Construction method of large power station grounding grid under rock geological conditions

Abstract

The invention discloses a construction method of a large power station grounding grid under rock geological conditions. The construction method includes the following steps: production of a vertical grounding electrode; mechanical drilling; installation of the vertical grounding electrode; proportioning, stirring and pouring of a resistance reducing agent; clay backfilling and tamping of the grounding electrode; connection between grounding buses and grounding buses, and connection between the grounding buses and the grounding electrode; connection and installation of a grounding module; corrosion prevention at welding places; and clay backfilling and tamping of the grounding buses. The construction method of the invention adopts an advanced grounding construction process, reasonably selects a product combination for reducing the resistance value, and has obvious resistance reduction effects on areas with difficult resistance reduction construction such as mountainous areas, areas withhigh soil rate and arid areas in North China; for the installation of the vertical grounding body, only the prepared grounding electrode and a physical resistance reducing agent need to be inserted and poured into holes after mechanical drilling, so that the construction method is simple and convenient; and the construction method combines the physical resistance reducing agent and the groundingmodule, and the vertical grounding body with high construction difficulty is replaced by a horizontal grounding body, so that the construction workload is effectively reduced, materials are saved, pollutions are reduced, and obvious economic efficiency is realized.

Description

technical field [0001] The invention belongs to the technical field of power station grounding grid construction, and in particular relates to a construction method for a large-scale power station grounding grid with rock geological conditions. Background technique [0002] The grounding grid plays an important role in ensuring the safe and stable operation of the system as the grounding of AC and DC equipment and lightning protection grounding in power stations, wind turbines, and substations. With the development of energy construction concepts of economy, energy conservation and emission reduction, and green environmental protection, the construction sites of large-scale power stations and wind power generating units generally choose pollution-free coastal, mountainous and Gobi Desert, but the underground rock geological structure is not suitable for power stations. , wind turbines, and substation grounding grid construction caused great difficulties. In the early days, t...

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Problems solved by technology

With the development of energy construction concepts of economy, energy conservation and emission reduction, and green environmental protection, the construction sites of large-scale power stations and wind power generating units generally choose pollution-free coastal, mountainous and Gobi Desert, but the underground rock geological structure is not suitable for power stations. , wind turbines, and substation grounding grid construction caused great difficulties. In the early days, technological means such as blasting technology to break rocks and fill soil, excavate ground wells and then backfill soil were used to install centralized grounding electrodes. Although the effect of reducing the resistance value can be achieved, It meets the requirements of the design resistance value, but consumes a lot of manpower, material resources and financial resources, which is neither scientific nor economical

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