Analysis on structural parameters and electrical performance of dc deep well grounding electrode

Abstract

Deep well-grounding electrodes (DWGE) have advantage of smaller occupied area, and the number of sub-ground electrodes is less than that of the vertical grounding electrodes, thus has a good development prospects. Here, the simulation model of the electrical parameters of the DWGEs is established, and the electrical performance of the same length DWGE and the horizontal grounding electrodes is compared. The influence of length and the cross-sectional diameter on the electrical performance of electrodes is studied. The simulation results and analysis show that compared with the shallow buried horizontal grounding electrodes, the DWGEs have the performance of smaller ground resistance and lower maximum step voltage. By increasing the length of grounding electrodes, the ground resistance, the maximum dissipation current density, and step voltage decrease, the surface potential of the nearby area decreases. Increasing the cross-sectional diameter to improve the electrical performance of electrodes is not obvious, except for the dissipation current density. It is suggested that the length of the DWGEs in the project should not exceed 1500 m and the diameter of the coke is less than 0.4 m.

Keywords

• conductors (electric)
• current density
• earth electrodes
• surface potential
• electrical performance
• dc deep well grounding electrode
• sub-ground electrodes
• vertical grounding electrodes
• electrical parameters
• DWGEs
• cross-sectional diameter
• structural parameter analysis
• ground resistance
• simulation model
• surface potential
• dissipation current density
• shallow buried horizontal grounding electrodes