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A cable early fault detection method and device

An early fault and cable technology, applied in the field of power cables, can solve the problems of not being able to clearly give the start and end time of the fault, and it is difficult to accurately track early faults

Active Publication Date: 2017-01-25
ZHEJIANG TRULY ELECTRIC +5
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Problems solved by technology

The time-domain feature detection method mainly determines whether it is an early fault by detecting the amplitude changes of the cable voltage and current. This method can give the start and end time of each fault. However, the characteristics of early faults are mainly reflected in the high voltage and current signals. In terms of frequency components, it is difficult to accurately track early faults only from voltage and current amplitude changes
The frequency domain feature detection method mainly judges whether it is an early fault by detecting the harmonic components of voltage and current, but it cannot clearly give the start and end time of the fault occurrence

Method used

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  • A cable early fault detection method and device
  • A cable early fault detection method and device
  • A cable early fault detection method and device

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specific Embodiment

[0071] Step S201: Set a sampling frequency of 3.2kHz for the current signal, that is, 64 points are collected per cycle;

[0072] Step S202: Take 8 consecutive sampling points for each window, and record the serial number of the sampling point at the end of the window as i;

[0073] The present invention samples the current signal of the power cable, and the set frequency is 3.2kHz, that is, 64 points are collected per cycle. Refer to attached figure 2 , the sampling window scrolls to read the current sampling point i and the 7 consecutive points before the current sampling point i, and then perform discrete wavelet analysis.

[0074] Step S203: set i=1;

[0075] Step S204: The window time is recorded as t w , using the discrete wavelet transformation to perform three-layer Mallat decomposition on the 8 sampling points in the window to obtain the detail coefficients of each high-frequency band and the approximate coefficients of the low-frequency band;

[0076] Step S205:...

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Abstract

The invention provides a method and a device for detecting the early failure of a cable. The method comprises the steps of orderly performing wavelet analysis on a sampling window comprising a preset number of sampling points, and if the criterion of a first transient process and the criterion of a second transient process are satisfied after the wavelet analysis and the time interval of the two transient processes is within 1 / 4 cyclic wave and 5 cyclic waves, determining the early failure between the first transient process and the second transient process and considering the first occurrence moment of the first transient process as the starting time of the early failure and the second occurrence moment of the first transient process as the terminal time of the early failure. As a result, the method is capable of accurately identifying the early failure and giving the exact starting and terminal moments of the failure.

Description

technical field [0001] The invention relates to the field of power cables, in particular to a cable early fault detection method and device. Background technique [0002] With the continuous advancement of urbanization, the current urban distribution network tends to use power cables for power transmission. The fault development process of cables can be divided into early faults and permanent faults. Early failures are usually caused by progressive deterioration of the insulation due to internal aging. If early faults cannot be detected, identified and repaired in time, they will develop into permanent faults. [0003] At present, the early faults of power cables are mainly detected by the characteristics of time domain and frequency domain of voltage and current. The time-domain feature detection method mainly determines whether it is an early fault by detecting the amplitude changes of the cable voltage and current. This method can give the start and end time of each fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 刘理峰张静徐超李题印留毅姚海燕黄启震
Owner ZHEJIANG TRULY ELECTRIC
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