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Spiral needling type tower grounding device based on spark enhancement effect

A technology of enhancing effect and grounding device, applied in the direction of tower, building type, bendable conductor, etc., can solve the problems of difficult to guarantee long-term effect, reduce the soil resistivity of towers, easy to corrode, etc., and increase the cost of infrastructure and construction area. , Improve the level of lightning protection, reduce the effect of impact grounding impedance

Pending Publication Date: 2021-08-24
STATE GRID SHANDONG ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual operation, due to land acquisition and other issues, the actual construction area of ​​the tower is often limited
In the case of high soil resistivity and limited construction area, it is usually difficult to reduce the grounding resistance of towers
The traditional method of reducing grounding resistance by extension grounding can reduce the grounding resistance of towers, but there are problems such as long extension and difficulty in finding areas with low soil resistivity
The use of galvanized steel vertical grounding body can reduce the soil resistivity of the tower, but there are problems such as high construction cost and easy corrosion
The use of materials such as drag-reducing agents can reduce the grounding resistance of towers to a certain extent, but with the effects of rainfall and other effects, some drag-reducing agents have problems such as soil pollution and long-term effectiveness.

Method used

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  • Spiral needling type tower grounding device based on spark enhancement effect
  • Spiral needling type tower grounding device based on spark enhancement effect
  • Spiral needling type tower grounding device based on spark enhancement effect

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0031] The tower of the 110kV overhead transmission line is a four-base cast-in-place pile foundation, the depth of each pile foundation is H=10m, and the diameter is D=1.2m. When installing the spiral needle-punched grounding device, one coil is wound at an interval of s=1 meter, and the number of coils to be wound is n=H / s=10.

[0032] The calculation formula (1) of the spiral line is as follows:

[0033]

[0034] In the formula, L is the length of the helical flexible graphite composite grounding cable; n is the length of the helical flexible graphite composite grounding cable and the number of turns; D is the diameter of the pile foundation; the distance between.

[0035] Therefore, the length of flexible graphite composite grounding cables required for each pile foundation during actual construction is 38.98 meters, and a total of four flexible graphite composite grounding cables of 38.98 meters are required.

[0036] If one set of acupuncture devices is installed fo...

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Abstract

The invention relates to a tower grounding device of an electric power system, in particular to a spiral needling type tower grounding device based on a spark enhancement effect, and belongs to the field of lightning protection and grounding of power transmission and distribution lines of the electric power system. The device comprises a flexible graphite grounding cable (1), needles (3) and metal connecting pieces (2), the metal connecting pieces (2) are sequentially arranged on the flexible graphite grounding cable (1) from top to bottom, and the needles (3) are fixed to the flexible graphite grounding cable (1) through the metal connecting pieces (2). The spiral needling type tower grounding device is simple in structure and reasonable in design, is resistant to corrosion and is long in service life, the tower grounding resistance reducing construction area and cost can be saved, but also the tower impact grounding resistance can be effectively reduced, the lightning resistance of a power transmission line is improved, and the spiral needling type tower grounding device has higher practicability.

Description

technical field [0001] The invention relates to a grounding device for a pole tower in a power system, in particular to a spiral needle-punched grounding device for a pole tower based on a spark enhancement effect, and belongs to the field of lightning protection and grounding for power transmission and distribution lines in a power system. Background technique [0002] The lightning protection performance of the transmission line is directly related to the grounding performance of the tower. Reducing the grounding resistance of the tower can effectively reduce the lightning overvoltage in the transmission line and improve the lightning resistance level of the line. However, in actual operation, due to issues such as land acquisition, the actual construction area of ​​the tower is often limited. In the case of high soil resistivity and limited construction area, it is usually difficult to reduce the grounding resistance of towers. The traditional method of reducing groundin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/66H01B7/06H01B7/04E04H12/00E02D27/12E02D27/42
CPCH01R4/66H01B7/065H01B7/04E04H12/00E02D27/12E02D27/42
Inventor 高鹏李宋林刘宏光曹付勇宋凯马涛王一夔赵世文孙辉吕高阳
Owner STATE GRID SHANDONG ELECTRIC POWER
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