Simplified calculation method for maximum temperature rise of earth electrode in deep well

Abstract

The invention relates to the technical field of earthing, in particular to a simplified calculation method for the maximum temperature rise of an earth electrode in a deep well. By means of the method, the maximum temperature rise of the earth electrode in the deep well can be obtained in a simplified mode, and the cost is low. The simplified calculation method for the maximum temperature rise ofthe earth electrode in the deep well comprises the steps that the earth electrode in the deep well can be simplified into an infinite-length cylinder model, a heat-conduction partial differential equation of the infinite-length cylinder model is solved, and the maximum temperature rise of the earth electrode in the deep well is obtained. The simplified calculation method is applied in the design and performance detection of the earth electrode in the deep well.

Description

technical field [0001] The invention relates to the technical field of grounding, in particular to a simplified calculation method for the maximum temperature rise of a deep well grounding electrode. Background technique [0002] Compared with the conventional shallow-buried horizontal ground electrode, the deep well ground electrode has the advantages of small coverage area and low investment. Similar to the horizontal ground electrode, temperature rise is one of the key factors to be considered in design. [0003] When the HVDC works in unipolar mode, the system current flows between the ground electrode on each side and the earth. When the HVDC works in bipolar mode, the ground electrode also provides a path for balanced current. These components, especially the soil, have much higher resistivity than coke and electrode conductors during the current flow, so they will heat themselves, especially for land ground electrodes, because most electrodes have large dimensions, re...

AI Technical Summary

Problems solved by technology

These components, especially the soil, have much higher resistivity than coke and electrode conductors during the current flow, so they will heat themselves, especially for land ground electrodes, because most of the electrodes have a large size, reaching a steady state The time is very long, and considering the impact of the electrodes on the environment and the AC grid, it is almost impossible for the HVDC system to run for a long time in unipolar mode, which requires obtaining the maximum operating time of the HVDC system in unipolar mode, and The maximum running time is determined by the maximum temperature rise of the grounding electrode. Solving the maximum temperature rise of the grounding electrode through the design formula requires a lot of manpower, material and financial resources, and the cost is high

Images