On the Effects of EMI and the Soil Structure on Transmission Line Parameters — Part II: Impacts on Fault Locators

Abstract

This paper presents a methodology for computing the electrical parameters of overhead transmission lines accounting for metallic pipeline interferences and soil stratification effects. The method is based on the closed-form analytical solution of the Carson’s integral, which is used to calculate self and mutual line parameters. The Alternative Transients Program (ATP) is used to simulate six short-circuit scenarios on a 60 Hz, 230 kV transmission line 200 km long, considering a hypothetical case of interferences with a pipeline and soil stratification based on resistivity measurements. Results show that zero sequence impedances are affected significantly due to the presence of the interfering structure, yielding errors of about 13% in phase-to-ground fault locations.