A method for measuring impact grounding resistance considering the temperature of the ground network

A technology of impact ground resistance and measurement method, applied in the direction of ground resistance measurement, etc., can solve the problems of increasing line tripping rate, affecting power supply stability, threatening power plant and substation equipment, etc., and achieves the effect of easy layout

Active Publication Date: 2019-10-22
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the voltage is greater than the voltage of the transmission line, the line will be counterattacked, which will seriously threaten the equipment of the power plant and substation, and will increase the tripping rate of the line and affect the stability of power supply

Method used

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  • A method for measuring impact grounding resistance considering the temperature of the ground network
  • A method for measuring impact grounding resistance considering the temperature of the ground network
  • A method for measuring impact grounding resistance considering the temperature of the ground network

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Experimental program
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Effect test

Embodiment 1

[0047] Such as figure 1 As shown, a method for measuring the impact grounding resistance considering the temperature of the ground grid includes the following steps:

[0048] Step 1: On-site pilot research

[0049] The grounding grid is selected to be as deep as H=0.8m from the ground, and the length of the longest side of the grounding grid is L 1 is 20m, the cross-sectional area of ​​the grounding grid S 1 25*πmm 2 The rectangular area S surrounded by the four sides of the grounding grid 2 100m 2 , lightning impulse current I m The area of ​​70kA is used as the test area, and the soil resistivity of this area is ρ is 150(Ω.m -1 ).

[0050] Step 2: Select the measurement point and assemble the combined experimental device

[0051] Take nine measuring points in the whole grounding grid, among which the four corners of the grounding grid are respectively selected as points 1, 2, 3, and 4; points 5 and 6 are selected at the bottom of the grounding grid; Choose 9 points....

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Abstract

The invention provides an impact grounding resistance measurement method considering a ground network temperature. The method comprises the following steps of 1) according to a site condition, constructing a pole and tower ground network temperature test system; 2) selecting points and detecting a measured grounding network surrounding temperature distribution condition; 3) calculating and acquiring an influence weight of data of each measurement point on an integral impact grounding resistance; and 4) according to test point temperature data, calculating and acquiring the impact grounding resistance of a pole and tower ground network considering the ground network temperature. In the invention, based on an actual work condition, a condition of the impact grounding resistance considering the ground network temperature can be limitedly and accurately calculated and acquired; through calculating the impact grounding resistance, a line operation state when a pole and tower is hit by lightning strike can be effectively determined; and a test platform is easy to arrange, is simple and effective, and is suitable for various conditions.

Description

technical field [0001] The invention relates to the field of lightning protection and grounding of electric power systems, and more particularly relates to a method for measuring impact grounding resistance taking into account the temperature of the ground network. Background technique [0002] The safe operation of the tower in the power transmission system is closely related to its lightning protection characteristics, and its lightning protection effect will be directly affected by the impact characteristics of its grounding device. In the process of lightning striking the tower, the lightning current diffuses into the ground through the tower and its grounding device, and in this transient process, a certain voltage drop must be formed on the impact grounding resistance. If the voltage is greater than the voltage of the transmission line, the line will be counterattacked, which will seriously threaten the power plant and substation equipment, and will increase the trip r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/20
Inventor 欧繁陈道品李恒真陈铸成陈斯翔董镝刘益军何胜红宋安琪黄静
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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