杆塔绝缘子串风偏角的验算鄢鹏

8.92°Р雷电过电压:θ=tg-1[(Pj/2+S×g4×Lh×n+2T×sinβ/2×n)/(Wj/2+Wd×Lv×n+Wz)]=tg-1{[28.13/2+275.96×0.0052762×483+2×18157.89×sin(2.5°/2)]/(350/2+0.9222×460×10)}=19.05°РN9号直线塔为1B1Y1-ZM3型单回角钢塔,其θ工频max=53°、θ操作max=28°、θ雷电max=14°;应此,N9号塔垂直线路方向位移10m后其雷电过电压、操作过电压时的摇摆角均大于1B1Y1-ZM3塔塔头电气间隙圆最大摇摆角值。不满足电气间隙要求。Р解决方法:1、顺线路方向调整杆塔位置;Р调整杆塔呼高;Р更换杆塔型号;Р增加重锤。Р以调整杆塔呼高及增加重锤为例:Р调整杆塔呼高Р原线路杆塔呼高为30m,现将其调整为36m,调整后N9号塔垂直档距Lv=641m,改变后摇摆角计算可得:Р工频电压:θ=tg-1[(Pj/2+S×g4×Lh×n+2T×sinβ/2×n)/(Wj/2+Wd×Lv×n+Wz)]=tg-1{[205/2+275.96×0.0326938×483+2×24402.87×sin(2.5°/2)]/(350/2+0.9222×641×10)}=42.23°<53°Р操作过电压:θ=tg-1[(Pj/2+S×g4×Lh×n+2T×sinβ/2×n)/(Wj/2+Wd×Lv×n+Wz)]=tg-1{[63.3/2+275.96×0.0118714×483+2×18936.10×sin(2.5°/2)]/(350/2+0.9222×641×10)}=21.85°<28°Р雷电过电压:θ=tg-1[(Pj/2+S×g4×Lh×n+2T×sinβ/2×n)/(Wj/2+Wd×Lv×n+Wz)]=tg-1{[28.13/2+275.96×0.0052762