有限长架空导线与地下导线间互阻抗的计算

Mutual Coupling Between Finite Overhead Conductors and Underground Conductors

通过对地场广义 Sommerfeld积分折射系数和衰减系数的合理近似 ,导出了有限长架空导线与地下导线间互阻抗的解析计算公式。结果表明 ,当计算频率 <几百 k Hz时精度相当好 。

An analytical formula of the mutual impedance between overhead conductors and underground conductors is presented by means of the reasonable approximation of refraction and attenuation coefficients of generalized Sommerfeld integral in the earth field. It is shown, by the numerical results, that the formula herein is highly accurate below the frequency limit of several hundred kHz and can be applied in the inductive coupling analysis and the electromagnetic transient calculation between the power line and the underground telecommunication line.