考虑杆塔影响时架空短线阻抗的计算

Impedance of short overhead lines considering the influence of the towers

为了计算杆塔对架空短线阻抗参数的影响 ,应用Somm erfeld偶极子场理论 ,提出了一种架空短电力线路考虑杆塔电流影响时阻抗的计算方法。计算结果表明 ,在低频情况下杆塔阻抗约占线路总阻抗的 10 %。对相应的无穷上限广义 Somm erfeld积分的计算 ,提出了自适应截断技术 ,将无穷上限积分转化为普通定积分 ,同时 ,积分上限可根据规定的误差限自动选取。该方法可以有效地提高广义Somm

The influence of tower on the impedance of short overhead lines was analyzed using Sommerfeld's dipole field theory, which takes the influence of the current in the towers into account. The result shows that the impedance of the vertical tower is about 10% of the whole impedance at low frequencies. A self adaptive truncation technology is presented to transform the generalized Sommerfeld integral which has an infinite upper limit into a definite integral. The approach improves the precision and calculating speed of Sommerfeld integral.