Abstract
The current distribution of the grounding electrode in a high-voltage direct current (HVDC) transmission system affects the state of power equipment in its vicinity, which depends on the soil resistivity and shape of the grounding electrode. In this paper, current distribution in the vicinity of an ±800 kV grounding electrode is investigated by simulation and experiments. Firstly, the model to calculate the current distribution with two typical frozen soils is set up, and simulation models and experimental platforms are established; meanwhile, the finite element method (FEM) is used to calculate the current and potential dispersion of linear, cross-shaped, and ring-shaped grounding electrodes in the simulation models. After obtaining the lab current data from the simulation, an innovative method based on a “drainage wire” with a Hall sensor is proposed to measure the current in an experimental setup. The results show that current and potential distribution characteristics are related to the shape of the grounding electrode and soil resistivity. Meanwhile, the current measurement scheme can measure the current in soil with a lower error. This article concludes that these two typical models can reduce the complexity of frozen soil analysis, and the measurement scheme can accurately monitor the current to reduce the damage to the surrounding power equipment.
Highlights
high-voltage direct current (HVDC) transmission systems have reached a voltage level of ±1100 kV, and the stable operation of the grounding electrode is critical for the reliable operation of HVDC systems [1]
Three-layer and mixed-layer soil models are proposed to calculate the current distribution in the vicinity of the grounding electrode, which considers the influence of frozen soil distribution in the vicinity of the grounding electrode, which considers the influence of frozen soil and the electric field
The results show that the best to worst order of the dispersion characteristics of the three grounding electrodes is as follows: ring-shaped, cross-shaped, and linear
Summary
HVDC transmission systems have reached a voltage level of ±1100 kV, and the stable operation of the grounding electrode is critical for the reliable operation of HVDC systems [1]. Used electrodes inthe a DC transmission system and analyzed the influence layersthe finite element method to study of typical models andetmulti-layer such as the crust, mantle, and the coresurface for the potential potential distribution distribution on. Yang et al to developed grounding electrode monitoring system that can collect finite element method study the asurface potential distribution of typical soil models and multi-the grounding current, temperature, and humidity at the grounding electrode site [9]. Is necessary to study and design a weak current measurement device to be soiloraround theTherefore, grounding placed in the soil around the grounding electrode. Three-layer and mixed-layer soil models are proposed to calculate the current distribution in the vicinity of the grounding electrode, which considers the influence of frozen soil distribution in the vicinity of the grounding electrode, which considers the influence of frozen soil and the electric field.
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