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Distribution line early fault severity evaluation method based on waveform characteristics

A technology for early faults and power distribution lines, applied in the field of power transmission, can solve problems such as lack of convincingness, achieve the effect of avoiding permanent faults and improving the reliability of power supply

Active Publication Date: 2020-09-29
SICHUAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are few relevant studies on the quantitative evaluation of the early fault severity of distribution lines, and the relevant research only starts from the perspective of analyzing the measured waveform through signal processing methods, and lacks the mechanism analysis of the early fault development and evolution process, which makes some of the proposed indicators Unconvincing

Method used

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  • Distribution line early fault severity evaluation method based on waveform characteristics
  • Distribution line early fault severity evaluation method based on waveform characteristics
  • Distribution line early fault severity evaluation method based on waveform characteristics

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Embodiment

[0035] At present, there are few relevant studies on the quantitative evaluation of the severity of early faults in distribution lines. The present invention is based on the arc mathematical model and the waveform data measured at the substation end, and analyzes the changing law of the waveform characteristics with the continuous development of early faults. Based on the quantitative evaluation of the severity of early faults, the function of predicting and early warning of distribution network lines is realized, so as to guide the maintenance of distribution lines, avoid permanent faults, and improve power supply reliability.

[0036] Such as figure 1 As shown, the present invention provides a method for evaluating the severity of early faults in distribution lines based on waveform characteristics, and its implementation method is as follows:

[0037] S1. Monitor the early fault of the kth distribution line, and obtain the original voltage waveform of the distribution line;...

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Abstract

The invention provides a distribution line early fault severity evaluation method based on waveform characteristics, and the method comprises the steps: monitoring an early fault of a kth distributionline, and obtaining an original voltage waveform of the distribution line; according to the original voltage waveform of the distribution line, respectively calculating to obtain a voltage determination coefficient and a voltage approximate entropy; calculating to obtain a comprehensive evaluation index of the early fault degree of the distribution line according to the voltage determination coefficient and the voltage approximate entropy; and determining the severity of the kth early fault according to the interval range to which the comprehensive evaluation index of the early fault degree of the distribution line belongs. Through the design, the function of predicting and early warning the distribution network line is realized, so that the overhaul and maintenance of the distribution line is guided, permanent faults are avoided, and the power supply reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission, in particular to a method for evaluating the severity of early faults of distribution lines based on waveform characteristics. Background technique [0002] Early fault refers to an intermittent and transient fault that occurs before the permanent fault of the equipment, and has the characteristics of short duration. In this fault disturbance mode, the relay protection device will not be activated. This type of fault will occur within a period of time. Repeatedly occur within time, and eventually lead to permanent failure; waveform characteristics refer to the analysis and extraction of disturbance characteristics from multiple angles such as time domain, frequency domain or time-frequency domain according to the recorded disturbance waveform; severity refers to the characteristics of early fault waveforms The output state can reflect the degree of insulation deterioration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R29/04G06F17/15
CPCG01R29/04G01R31/08G01R31/088G06F17/15
Inventor 张文海瞿科肖先勇张姝楚恬歆
Owner SICHUAN UNIV
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