750kV敞开式变电站雷电侵入波过电压的研究

以某750kV敞开式变电站为例,建立了同杆双回架空进线方式的AIS系统模型;研究了雷电侵入波过电压计算模型的误差及其影响因素,采用ATP对雷电侵入波过电压进行了计算。结果表明,①三种杆塔模型计算结果相差近7%,最好采用多波阻杆塔模型,以免造成较大误差;②当杆塔冲击接地电阻在10Ω以上时,MOA上的残压急剧上升,对设备的安全运行造成较大威胁;③变电站接地电阻对过电压值影响不大;④地面倾角增大,变电站内部各设备的过电压值及流过MOA的最大电流也随之增加,山区线路防雷尤为重要。

Study on the Lightning Intruding for 750kV AIS Substation

On the basis of an actual 750 kV AIS substation, the 750 kV AIS system model with double circuit is established in this work. Errors and its effecting factors of calculating model for over-voltage invasion were investigated and the calculation was made using ATP program. The result shows: 1.discrepancy between calculation on three tower models reaches nearly 7% and model with multi wave resistance is preferable. 2. the residual voltage of MOA rises rapidly while the impulse ground resistance of the tower being above 10 Ω,which threaten reliable service of installations. 3. ground resistance of substation has no effect on over-voltage amplitude. 4. as the ground dip angle increases, the over-voltage amplitudes on substation installations and maximum discharge current of MOA rise which is very essential for lightning protection in mountainous regions.