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A method for measuring tower impact grounding resistance considering soil moisture distribution in space

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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  • 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 tower impact grounding resistance considering soil moisture distribution in space
  • A method for measuring tower impact grounding resistance considering soil moisture distribution in space
  • A method for measuring tower impact grounding resistance considering soil moisture distribution in space

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Experimental program
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Embodiment 1

[0045] Such as figure 1 As shown, a tower impact grounding resistance measurement method considering the soil moisture distribution includes the following steps:

[0046] Step 1: On-site pilot research

[0047] Select the length of the longest side of the ground grid L 1 is 20m, the cross-sectional area of ​​the grounding grid S 1 25π(mm) 2 , the rectangular area S surrounded by the four sides of the grounding grid 2 100m 2 The area is used as the test area, the lightning current amplitude I m =55kA.

[0048] Step 2: Select the measurement point and assemble the combined experimental device

[0049] Select nine points on the ground grid as measurement points (such as Figure 2-3 shown), where the four vertices of the ground grid are points 1, 2, 3, and 4 respectively; the midpoints of the lower sides of the ground grid are points 5 and 6 respectively; The center point is 9 o'clock. The buried depth of the moisture sensors is 0.8H (m), and each sensor measures the soi...

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Abstract

The invention provides a pole and tower impact grounding resistance measurement method considering soil space moisture distribution. The method comprises the following steps of 1) investigating measured pole and tower information; 2) according to a site condition, constructing a soil space moisture distribution test system; 3) selecting points and detecting a surrounding soil moisture distributioncondition of a measured grounding network; 4) calculating and acquiring an influence weight of data of each measurement point on an integral impact grounding resistance; and 5) according to test point soil water content data, calculating and acquiring the impact grounding resistance of a pole and tower ground in different soil space moisture distribution. In the invention, based on an actual workcondition, the impact grounding resistance when soil space moisture distribution is unbalanced can be 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 tower impact grounding resistance measurement method considering soil space moisture distribution. 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 rate of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/20
Inventor 陈斯翔李恒真欧繁李洪涛陈道品陈邦发罗容波何子兰欧晓妹宋安琪
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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