Calculation of performance of UHVDC grounding electrode under the consideration of the self-resistivity of electrode

The performance parameters of UHVDC cirque grounding electrode are computed by 3D finite element method when self-resistance of grounding electrode is involved in. This paper compare grounding performance of single-cirque, double-cirques and three-cirques grounding electrode on condition of same electrode length. At the same time, because double-layer soil can instead of a majority of uneven soil, so a series of influencing factor of grounding performance such as electrode's depth of burial, top-layer soil resistivity and bottom-layer soil resistivity are analyzed when considered uneven soil model.