Method for identifying lightning failure points of high-voltage direct-current electric transmission line
A technology for DC transmission lines and transmission lines, which is applied to fault locations, detects faults according to conductor types, and measures electricity, etc., and can solve problems such as inability to correctly identify the location of faults, and the failure of traveling wave ranging methods to be widely used.
Active Publication Date: 2017-02-22
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology
[0002] More than 60 years ago, the method of judging the specific location of the transmission line fault point by traveling wave ranging was proposed, but limited by the technical conditions at that time, the traveling wave ranging method was not widely used
The existing traveling wave distance measuring device will be affected by the induced voltage wave generated by the lightning strike on the transmission line for the identification of the head of the traveling wave. Therefore, the traveling wave distance measuring device will measure many suspected fault points and cannot correctly identify the real fault. location
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[0108] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all of the contents related to the present invention.
[0109] like figure 1 As shown, a method for identifying a lightning strike fault point of a high-voltage direct current transmission line includes the following steps:
[0110] Step 1. When the transmission line fails due to lightning strikes, use the traveling wave ranging device on the transmission line tower to obtain the location of the suspected fault point. The distance x between the point and the traveling wave ranging device i (i=1,2,3,...,n).
[0111] Step 2. By analyzing the trip information of the transmission line within t...
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A method for identifying lightning failure points of a high-voltage direct-current electric transmission line comprises the following steps: 1, measuring a plurality of suspected failure points by a traveling wave distance measurement method; 2, judging whether the suspected failure points occur in the distance measurement range of a traveling wave distance measurement device or not, if yes, continuously executing the step 3, otherwise, executing the step 1 again by another traveling wave distance measurement device; 3, determining the longitude and the latitude of the failure points and the longitude and the latitude of the failure of a lightning point; 4, calculating membership degree t of the suspected failure points on a lightning disaster to form a lightning membership degree matrix T of each suspected failure point; 5, comprehensively considering a lightning membership degree matrix and a lightning-caused failure probability matrix to obtain lightning-caused failure possibility matrix G; and 6, judging that the maximum possibility value Gmax on the direct-current electric transmission line is the most possible failure occurring position on the direct-current electric transmission line. By the method, the membership degree of the suspected failure points on the lightning disaster is calculated by different modes according to different conditions, and the identification accuracy of the failure points is improved.
Description
technical field [0001] The invention relates to a method for identifying a lightning strike fault point of a high-voltage direct current transmission line. Background technique [0002] More than 60 years ago, the method of judging the specific location of the transmission line fault point by traveling wave ranging has been proposed, but limited by the technical conditions at that time, the traveling wave ranging method has not been widely used. In the past ten years, due to the continuous development of various technologies, a variety of traveling wave ranging methods have been widely used in power systems. [0003] The voltage traveling wave or current traveling wave has a certain propagation speed on the transmission line, and will be refracted and reflected at the line bus and fault points. When a fault occurs, a fault traveling wave will be generated at the fault point. The traveling wave distance measurement method is to calculate the distance between the fault point ...
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Login to View More IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 李晋伟张怿宁王振黄义隆宋云海王咸斌何珏陈浩宁
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID