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Method for obtaining ionization discharging initial field intensity of soil around grounding conductor under impulsion

A technology of impact discharge and grounding body, which is applied in the high voltage field, can solve the problem of lack of line-plate gap discharge characteristics, and achieve the effect of uniform field strength

Active Publication Date: 2017-06-13
STATE GRID CORP OF CHINA +4
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the forms of discharge gaps used in soil discharge research are mainly point-plate, point-point, ball-ball, but in practice, the grounding body is usually rod-shaped, so it lacks the discharge characteristics of the line-plate gap

Method used

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  • Method for obtaining ionization discharging initial field intensity of soil around grounding conductor under impulsion
  • Method for obtaining ionization discharging initial field intensity of soil around grounding conductor under impulsion
  • Method for obtaining ionization discharging initial field intensity of soil around grounding conductor under impulsion

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Embodiment Construction

[0028] see figure 2 As shown, a method of the present invention to obtain the initial field strength of the ionization discharge of soil around the grounding body under impact is applied to a device for observing the characteristics of the impact discharge of soil around the grounding rod. The device includes a return electrode 1 and a grounding Rod 2: The return electrode adopts a coaxial metal cylinder structure, and the ground rod under test is placed on the axis.

[0029] The return electrode 1 adopts a coaxial metal cylinder structure and is divided into three sections: both ends are symmetrically arranged voltage equalizing sections 21, and the middle straight section 22 is a testing section. The equalizing section 21 includes an equalizing ring 210 , a quarter arc section 211 and a straight line section 212 connected in sequence; the straight line section 212 is separated from the test section 22 by an insulating cylinder 24 .

[0030] The outer contour of the pressur...

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Abstract

The invention discloses a method for obtaining ionization discharging initial field intensity of soil around a grounding conductor under impulsion. An earth rod and a cylindrical backflow electrode structure are adopted to test, and a changing curve of the resistance of the soil between the earth rod and the backflow electrode is measured, wherein the resistance of the soil changes along with applied impulse voltages; a slope of the changing curve is adopted to deduce a real voltage of ionization discharging, and through an electromagnetic field theory, the corresponding ionization discharging initial field intensity of the soil around the ground connector is obtained. Because the ionization discharging initial field intensity of the soil around the grounding conductor under the impulsion is obtained through the resistance variation of the soil between the earth rod and the cylindrical backflow electrode, results are more objective; because the earth rod and the cylindrical backflow electrode structure are adopted to test, the earth-rod surface field intensity is more uniform. The method can be applied in measuring discharging features of the soil around the ground connector and instructing grounding engineering construction.

Description

technical field [0001] The invention relates to the field of high-voltage technology, in particular to a method for measuring the initial field strength of soil ionization discharge around a grounding conductor. Background technique [0002] In order to meet the needs of work and safety in the power system, it is often necessary to connect some parts of the power system and its electrical equipment to the earth, which is grounding. Power system grounding can be divided into three types: working grounding, lightning protection grounding and protective grounding in terms of its purpose. Among them, lightning protection grounding is to avoid the harm of lightning. Lightning protection equipment such as lightning rods, lightning conductors and arresters must be equipped with corresponding grounding devices to guide lightning current into the earth. [0003] Because the lightning current is very large, it will generate a high potential gradient in the soil when it flows into the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1263
Inventor 王森张波孙强李志忠齐卫东时卫东薛军吴锦鹏康鹏成林牛博高峰吕新良何金良曾嵘
Owner STATE GRID CORP OF CHINA
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