Differentiated lightning protection method and system for power transmission line
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
Active Publication Date: 2021-02-19
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 purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following description The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0039] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0040] The technical problem to be solved by the present invention is: in view of the problem in the prior art that the power transmission ...
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The invention discloses a differentiated lightning protection method for a power transmission line. The differentiated lightning protection method comprises the following steps: acquiring historical lightning data of a lightning protection target area; arranging dates in the historical lightning data in a descending order according to the number of times of daily lightning ground flashover to obtain a lightning day descending order table; sequentially extracting a plurality of strongest thunder and lightning days from the thunder and lightning day descending list, obtaining continuous time periods of thunder and lightning in each strongest thunder and lightning day, and obtaining average wind speed and wind direction data of the continuous time periods by utilizing a power transmission line micro-meteorological station; when a preset protection starting condition is met, starting lightning protection shielding failure differential lightning protection; wherein the protection starting condition comprises that the average wind speed is greater than a preset wind speed threshold, and the wind direction meets a preset wind direction range. The invention provides a differentiated lightning protection method and system for a power transmission line, and the method and system can remarkably reduce the probability that the power transmission line perpendicular to the prevailing wind direction of a squall line is shielded by lightning stroke, thereby effectively avoiding the lightning stroke tripping of the power transmission line caused by windage yaw lightning stroke flashover, and improving the lightning stroke disaster protection capability of the power transmission line.
Description
technical field [0001] The invention relates to the technical field of lightning protection for transmission lines, in particular to a differential lightning protection method and system for transmission lines. Background technique [0002] Affected by factors such as wind speed and terrain, transmission lines are susceptible to lightning shielding, and the impact is most prominent when the wind direction is perpendicular to the transmission line. In order to ensure the safe operation of transmission lines, the electric power department sets the design wind speed of transmission lines 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 should be used as the wind deflection design standard for towers in areas with high win...
Claims
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Login to View More IPC IPC(8): H02G1/02
CPCH02G1/02
Inventor 刘贯科
Owner GUANGDONG POWER GRID CO LTD