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Traveling wave fault locating method based on multi-measuring-information

A technology of traveling wave fault and localization method, which is applied in directions such as fault locations to enhance redundancy and accuracy, prevent ranging failures, and save equipment investment costs.

Active Publication Date: 2016-11-09
CHINA THREE GORGES UNIV
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Problems solved by technology

Use traveling wave data for fault line selection and distance measurement to prevent fault location failure caused by protection malfunction and other factors

Method used

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  • Traveling wave fault locating method based on multi-measuring-information
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  • Traveling wave fault locating method based on multi-measuring-information

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Embodiment Construction

[0028] A traveling wave fault location method based on multi-measurement information, the steps of which are as follows:

[0029] 1) Optimize the configuration of the traveling wave measurement units in the power grid in advance, the traveling wave positioning master station collects the traveling wave data collected by each measurement unit, and selects the data of some measurement units as the information domain of fault location, that is, the fault distance calculation data source;

[0030] 2) Decoupling the phase-mode transformation of the traveling wave signal to obtain the linear mode and zero mode. The trained neural network obtains the zero-mode wave velocity, and preliminarily estimates the time difference between the initial wave head of the zero-mode and line-mode components arriving at the same detection point. fault distance;

[0031] 3) Preliminarily estimate i fault distances based on the traveling wave data recorded by i measurement units in the information do...

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Abstract

Provided is a traveling wave fault locating method based on multi-measuring-information. Various transformer station measuring units acquire a ground mode component and a line mode component by performing phase-mode transformation decoupling on a received fault initial wave head, solve a ground mode wave velocity in combination with a trained neural network, and preliminarily estimate fault distance according to a difference of the time when the ground mode component and the line mode component reach the same measuring unit. A traveling wave positioning main station determines a suspected fault line set in view of the fault distance estimated by each measuring unit, and positions a fault line in combination with a real-time network topologic structure and a fault traveling wave characteristic. A non-fault line closest to the fault line is selected to compute real-time line mode wave velocity. A fault point distance is accurately computed according to a dual-end or expanded dual-end range finding method. The traveling wave fault locating method based on multi-measuring-information measures the fault distance by using multi-point data, prevents range finding failure caused by the fault of a single device, and increases positioning precision and reliability.

Description

technical field [0001] The invention relates to a traveling wave fault location method based on multi-measurement information, belongs to the field of power system fault investigation, and in particular relates to using regional multi-measurement data to perform fault line selection and distance measurement after a power network is disturbed. Background technique [0002] 1: Traveling wave fault location has developed rapidly due to its fast and accurate characteristics, and the application of traveling wave positioning devices in the power grid has increased rapidly, making it have certain networking conditions, which can integrate traveling waves and relay protection actions in the entire network information to improve the reliability and accuracy of existing fault location methods. [0003] 2: In a complex power network, the transmission path of traveling wave refraction is complicated, and it is difficult to guarantee accurate wave head recognition by the single-ended tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 李振兴王玲吴李群孟晓星李振华
Owner CHINA THREE GORGES UNIV
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