Fault location method based on single-terminal location

A fault location and single-ended ranging technology, applied in fault location, information technology support systems, etc., can solve the problem that intelligent substations cannot achieve double-ended ranging, and achieve the effect of strong adaptability

Active Publication Date: 2011-11-23
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the operation of existing distance measuring devices and the problem that intelligent substations cannot realize double-terminal ranging at the present stage, it is necessary t

Method used

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  • Fault location method based on single-terminal location
  • Fault location method based on single-terminal location
  • Fault location method based on single-terminal location

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Embodiment Construction

[0047] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0048] figure 1is a flowchart of this embodiment. First of all, when the transmission line fails, the transmission line traveling wave fault location device measures the power frequency electrical quantity of the M-side bus of the transmission line, determines the range of the fault point through the impedance method, and estimates the transition resistance value; according to the data of the power frequency electrical quantity, Analyze the transient voltage / current traveling wave by wavelet transform, and judge whether the fault is a common short-circuit fault or a special short-circuit fault; if it is a common short-circuit fault, use the single-ended traveling wave method combined with the line length to directly calculate the location of the fault point; if it is a special short-circuit fault If there is a fault, th...

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Abstract

The invention provides a fault location method based on single-terminal location. The method is characterized by using a transmission line travelling wave fault location device to measure the power frequency quantity of a home terminal bus of a transmission line when short circuit happens to the transmission line, determining the fault point range by an impedance method and estimating the transition resistance; then analyzing the transient voltage/current travelling waves through wavelet transform and adopting a single-terminal travelling wave method combined with the length of line to directly compute the positions of the fault points if the faults are judged to be common short circuit faults; and adopting a transmission line single-terminal fault location method combining the impedance method and the travelling wave method to compute the positions of the fault points if the faults are judged to be special short circuit faults. The method has the following beneficial effects: the accuracy of fault location is ensured by utilizing the single-terminal travelling wave method, can be within 500m and is not affected by such factors as the length of line and the like; and the method can adapt to fault location under the condition of different fault types and is basically not affected by such factors as the transition resistance, the line structure, the system operation mode and the like.

Description

Technical field: [0001] The invention relates to the field of power system automation, in particular to a fault location method based on single-end ranging. Background technique: [0002] After the transmission line fails, even if the reclosure is successful, line inspectors are required to find the fault point, and judge whether the line can continue to operate or whether it needs to be powered off for maintenance according to the degree of damage caused by the fault, so as to eliminate hidden dangers. Therefore, quickly finding the fault point after the line fault becomes a key technology to ensure the safe and stable operation of the power grid. Among them, in 110kV and above power grids, transmission line fault location devices are widely used in power stations where the neutral point is directly grounded, which fully demonstrates its importance to the safe, stable and reliable operation of the power system. [0003] With the development of smart grid construction, the ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 覃剑郭宁明
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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