Insulation structure of the upper end of the deep-well grounding electrode

Abstract

The invention belongs to the field of deep well type grounding poles, and specifically relates to an upper end insulation structure of a deep well type grounding pole. The structure comprises an insulating sheath; a feed electrode comprising a first feed electrode and a second feed electrode, the first feed electrode wrapping the insulating sheath from a certain depth to the top end; steel sleevesincluding a first steel sleeve and a second steel sleeve, the first steel sleeve wrapping the insulating sheath from a certain depth to the top end, wherein when the deep well type grounding pole isinstalled, the second feed electrode and the second steel sleeve can be pulled and taken out from the deep well. The upper end insulation structure of the deep well type grounding pole provided by theinvention can ensure ground insulation of the steel sleeves and a section of the feed electrode from a certain depth of the deep well to ground, and can also ensure leakage of DC current from a partbelow an insulation treatment section of the electrode well.

Description

technical field [0001] The invention belongs to the field of deep well type grounding electrodes, and in particular relates to an upper end insulation structure of deep well type grounding electrodes. Background technique [0002] Existing high-voltage DC grounding poles generally use horizontal shallow buried grounding poles, which occupy a large area and are difficult to select sites in economically developed DC receiving end areas. China Southern Power Grid has tried to apply vertical grounding electrodes in a few recent DC projects. The length of the electrode wells is 30-40m. Generally, the independent grounding electrodes of a single DC project also need 50-60 electrode wells, and the electrode wells need to be arranged in a ring. Although the floor area is reduced compared with the horizontal shallow buried ground electrode, the construction floor area is still relatively large. After the completion of the construction, dozens of wellheads exposed to the ground will p...

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Problems solved by technology

However, due to the limitation of drilling technology, during the process of lowering the steel casing and the feed electrode, the material at the upper end needs to bear the overall weight of the lowered object, so steel materials must be used to meet the tensile requirements. After the lowering is completed, the upper end of the 150m part is difficult to remove

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