Grounding system of shielded type direct current grounding electrode and converter station grounding grid having the same address

Abstract

The invention discloses a grounding system of a shielded type direct current grounding electrode and a converter station grounding grid having the same address. The grounding system of a shielded type direct current grounding electrode and a converter station grounding grid having the same address includes a direct current shielded electrode 2 surrounding a converter station grounding grid 10, and a direct current grounding electrode 1 surrounding the direct current shielded electrode 2, wherein the direct current grounding electrode 1 is used for grounding the direct current; and the direct current output from the direct current grounding electrode 1 flows into the direct current shielded electrode 2 so as to prevent the direct current to flow by the converter station grounding grid 10. The grounding system of a shielded type direct current grounding electrode and a converter station grounding grid having the same address utilizes the unique current shielding structure design to enable the direct current grounding electrode and the converter station grounding grid to safely locate at the same address, thus removing the line for leading a traditional direct current grounding electrode from the converter station to the outside for tens of kilometers and the electrode address expropriation requirement, and being compact in structure. The grounding system of a shielded type direct current grounding electrode and a converter station grounding grid having the same address avoids corrosion destruction caused by the direct current flowing by the converter station grounding grid, and avoids interference caused by potential difference formed in the converter station grounding grid on the converter station control protection system.

Description

technical field [0001] The invention belongs to the technical field of electric power system grounding, and in particular relates to a grounding system in which a shielded DC grounding electrode and a grounding grid of a converter station are co-located. Background technique [0002] DC transmission is an important part of my country's power system, and the operation mode of single pole earth loop is its special operation mode. Since DC current has a strong electrolytic corrosion effect on metals in the soil, in order to prevent DC current from flowing through and corroding the ground grid of the converter station, it is necessary to install a separate DC ground electrode dozens of kilometers away from the converter station. This requires tens of kilometers of lines and hundreds of meters in diameter of DC grounding pole land acquisition, which is expensive and inconvenient to maintain. [0003] More importantly, my country's industry is developing rapidly, the power grid c...

AI Technical Summary

Problems solved by technology

This requires tens of kilometers of lines and hundreds of meters in diameter of DC grounding poles, which is expensive and inconvenient to maintain

[0003] More importantly, my country's industry is developing rapidly, the grid coverage density is getting higher and higher, and there are more and more various industrial and civil underground pipe networks. The space suitable for DC grounding electrode installation is getting smaller and smaller, and land acquisition is very difficult, which affects our country Development of direct current transmission system

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