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Multi-terminal line fault positioning method and system based on wavelet transform

A technology of wavelet transform and line fault, applied in fault location, information technology support system, fault detection according to conductor type, etc., can solve the problem of large positioning error

Inactive Publication Date: 2020-08-11
ANHUI ELECTRIC POWER FUYANG POWER SUPPLY +1
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Problems solved by technology

The impedance method uses the known system parameters and the steady-state power frequency after the fault to write the fault location equation, and obtains the location of the fault point by solving the equation. Due to changes in the operating mode and frequency, the system impedance and line parameters will change. , this method will inevitably produce large positioning errors in practical applications

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  • Multi-terminal line fault positioning method and system based on wavelet transform
  • Multi-terminal line fault positioning method and system based on wavelet transform
  • Multi-terminal line fault positioning method and system based on wavelet transform

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terminology used ...

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Abstract

The invention discloses a multi-terminal line fault positioning method and system based on wavelet transform. The method comprises the steps that a detected power transmission line is monitored, signal information obtained through monitoring is uploaded to a data acquisition card, the data acquisition card carries out A / D conversion on the acquired signal information and then synchronously transmits the signal information to a main control computer, and the main control computer stores sampling information; phase-mode transformation processing is carried out on the signal information; the moment is determined when the fault initial wave arrives at the measurement point; and a multi-terminal power transmission line fault branch judgment matrix is constructed, and a fault branch is found outthrough the multi-terminal power transmission line fault branch judgment matrix. The method effectively solves the practical problems that an existing fault distance measurement method cannot identify a branch where a fault is located, is low in distance measurement precision and is easily affected by various factors.

Description

technical field [0001] The invention relates to the technical field of transmission line fault diagnosis, in particular to a multi-terminal line fault location method and system based on wavelet transform. Background technique [0002] Accurate and fast transmission line fault location is of great significance for the timely restoration of power transmission after the fault. The existing fault location methods are mainly aimed at two-terminal lines, and some transmission systems (especially in secondary transmission networks) still have more three-terminal or multi-terminal lines. Therefore, it is of practical significance to study accurate and fast fault location methods for multi-terminal transmission lines. [0003] The fault location of multi-terminal transmission lines is more difficult than that of double-terminal lines. For the fault location of multi-terminal transmission lines, the key is to find the fault branch and then locate the fault point. There is still a la...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 崔超奇刘斌董苏安玲程亚航郭运泽朱杰胡慧敏王蕊刁哲伟张剑东卢家奎杨海龙
Owner ANHUI ELECTRIC POWER FUYANG POWER SUPPLY
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