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Method for testing lightning trip-out rate of transmission tower in low-soil-resistivity region

A technology of lightning tripping rate and soil resistivity, which is applied in environmental/reliability testing, measuring electricity, measuring devices, etc.

Active Publication Date: 2020-03-06
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Southern Power Grid and its subsidiaries have carried out a large number of lightning protection transformation and special technical rectification measures for transmission lines in recent years, but the vast areas of the five provinces of China Southern Power Grid are located in tropical and subtropical monsoon regions, especially Guangdong, Guangxi, and Hainan are located in coastal areas. Thunder and lightning activities are frequent all year round, and lightning's intrusion on power transmission facilities is always unavoidable

Method used

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  • Method for testing lightning trip-out rate of transmission tower in low-soil-resistivity region
  • Method for testing lightning trip-out rate of transmission tower in low-soil-resistivity region
  • Method for testing lightning trip-out rate of transmission tower in low-soil-resistivity region

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Experimental program
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Effect test

Embodiment 1

[0072] Such as figure 1 As shown, a test platform for lightning tripping rate of transmission towers in areas with low soil resistivity includes an impulse voltage generator 11, a data measurement and analysis control module 17, a wireless current sensor 7, a coaxial cable 24, a first base tower 21, a second Base tower 22, third base tower 23, lightning protection line 1 81, lightning protection line 2 82, A-phase line 91, B-phase line 92, C-phase line 93;

[0073] The output end of the impulse voltage generator 11 is connected with the SPDT switch 8 through the coaxial cable 24, and leads to the injection point, and the wireless current sensor 7 is socketed on the coaxial cable 24;

[0074] 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;

[0075] The first base tower 21 includes a tower main body one 101, a phase A insulator string...

Embodiment 2

[0080] A method for testing the lightning strike tripping rate of transmission towers in areas with low soil resistivity, comprising the following steps:

[0081] S1: Simulate a lightning strike on the top of a transmission line tower, and conduct a counter-attack lightning resistance level test;

[0082] S2: For areas with low soil resistivity, ρ<=100Ω·m, where ρ is the soil resistivity, change the soil resistivity of soil 18 in the sand tank 5, starting from 10Ω·m, take a soil resistance every 10Ω·m rate, and repeat the first step to measure the counter-attack lightning resistance level under the soil resistivity;

[0083] S3: Calculate the theoretical value I of counter-attack lightning resistance level under different soil resistivity by the following formula y0 :

[0084]

[0085] In the formula, I y0 is the theoretical value of counter-lightning withstand level, L is the total length of the conductor of the grounding device, B is the shape factor, l is the geometri...

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Abstract

The invention provides a method for testing the lightning trip-out rate of a transmission tower in a low-soil-resistivity region. The method is characterized in that a test platform is built, and theplatform comprises an impulse voltage generator, a data measurement analysis control module, a wireless current sensor, a single-pole double-throw switch, a coaxial cable, a first base tower, a secondbase tower, a third base tower, a first lightning conductor, a second lightning conductor, an A-phase line, a B-phase line and a C-phase line. A particle swarm algorithm is used to optimize the counterattack lightning withstand level and shielding failure lightning withstand level formulas based on an actual test result, and finally the lightning trip-out rate is calculated based on the optimizedresult. The method has the beneficial effect that the lightning trip-out rate of the transmission tower in the low-soil-resistivity region can be tested more truly by using the particle swarm algorithm.

Description

technical field [0001] The invention relates to the technical field of lightning measurement and protection, and more specifically, to a method for testing the lightning tripping rate of transmission towers in areas with low soil resistivity. Background technique [0002] With the continuous expansion of the scale of the power grid, the area covered by the transmission line is increasing day by day, and many lines span thousands of miles. Due to the long transmission distance and wide spanning range, it is inevitable to pass through natural disaster-prone areas such as mountains and valleys. Operation experience shows that shielding trips of multi-circuit lines on the same tower mostly occur in mountainous areas, where strong lightning has a great impact on the shielding lightning resistance level of lines, resulting in a high rate of shielding trips. According to statistics on the reasons for tripping of 110kV and above lines, lightning is the most important cause of line t...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/003
Inventor 陈道品陈斯翔舒应军刘益军屈勇何子兰唐琪周华敏李恒真曾庆辉
Owner GUANGDONG POWER GRID CO LTD
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