Deep well resistance-reducing packing

Abstract

The invention discloses a deep well resistance-reducing packing which mainly comprises the following components in parts by weight: 10-50 parts of conducting materials, 10-50 parts of curing agent, 0.5-25 parts of leavening agent and 0.1-10 parts of retarding agent, wherein the conducting material is selected from one or more of sodium salts, potassium chloride, calcium chloride and graphite; thecuring agent is selected from one or more of polyvinyl alcohol, aluminosilicate (kaolin), sodium silicate, calcium sulfate and cement; the leavening agent is selected from one of polyacrylamide and bentonite; and the retarding agent is selected from one of sodium methylenebisnaphthalenesulfonate and peregal. The deep well resistance-reducing packing has the advantages of saving of 15-30 percent of water quantity, good peaceability with water, no demixing and convenience for site configuration and construction: in addition, no demixing is caused, the solidifying time is prolonged and the flowability and the permeability are enhanced, therefore, no bridging phenomenon is caused during pouring, resistance reduction efficiency is increased, the quantity of deep wells is reduced, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of conductive materials, in particular to a resistance-reducing material used in the construction of deep well grounding devices, the main classification number of which is H01B1 / 06. Background technique [0002] In areas with high soil resistivity or restricted areas, in order to achieve the designed safe grounding resistance value, the usual method is to develop the depth of the area, which is the deep well grounding technology often used in grounding projects. [0003] The resistance reducing agent is a kind of composite material used for grounding devices, wrapped around the horizontal and vertical grounding electrodes, and can reduce the grounding resistance. Due to its low resistivity and increased contact area, it can effectively reduce the contact resistance between the electrode and the soil. The resistance reducing agent is widely used in the grounding devices of substations and distribution stati...

AI Technical Summary

Problems solved by technology

[0004] In the deep well grounding construction, the traditional drag reducer needs more water in the slurry mixing process (the general ratio: drag reducer: water = 2:1), and water and material will appear in a short period of time (generally 2 hours). Stratification, when backfilling the well, the drag-reducing agent "bridges" and cannot completely fill the grounding well, resulting in a grounding resistance higher than the design value. At the same time, the fluidity becomes poor due to stratification, which also brings problems to the high-pressure pump equipment.

[0005] Because there is no retarder in the traditional drag reducer, the slurry will solidify soon (generally 4 hours), which not only brings waste in construction

Poor fluidity and permeability due to solidification, resulting in grounding resistance not reaching the minimum

[0006] In order to meet the requirement of reducing the resistance, the number of deep wells is often only increased in the project. At this time, the electrical shielding factor between the deep wells has to be considered, which leads to a substantial increase in the direct cost of the project and the transformation cost.