超/特高压输电线路工频参数文件的制作方法

超/特高压线路导线间距、位置差别较大,造成导线的自阻抗、自导纳互阻抗和互导纳等参数相差较大.文章探讨带修正系数k1至k6的线路参数计算公式,根据导线（避雷线）不同换位段的物理结构计算导线参数使其与实测工频参数一致,制作出不同换位段精确的导线参数文件.对不同换位段的线路采用特征模量分解方法计算转移矩阵；将各换位段的矩阵顺序相乘得到整条线路转移矩阵；从而计算出导线的正序阻抗、正序导纳、零序阻抗和零序导纳.改变修正系数k1至k6使计算的导线参数为精确值,由此计算的导线正序和零序参数与实测值相等.该方法获得的导线参数文件可以为更精确的工程计算提供技术支持.

The method of establishing parameter data file for EHV/UHV power circuits

The considerably large interval and position difference in conductors of EHV/UHV power lines gives rise to differences among self-impedance, mutual-impedance, self-susceptance and mutual- susceptance of conductors. Conductor parameter calculation equations with coefficient of correction are discussed. Based on the physical construction of conductors（lightning arrester line） in different trans- position block, conductor parameters are calculated and data files of different transposition block are established. The transfer matrix of different transposition block power lines is calculated via the eign- analysis method. The transfer matrix of the whole power line is derived by orderly multiplication of the matrix of different transposition blocks. The positive-sequence impedance, positive-sequence, posi- tive-susceptanc, zero-sequence impedance and. zero-sequence susceptance are obtained based on the transfer matrix of the power line. Through comparing the positive-parameters and zero-parameters with measured ones in practice, the coefficient of correction is altered to accurately calculate the conductor parameters of different transposition block power lines. The results indicate that the calculated posi- tive-parameters and zero-parameters are very close to the measured ones in practice. The power line data files created by the method can be used for engineering calculations.