Power distribution network hybrid line traveling wave fault positioning method and device, equipment and medium
A technology for traveling wave faults and mixed lines, which is applied to fault locations, measuring devices, and fault detection according to conductor types, and can solve problems such as the inability to accurately locate traveling wave faults in mixed lines of distribution networks
Pending Publication Date: 2021-12-31
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
[0003] The invention provides a method, device, equipment and medium for locating a traveling wave fault of a hybrid line in a distribution network, which are used to solve the technical problem that the prior art cannot realize accurate positioning of a traveling wave fault of a hybrid line in a distribution network
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[0055]The line of multi-support air line-cable hybrid distribution network, because the line involves two types of lines, overhead line and cable, has the problem of different traveling wave speeds in each section of the line, so that the traveling wave distance measurement cannot directly use the traditional single-ended, Two-terminal traveling wave ranging method. In view of this, the embodiment of the present invention provides a method, device, equipment and medium for locating traveling wave faults of hybrid lines in distribution network, which are used to solve the problem that the prior art cannot realize accurate positioning of traveling wave faults of hybrid lines in distribution network question.
[0056] 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 dr...
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The invention discloses a power distribution network hybrid line traveling wave fault positioning method and device, equipment and a medium for solving the technical problem that accurate positioning of a power distribution network hybrid line traveling wave fault cannot be realized in the prior art. The method comprises the steps that a preset power distribution network line is decomposed into a plurality of T-shaped lines, and each T-shaped line is provided with three branch sections; the preset power distribution network line is a multi-branch overhead line-cable hybrid power distribution network line; a fault branch section is determined according to the propagation time of the fault traveling wave reaching the tail end of each branch section of each T-shaped line; when the fault branch section has a plurality of nodes, a traveling wave time parameter of each node between the fault branch sections is calculated, and a fault section is determined according to the traveling wave time parameter; and the wave velocity of the fault traveling wave in the fault section and the time difference of the fault traveling wave reaching the two ends of the fault sectionacquiring , and positioning a fault position point on the fault section according to the wave velocity and the time difference.
Description
technical field [0001] The invention relates to the technical field of fault location, in particular to a traveling wave fault location method, device, equipment and medium of a hybrid line in a distribution network. Background technique [0002] The structure of 10-60kV medium-voltage distribution network is complex, mostly tree-like branch structure, and the current urban distribution network not only has intricate branches, but also uses cables in the core area in order to save line corridors in the core area of the city. Therefore, In the power grid, there are often distribution lines composed of multiple overhead lines and cables. Due to the insulating medium of the cable itself, the traveling wave velocity in the cable is low, generally 1 / 2 or 2 / 3 of the traveling wave velocity of the overhead line. Therefore, for the overhead-cable hybrid line, there is a problem that the traveling wave velocity of each section of the line is different, so that the traveling wave ra...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 白浩钟振鑫袁智勇高士森雷金勇郭振锋潘姝慧张胜强周长城卓定明郭琦李冠桥孙奇珍余文辉
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD