Detailed terrain data-based transmission line failure-shielding and lightning-protection performance evaluation method

A technology of transmission lines and terrain data, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of small calculation value of shielding trip rate, inability to accurately reflect the influence of terrain shielding lightning protection performance, and ground fluctuations Larger problems, to achieve the effect of refined management of power grids, true and reliable evaluation results, and improved lightning protection performance

Active Publication Date: 2011-05-25
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

At present, landform extraction is usually determined by manual estimation by power grid operators; because the on-site measurement of ground inclination is very difficult, the current extraction of ground inclination is also basically based on manual estimation, and the estimated results are very different from the actual situation; the conductors caused by ground undulations The change of ground altitude is basically not considered in the current shielding lightning protection calculation, but for mountainous large-span towers, due to large fluctuations in the ground, especially across large valley areas, the ground

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  • Detailed terrain data-based transmission line failure-shielding and lightning-protection performance evaluation method
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  • Detailed terrain data-based transmission line failure-shielding and lightning-protection performance evaluation method

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[0026] Hereinafter, the embodiments of the present invention will be further described with reference to the accompanying drawings.

[0027] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 , Picture 9 As shown, the present invention uses line information that needs to be evaluated for shielding lightning protection performance, including line basic information, line geographic information, line structure characteristics, line insulation characteristics, and uses GIS software to scan the three-dimensional coordinates of the transmission line corridor. The three-dimensional coordinates of the scanning points in the vertical direction of the line corridor determine the landform and ground inclination along the line. The three-dimensional coordinates of the scanning points along the line determine the height change of the ground guide line caused by the ground ups and downs. The fine terrain data extracted based on the three-dimensio...

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Abstract

The invention discloses a detailed terrain data-based transmission line failure-shielding and lightning-protection performance evaluation method. The method comprises the following steps of: acquiring statistical lightning data of a line corridor in a specified time period by a lightning parameter statistical method by adopting line basic information, line geographic information, line structural characteristics and line insulation characteristics; scanning a three-dimensional coordinate of a transmission line corridor by using geographic information system (GIS) software; determining the landscape along a line and a ground angle according to the three-dimensional coordinate in the direction vertical to the line corridor; determining wire-to-ground height variation caused by surface undulation according to the three-dimensional coordinate in the direction along the line, and acquiring detailed terrain data along the line by three-dimensional GIS scanning; calculating the shielding failure trip-out rate of each base tower according to the detailed terrain data extracted based on the GIS scanning; and acquiring real line failure-shielding and lightning-protection evaluation data in the specified time period by comparing a design value, a specified value or an operation experience value of the line failure shielding trip-out rate with a reference value of the line failure shielding trip-out rate. Therefore, the line failure-shielding and lightning-protection performance evaluation is realized.

Description

technical field [0001] The invention relates to the field of power grid lightning protection, in particular to a performance evaluation method for shielding lightning protection of transmission lines based on fine terrain data, which is suitable for evaluating the shielding lightning protection performance of high-voltage, ultra-high voltage and ultra-high voltage overhead transmission lines in power systems. Background technique [0002] China's existing power grid lightning protection system is mainly composed of the external defense of the transmission line and the core defense of the substation. According to relevant information, because the transmission line is located in the wilderness and stretches for thousands of miles, it is the ground facility that is most likely to be struck by lightning. Although the relevant departments A variety of lightning protection technical measures have been taken, but line tripping caused by lightning strikes still ranks first among all ...

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Application Information

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IPC IPC(8): G01R31/00
Inventor 谷山强赵淳陈家宏冯万兴李晓岚谢耀恒童雪芳卢恩泽吴焯军丁黎
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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