A differential lightning protection method and system for transmission lines
A transmission line, differentiated technology, applied in the direction of overhead lines/cable equipment, etc., can solve problems such as lightning shielding of transmission lines, achieve the effects of avoiding lightning tripping, improving the protection ability of lightning disasters, and reducing the probability of lightning shielding
Active Publication Date: 2022-05-27
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0010] Aiming at the deficiencies of the prior art, the present invention provides a differential lightning protection method and system for transmission lines, which solves the problem that in the prior art, when there is a strong thunderstorm, the wind direction of the strong wind is perpendicular to the transmission line or has a large intersection angle, which is easy to induce power transmission The problem of lightning shielding on the line
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[0038] In order to make the purposes, features and advantages of the present invention more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the following description The embodiments described above are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0039] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments.
[0040] The technical problem to be solved by the present invention is: aiming at the problem in the prior art that the tr...
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The invention discloses a differential lightning protection method for a power transmission line, comprising: obtaining historical lightning data of a lightning protection target area; arranging the dates in the historical lightning data in descending order according to the number of daily lightning and ground flashes to obtain a list of lightning days in descending order; Extract multiple strongest lightning days in order from the daily descending table, obtain the continuous period of lightning occurrence in each strongest lightning day, and use the micro-meteorological station of the transmission line to obtain the average wind speed and wind direction data of continuous periods; when the preset protection is met conditions, start the lightning shielding differentiated lightning protection; protection activation conditions include: the average wind speed is greater than the preset wind speed threshold, and the wind direction meets the preset wind direction range. The invention provides a differential lightning protection method and system for transmission lines, which can significantly reduce the probability of lightning strikes on transmission lines perpendicular to the dominant wind direction of squall lines, thereby effectively avoiding lightning tripping of transmission lines caused by wind deflection and lightning flashover, and improving Lightning disaster protection capability of transmission lines.
Description
technical field [0001] The invention relates to the technical field of lightning protection of power transmission lines, in particular to a method and system for differential lightning protection of power transmission lines. Background technique [0002] Affected by factors such as wind speed and terrain, transmission lines are susceptible to lightning strikes, and the impact is most prominent when the wind direction is vertical to the transmission line. In order to ensure the safe operation of the transmission line, the power department has set the design wind speed of the transmission line under the condition of considering various operating conditions, and the system safety can be guaranteed below the design wind speed. In order to adapt to the lightning wind speed characteristics in different regions, the current "110-750kV Overhead Transmission Line Design Regulations" stipulates that 15m / s is used as the tower wind deflection design standard in areas with high wind spe...
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IPC IPC(8): H02G1/02
CPCH02G1/02
Inventor 刘贯科
Owner GUANGDONG POWER GRID CO LTD
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