ｒesearch on Air Gap Selection and Altitude Correction of 500 kV AC Transmission Lines in High Altitude Areas

摘要:

介绍了在海拔 4300 m 地区对 500 kV 直线塔模拟塔头导线 － 塔身空气间隙的操作冲击放电、雷电冲击放电和 工频放电特性试验研究，实验得到了塔头空气间隙不同电压的放电特性曲线。根据海拔 0 m 和海拔 4300 m 地区的 500 kV 塔头间隙的试验结果，采用插值法，计算得到了不同海拔地区的塔头空气间隙的放电电压，同时得到了海拔 4000 ～ 5500 m 地区塔头间隙冲击放电电压的海拔校正系数，推荐了适用的海拔校正方法。最后，给出了海拔 4000 m 以上 500 kV 输电线路所需的最小空气间隙距离值。 电

Abstract:

In the region with the altitude of 4300 m，the researches on the characteristic tests of switching impulse discharge， lightning impulse discharge and power frequency discharge of line － tower air gaps are carried out on the simulation tower head of 500 kV tangent tower，and the discharge characteristics curves under different voltages are obtained． Based on the experimental data of tower head air gaps at altitude of 0 m and 4300 m，the discharge voltages of tower head air gap at the different altitudes are obtained，and the altitude correction coefficients for discharge voltages of tower head air gap at altitude of 4000 ～ 5000 m are also obtained through interpolation method． Finally，the minimum air gap required by 500 kV transmission lines at altitude of 4000 m and above is given and the applicable altitude correction method is recommended．