A method for checking the lightning shielding performance of lines

A line and lightning technology, applied in the field of line lightning shielding performance verification, can solve the problems that the influence of shielding trip rate cannot be reflected, and the influence of shielding trip rate is not considered, so as to improve lightning protection performance and accurate evaluation results Effect

Inactive Publication Date: 2011-12-28
STATE GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] 1) It cannot reflect the influence of terrain condition changes between the two towers (that is, within a span) on the shielding trip rate;
[0006] 2) It cannot reflect the influence of the change of the rel

Method used

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  • A method for checking the lightning shielding performance of lines
  • A method for checking the lightning shielding performance of lines
  • A method for checking the lightning shielding performance of lines

Examples

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Embodiment Construction

[0021] Hereinafter, the present invention will be further described through specific embodiments in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the method for checking the shielding performance of the transmission line considering the terrain conditions along the line, the relative geometric position along the line and the phase of the operating voltage of the line proposed by the present invention, in the implementation, specifically adopts the following steps:

[0023] (1) Input of transmission line information

[0024] Given the transmission line information that needs to be checked for lightning shielding performance, including basic line information (line name, voltage level, total line length, number of segments in each span), line structure characteristics (tower type, ground wire Model, ground wire sag, span length, insulator string structure string length), line insulation characteristics (insulator string or shortest air gap flash...

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Abstract

The invention provides a lightning shielding performance checking method, which divides the span of each line along the entire line into a specified number of sections, and uses a computer to check the relative geometric positions of the ground wires along the line, lightning parameters, topography along the line, and operating voltage of the line in each section. According to the sorting results, the lightning tripping rate calculation method is used to calculate the shielding tripping rate of the line and each span, and according to the relative deviation of the lightning shielding tripping rate of each span to accurately locate the lightning shielding weak point of the line. The present invention checks the lightning shielding performance of the transmission line and takes into account the influence of the terrain condition change of each section in the line span, the relative geometric position change of the ground wire and the phase change of the working voltage of the line, and the evaluation result of the shielding performance of the transmission line is more accurate. Accurate, more authentic and reliable.

Description

technical field [0001] The invention relates to the field of power grid lightning protection, in particular to a lightning shielding performance checking method for a line, which is suitable for evaluating the lightning shielding performance of an overhead power transmission line with a voltage level of 500kV and above in a power system. Background technique [0002] The number of lightning strike trips of overhead transmission lines with a voltage level of 500kV and above in the power system accounts for a relatively high proportion of the total trips. Especially for UHV transmission lines, the probability of other types of faults is very small, and the main fault is lightning shielding trips. The lightning tripping rate of UHV lines in the former Soviet Union accounted for 84% of the total tripping times. From 1993 to September 2007, 1000kV lines in Japan had a total of 68 trips, of which 67 were lightning trips, accounting for 98% of the total trips. Therefore, the verif...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
Inventor 何慧雯谷定燮周沛洪戴敏娄颖李振强李志军严飞
Owner STATE GRID ELECTRIC POWER RES INST
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