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Evaluation method of lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity

A technology of soil resistivity and lightning resistance level, applied in the direction of testing circuit, testing dielectric strength, etc., can solve the problem of simulation test system lacking lightning resistance performance of transmission line system, etc., and achieve the effect of improving lightning resistance performance

Active Publication Date: 2021-07-13
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing research on lightning protection of transmission line systems mainly relies on simulation, but lacks a simulation test system for the lightning resistance performance of transmission line systems, and there is no research on high lightning tripping rates in areas with high soil resistivity. Therefore, a The lightning resistance level evaluation method of transmission lines in areas with high soil resistivity and the establishment of a test platform provide a solid foundation for improving the lightning resistance performance of transmission lines and lightning protection design for lines, and provide important information for improving the safe operation and stability of distribution network lines in the future. Assure

Method used

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  • Evaluation method of lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity
  • Evaluation method of lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity
  • Evaluation method of lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity

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Embodiment 1

[0048] A method for evaluating the lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity. First, a test platform is built, such as figure 1 As shown, the platform includes an impulse voltage generator 11, a data measurement analysis control module 17, a wireless current sensor 7, a coaxial cable 24, a first base tower 21, a second base tower 22, a third base tower 23, and a lightning protection line 81. Lightning protection line two 82, A-phase line 91, B-phase line 92, C-phase line 93;

[0049] The output end of the impulse voltage generator 11 is connected to the tower top of the first base tower 21 through the coaxial cable 24, and the wireless current sensor 7 is socketed on the coaxial cable 24;

[0050] The first lightning protection line 81 and the second lightning protection line 82 respectively connect the first base tower 21 , the second base tower 22 and the third base tower 23 in series.

[0051] The first base to...

Embodiment 2

[0056] A method for evaluating the lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity, based on the built test platform, the test steps include:

[0057] S1: Simulate a lightning strike on the top of a transmission line tower, and conduct a lightning resistance level test;

[0058] S2: For areas with high soil resistivity, 500Ω·m<ρ<=1000Ω·m, where ρ is the soil resistivity, change the soil resistivity of the soil 18 in the sand tank 5, starting from 550Ω·m, every interval is 50Ω·m Take a soil resistivity, and repeat step S1 to measure the lightning resistance level under the soil resistivity;

[0059] S3: Calculate the theoretical value I of the lightning resistance level under different soil resistivities by the following formula:

[0060]

[0061] In the formula, L is the total length of the grounding device conductor, h is the buried depth of the grounding device, d is the diameter of the grounding device conductor, ...

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Abstract

The invention provides a method for evaluating the lightning resistance level of a lightning strike transmission line in a high soil resistivity area. The first base tower, the second base tower, the third base tower, the first lightning protection line, the second lightning protection line, the A-phase line, the B-phase line, and the C-phase line, and simulate the working condition of the lightning strike on the top of the transmission tower, and measure the lightning resistance of the line level, change the soil resistivity, and obtain the lightning withstand level of the line in areas with high soil resistivity, and finally optimize the theoretical formula of the lightning withstand level by combining the measured values ​​with the particle swarm algorithm. The beneficial effect of the present invention is that it provides a method for evaluating the lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity, and builds a test platform to provide a solid foundation for the design of lightning protection for transmission lines, and it also provides an important guarantee for the safe operation of power grid lines .

Description

technical field [0001] The invention relates to the technical field of lightning protection for transmission lines, and more specifically, to a method for evaluating the lightning resistance level of transmission lines struck by lightning in areas with high soil resistivity. Background technique [0002] With the rapid development of power grid construction, the scale is expanding day by day, but a safe, reliable and stable power system is the goal pursued by power grid researchers. In areas with high soil resistivity, it is difficult to reduce the grounding resistance of towers to a low level for transmission lines, resulting in flashover of transmission line insulators, low lightning resistance level, and high lightning tripping rate, which seriously endangers the safety and stability of the power supply system. Therefore, it is particularly important to develop a system and method for evaluating the lightning resistance level of transmission lines struck by lightning in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/14
CPCG01R31/12G01R31/14
Inventor 陈斯翔武利会陈道品彭涛吴江一刘益军张鸣何子兰李恒真黎小龙
Owner GUANGDONG POWER GRID CO LTD
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