Abstract:In order to improve the accuracy of distributed parameter calculation of the distribution network line, this paper presents an effective method for calculating the distribution parameters while the space line goes through non-ideal ground under lightening condition. First, aiming at the problem of corona and skin effect caused by the high amplitude and high frequency of lightening current, the corona onset characteristic and skin effect characteristic of space line are analyzed. and the corresponding equivalent model of transmission line is established. Secondly, for the problem that space line goes through non-ideal ground, t the distributed parameters of transmission line are analyzed by complex image method. Finally, in order to study the influence of skin effect on line distribution parameters, the relationship between line resistance and inductance with frequency under complex image depth algorithm is analyzed and calculated. The analysis of the paper shows that the method based on the complex image depth algorithm is more accurate. At the same time, with the increase of frequency, the distributed resistance of the line increases and the distributed inductance decreases.