Design of Grounding Grid for Main Substations in High Soil Resistivity Areas Based on CDEGS Software
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 7
Abstract
Objective To address the difficulty of reducing the grounding resistance of main substations in high soil resistivity areas, it is necessary to study the design of grounding grids for main substations in such regions. Method Combining the geographical location conditions and soil resistivity characteristics of the main substation, a reasonable quantity of horizontal grounding conductors is determined using single-variable method. The improvement effects of contact potential, step voltage, and grounding resistance are analyzed using CDEGS simulation software when horizontal grounding conductors are arranged in exponential non-uniform distribution. Optimization measures to reduce grounding resistance are proposed. Result & Conclusion After increasing the quantity of horizontal grounding grid conductors to a certain extent, the marginal effect of the conductors decreases significantly. The vertical grounding electrode has little effect on reducing the grounding resistance of the main substation and is not recommended for use in the design. With the use of deep well grounding electrodes, both the contact potential and step voltage of the main substation are significantly reduced, and the grounding resistance is reduced to below 0.5 Ω, meeting the requirements in related specifications.
Authors and Affiliations
Jianshe CAO
Keywords
Related Articles
- EP ID EP742640
- DOI 10.16037/j.1007-869x.2024.07.056
- Views 45
- Downloads 0
Thoughts on Coordination and Minimization of Urban Rail Transit Systems
［Objective］ Current urban rail transit system faces issues such as information silos and low coordination efficiency, which hinder the ability to meet the demands for digital transformation, high safety, and high autom...
Cause Analysis of Seepage Disaster in Deep Foundation Pit of Metro Station in Karst Stratum
Objective In-depth study should be made on the seepage stability during deep foundation pit excavation in water-rich karst stratum in consideration of the water inrush disaster at the side wall or bottom of the pit durin...
Establishment and Application of Wireless Fingerprint Library for Urban Rail Transit Vehicle-wayside Communication
Objective Currently, wireless environment detection for urban rail transit vehicle-wayside communication primarily relies on manual testing with instruments, which is labor-intensive and inefficient. To meet the needs fo...
Impact of Large-span Civil Defense Tunnel Project Under-passing Construction on Structural Stability of Existing Metro Tunnel Intervals
Objective To analyze the construction impact of new large-span civil defense tunnel on metro tunnel interval structural stability when under-passing existing metro line with a small clear distance, it is necessary to con...
Pantograph-Catenary Relation of Urban Rail Transit Lines under Catenary Iced Condition
［Objective］ Under the condition of ice forming on catenary surface (hereinafter referred to as ′iced condition′), the normal current collection of train pantograph is disrupted. In severe cases, arcing may occur betwee...