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Distribution network fault early warning method and system based on transient waveforms

A technology of transient waveform and fault early warning, applied in the direction of fault location, etc., can solve the problems of poor feasibility and low accuracy of distribution network faults

Active Publication Date: 2015-11-18
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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Problems solved by technology

However, after five years of statistics on the causes of failures in a certain power supply bureau, excessive line load is not the main cause of distribution network failures, and it is difficult to establish a direct relationship between line load changes and failures
Therefore, it is not feasible and accurate to predict distribution network faults based on load

Method used

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  • Distribution network fault early warning method and system based on transient waveforms
  • Distribution network fault early warning method and system based on transient waveforms
  • Distribution network fault early warning method and system based on transient waveforms

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Embodiment Construction

[0053] like figure 1 As shown, the distribution network fault warning method based on transient waveforms includes the following steps:

[0054] S20: Obtain the current transient waveform corresponding to the current disturbance event of the distribution network line.

[0055] With the development of information technology and online monitoring technology, the modern smart grid has begun to take shape. Power quality monitoring devices and systems, transient wave recording devices and other online monitoring methods for power grids can detect disturbance events when a fault occurs and before the fault occurs. Transient voltage and transient current are detected, which provides a data basis for analyzing the law of disturbance events before the fault occurs. In this embodiment, the current disturbance event of the distribution network line refers to various power quality problems that cause power quality pollution due to voltage or current waveform distortion, and the transient...

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Abstract

The invention provides a distribution network fault early warning method and system based on transient waveforms. The method is characterized in that a sample library is established in advance, the sample library stores transient waveforms of historical faults, a first current transient waveform corresponding to a current disturbance event of a distribution network line is compared with data of the sample library, and an early warning message is generated according to a comparison result. The distribution network fault early warning method based on the transient waveforms fully utilizes historical fault data and historical transient waveforms which are accumulated by various state monitoring systems including electric energy quality systems and transient waveform recording systems, and matches the transient waveform of the current disturbance event with the historical transient waveforms, so that early warning can be achieved for non-accidental faults of a distribution network, and the feasibility is strong.

Description

technical field [0001] The invention relates to the application field of power grids, in particular to a distribution network fault early warning method based on transient waveforms. Background technique [0002] Electric power is the foundation of the national economy and is crucial to the development of a country. Therefore, ensuring the safe and effective operation of the power system has become a top priority. The modern distribution network has the characteristics of complex topological relationship, large number of nodes, and dense density. During actual operation, failures will inevitably occur due to external force damage, extreme weather, and equipment aging. At present, various technologies are used in the power system to reduce the time for repairing faults, but the research on fault early warning is rarely involved. [0003] Some existing methods for early warning of faults are realized by monitoring the load status of distribution lines. However, after five ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 李新邢立坤罗容波吴沃生曾庆辉李国伟
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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