A method for measuring ground grid impact grounding resistance under the influence of different soil pH

A technology for impacting grounding resistance and soil pH, applied in the direction of grounding resistance measurement, etc., it can solve the problems of threatening equipment and personnel safety, large transient ground potential rise, etc., and achieve the effect of easy layout

Active Publication Date: 2019-10-18
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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Problems solved by technology

If the impact grounding resistance of the grounding grid of power plants and substations is too large, a large transient ground potential rise will occur, and in severe cases, it will also threaten the safety of equipment and personnel

Method used

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  • A method for measuring ground grid impact grounding resistance under the influence of different soil pH
  • A method for measuring ground grid impact grounding resistance under the influence of different soil pH
  • A method for measuring ground grid impact grounding resistance under the influence of different soil pH

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Embodiment 1

[0046] Such as figure 1 As shown, a ground grid impact grounding resistance measurement method under the influence of different soil pH includes the following steps:

[0047] Step 1: On-site pilot research

[0048] Select the soil resistivity ρ near the pole tower as 200Ω·m, the longest side length L1 of the grounding grid is 20m, and the cross-sectional area S1 of the grounding grid is 25*πmm 2 , the rectangular area S2 surrounded by the four sides of the grounding grid is 100m 2 area as the test area.

[0049] Step 2: Select the measurement point and assemble the combined experimental device

[0050] Select nine points on the grounding grid as measurement points, among which the four top corners of the grounding grid are 1, 2, 3, and 4 points respectively; 7, 8 o'clock; the center point of the grounding grid is 9 o'clock. The buried depth of the PH sensors is 0.8H, each sensor measures the PH value of the corresponding point, and the collected data is transmitted to the...

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Abstract

The present invention provides a ground grid impulse grounding resistance measurement method under influences of different soil acidities and alkalinities. The method comprises the steps of: 1) investigating a measured tower grounding grid condition; 2) building a soil acidity and alkalinity test system near a tower grounding grid according to a field condition; 3) performing point selection detection of the soil acidity and alkalinity distribution condition around the measured grounding grid; 4) calculating and obtaining one influence weight of data of each measurement point on the whole impulse grounding resistance; and 5) calculating and obtaining the impulse grounding resistance considering the grounding grid acidity and alkalinity distribution of the tower grounding grid according tothe acidity and alkalinity data of a test point. According to an actual condition, the method provided by the invention can effectively and accurately calculate the conditions of the grounding grid impulse grounding resistance in different acidities and alkalinities, and can effectively determine a line operation state when the tower is suffered from lightning stroke through calculation of the impulse grounding resistance; and moreover, a test platform is easy to arrange, and therefore, the method provided by the invention is simple and effective, and is suitable for different conditions.

Description

technical field [0001] The invention relates to the field of lightning protection and grounding of electric power systems, and more specifically, relates to a method for measuring the impact grounding resistance of a ground network under the influence of different soil pH. Background technique [0002] The safe operation of the tower in the power transmission system is closely related to its lightning protection characteristics, and the impact characteristics of the tower grounding device will directly affect its lightning protection effect. The impact characteristics of the tower grounding device mainly refer to the characteristic that the lightning current spreads to the surrounding earth through the grounding device. During this transient process, the impact grounding resistance and transient ground potential of the grounding device usually increase. It is determined by the impact grounding resistance of the transmission line tower grounding device, which will affect the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/20
Inventor 李恒真舒应军刘晓华林锦沛陈斯翔张鸣欧晓妹曾庆辉王云飞董镝
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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