Study of the Influences on Soil Resistivity Caused by HVDC Mono-polar Operation

摘要

UHVDC transmission system has many advantages, such as transferring large amounts of electrical power over long distances. It plays an important role in the west to east power transmission project. The ground electrode of UHVDC was working in several kA currents for long-term when it works in mono-polar operation. And there is high temperature of the soil around the ground electrode in that time. The normal operation of ground electrode can be impacted by the soil resistivity around it. Porous media model is introduced in this paper. Based on this model, impact of temperature on soil resistivity is presented. And the relationship of current density and soil resistivity is analyzed. Then, an experiment was done to validate it.