Transmission line fault positioning method and positioning device based on traveling wave frequency
A transmission line and fault location technology, applied in the field of power electronics, can solve the problems of reduced fault location accuracy, affecting fault maintenance and recovery, etc., to achieve the effect of improving maintenance recovery speed and accuracy
Pending Publication Date: 2022-04-05
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology
When the traveling wave is transmitted on the transmission line, due to the loss of the line and the refraction phenomenon at the busbar, the frequency of the traveling wave arriving at the busbar is distorted, which is different from the initial traveling wave frequency, so that the frequency of the traveling wave at the busbar is used. The accuracy of fault location is reduced, which affects the repair and recovery of faults
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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0040] In the prior art, when the transmission line fault location is based on the frequency of the traveling wave, there is a loss when the traveling wave is transmitted on the transmission line, and refraction occurs when the traveling wave reaches the busbar, resulting in distortion of the traveling wave frequency obtained at the busbar. There is a difference from the initial traveling wave frequency when the fault occurs. In order to solve this technical problem, the present invention creatively proposes to correct the traveling wave frequency acquired at the busbar to restore the initial traveling wave frequency, thereby improving the accuracy of fault location based on traveling wave frequency.
[0041] figure 1 Shown is a schematic flow cha...
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The invention discloses a power transmission line fault positioning method and positioning device based on traveling wave frequency, and the method comprises the steps: obtaining the frequency spectrum of an original current traveling wave head of each end of a line, correcting the frequency spectrum through employing a loop iteration method, and obtaining the corrected traveling wave head frequency spectrum of each end of the line; respectively acquiring the arrival time of the traveling wave head at each end of the line, and determining the traveling wave head frequency corresponding to the arrival time of the traveling wave head at each end of the line according to the corrected traveling wave head frequency spectrum at each end of the line; determining the traveling wave velocity of each end of the line according to the frequency dependent characteristic and the traveling wave head frequency of each end of the line; and determining a fault position according to the traveling wave speed of each end of the line and the arrival time of the traveling wave head. The traveling wave frequency is corrected through the loop iteration method, and the fault positioning accuracy can be improved.
Description
technical field [0001] The invention belongs to the technical field of power electronics, in particular, it relates to a fault location technology of a power system, and more specifically, it relates to a transmission line fault location method based on traveling wave frequency. Background technique [0002] At present, transmission line fault location methods based on fault traveling waves, especially fault traveling wave frequencies, have been widely used. When the traveling wave is transmitted on the transmission line, due to the loss of the line and the refraction phenomenon at the busbar, the frequency of the traveling wave arriving at the busbar is distorted, which is different from the initial traveling wave frequency, so that the frequency of the traveling wave at the busbar is used. The accuracy of fault location is reduced, which affects the repair and recovery of faults. Contents of the invention [0003] The purpose of the present invention is to provide a tra...
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Login to View More IPC IPC(8): G01R31/08G01R23/16
CPCY04S10/52
Inventor 王栋陈为张典刘喜梅乔峰侯梦倩
Owner QINGDAO UNIV OF SCI & TECH