The Expected Values of Self- and Mutual Impedances of Overhead Lines and Impacts of on Sags and Phase Conductor Imbalances: Part 2

초록

This paper presents a method that finds the expected values of self- and mutual impedances of overhead lines with the uncertainties such as the ground resistivity, conductor characteristics, and transmission line structures. For this purpose, this study designs a stochastic random sampling method that removes the uncertainties. A finite element analysis method that includes a single logarithmic closed-form solution to Carson's improper integral is adopted. The impact of an increase in sags and an imbalance in phase conductors on self- and mutual impedances is examined. As a result, the expected values of the self- and mutual impedances of an overhead line are evaluated. It is also shown that as the sag ratio increases, the self- and mutual impedances decrease.

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