Line length correction method for traveling wave fault location
A traveling wave fault and line length technology, which is applied to fault locations, measuring devices, instruments, etc., can solve problems such as the reduction of fault location accuracy, and achieve the effects of improving fault location accuracy, accurately eliminating fault points, and reducing manpower.
Pending Publication Date: 2021-11-09
CHINA THREE GORGES UNIV
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Problems solved by technology
[0004] Aiming at the problem that the existing traveling wave ranging method is used for fault location, the applied length parameters are the fixed line length of the transmission line instead of the actual line length, which leads to the problem that the accuracy of fault location is reduced
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[0044] A line length correction method for traveling wave fault location, specifically comprising the following steps:
[0045] S1: According to the transmission line data provided by the power supply company, analyze the absolute value composition of the height difference parameters of the overhead line, and classify the groups at intervals of 3m. Record the absolute value of the tower height difference as h i (i=1,2,...,n), establish the transmission line height difference matrix A=[h 1 ,h 2 ,..., h n ], record the horizontal span of the transmission line corresponding to each height difference as l i (i=1,2,...,n), establish transmission line span matrix B=[l 1 , l 2 ,...,l n ].
[0046] S2: Take pictures of the lines equipped with image recognition equipment, and extract and select the features of the transmission lines through the face correction technology on the acquired images. Considering the complexity of the images taken by power line inspection, in order to...
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The inveniton provides a line length correction method for traveling wave fault location. The method comprises the steps of establishing a power transmission line height difference absolute value parameter matrix and a power transmission line span parameter matrix, obtaining the lowest point position of a line in a corresponding span through an image recognition method, constructing a corresponding coefficient k, obtaining an initial value of the corresponding coefficient k according to the corresponding coefficient k and horizontal distances lOA and lOB, finely adjusting the initial value of the corresponding coefficient k to obtain a corrected value of the corresponding coefficient k; obtaining a complete span error parameter matrix through a ratio parameter of a line length error parameter to a height difference absolute value, and then superposing the corrected line lengths of various groups according to the relationship between the error parameter matrix and an actual line length parameter matrix to obtain the actual bus length Lsum of the power transmission line; performing fault position correction through the corresponding relation between the actual bus length Lsum and the horizontal span lsum of the power transmission line, and obtaining the actual fault position Lx away from the measuring end of the power transmission line. The method aims at avoiding the influence of load current and external environment changes on the actual line length and improving the traveling wave fault positioning precision of the power transmission line.
Description
technical field [0001] The invention relates to the technical field of transmission line fault distance measurement, in particular to a line length correction method for traveling wave fault location. Background technique [0002] Considering the high technical requirements and high cost of cable lines, the main components of modern transmission networks are overhead lines. As the load current of the overhead line and the external environment change, the sag parameters of the overhead line change accordingly, which in turn leads to changes in the actual length of the overhead line. The existing traveling wave ranging formulas all use the transmission time of the traveling wave in the conductor and the fixed line length parameters of the transmission line to locate the fault. Considering that the change of line sag will lead to numerical errors between the actual line length and the fixed line length parameters, so that The fault location changes, affecting the fault locatio...
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Login to View More IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 李振兴崔晓琳张萌萌李振华翁汉琍李成志黄景光
Owner CHINA THREE GORGES UNIV