Fault online positioning method and device for cable overhead mixed line

A technology of hybrid line and positioning method, which is applied in the direction of fault location, satellite radio beacon positioning system, measuring device, etc., can solve the problem of inability to locate cable overhead mixed line faults, shorten fault finding time, reduce power failure loss, improve The effect of electricity reliability and efficiency

Pending Publication Date: 2022-04-26
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an online fault location method and device for cable overhead hybrid lines

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  • Fault online positioning method and device for cable overhead mixed line

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Example Embodiment

[0038] Example 1

[0039] The present embodiment provides a fault online location method for cable overhead hybrid lines, comprising the following steps:

[0040] Detection points are set up in each terminal station and intermediate transfer station in the hybrid line, and the traveling wave voltage signal, traveling wave current signal and power frequency current signal are obtained separately in each detection point, and the hybrid line includes cable lines and overhead lines;

[0041] According to the change of the power frequency current signal in the entire hybrid line, determine the preliminary fault positioning interval, and determine whether it belongs to the cable line fault or the overhead line fault; the preliminary fault positioning interval is a section of the line between the adjacent terminal station and the intermediate transfer station in the hybrid line;

[0042] If it is a cable line fault, the fault point location is determined by the traveling wave voltage sig...

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Abstract

The invention relates to a fault on-line positioning method and device for a cable overhead mixed line, and the method comprises the steps: setting detection points in each terminal station and a middle switching station in the mixed line, and obtaining a traveling wave voltage signal, a traveling wave current signal and a power frequency current signal in each detection point, the mixed line comprises a cable line and an overhead line; according to the change of a power frequency current signal in the whole mixed line, determining a preliminary fault positioning interval, and judging whether the fault belongs to a cable line fault or an overhead line fault; if the fault is the cable line fault, determining the position of a fault point through a traveling wave voltage signal in a detection point of an accessory of a preliminary fault positioning interval; and if the fault is the overhead line fault, determining the position of a fault point through a traveling wave current signal in a detection point of an accessory of the preliminary fault positioning interval. Compared with the prior art, the method has the advantages that the fault point can be accurately positioned, the cost is low, the installation is convenient and safe, and the fault finding time can be effectively shortened.

Description

technical field [0001] The invention relates to the technical field of transmission network fault diagnosis, in particular to an online fault location method and device for cable overhead hybrid lines. Background technique [0002] For the urban power transmission network, it is difficult to accurately determine the fault section and location only relying on the distance measurement method in the substation for the fault segmentation and location of the cable-overhead line hybrid line. The determination of the fault section is mainly to distinguish which section the fault occurs in, and for the hybrid line, the fault is located in the overhead line or the cable line. [0003] With the advancement of electronic technology and the development of communication technology, the cost of station-side distance measuring devices is decreasing, satellite time synchronization technology is becoming more and more perfect, and the voltage and current from the secondary side of the system...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01S19/46G08C17/02
CPCG01R31/083G01S19/46G08C17/02
Inventor 许强袁奇叶頲何邦乐王骁迪原佳亮朱亦嘉楼铁城吴辰斌杨凡孙伟莎王振兴
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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