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Cable partial discharging positioning method based on self-correlation-wavelet modulus maximum analysis

A technology of partial discharge and positioning method, applied in the field of power system, can solve the problems of accurate positioning, inability to achieve, and good positioning effect of interference partial discharge

Active Publication Date: 2015-06-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the partial discharge signal generally contains noise with large energy, and the wavelet modulus maximum value of the noise signal will seriously interfere with the accurate positioning of partial discharge.
[0005] Therefore, neither the correlation method nor the wavelet transform modulus maximum method can achieve a good positioning effect.

Method used

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  • Cable partial discharging positioning method based on self-correlation-wavelet modulus maximum analysis
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  • Cable partial discharging positioning method based on self-correlation-wavelet modulus maximum analysis

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Embodiment Construction

[0059] Attached below Figure 1~6 The specific embodiment of the present invention is described in further detail with specific examples.

[0060] figure 1 The schematic diagram of the partial discharge test of the power cable is marked. The test scheme adopts the method of single-ended partial discharge location, that is, a partial discharge detection device is connected to one side of the test cable, and the time difference between the incident wave and the reflected wave of the partial discharge signal is used to detect the partial discharge. Click to locate. The partial discharge detection unit includes a partial discharge coupling unit (detection impedance or high-frequency current sensor can be used), a signal filter, a signal amplifier and a data acquisition device.

[0061] figure 2 It is a schematic diagram of the principle of time domain reflectometry. The two ends of the test cable are respectively set as A terminal and B terminal, and the length is set as Th...

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Abstract

The invention discloses a cable partial discharging positioning method based on self-correlation-wavelet modulus maximum analysis, and belongs to the field of the electric system. The method comprises the following steps that firstly, collecting and primary processing is carried out on a partial discharging signal; secondly, a partial discharging incident wave-reflected wave pulse data segment is extracted; thirdly, self-correlation processing is carried out on the incident wave-reflected wave pulse data segment x(n) in the second step, and an estimated value dN of a wavefront time difference of an incident wave and a reflected wave is extracted; fourthly, N-layer wavelet decomposition and reconstitution are carried out on the incident wave-reflected wave pulse data segment x(n) in the third step, a maximum point of each layer wavelet reconstitution signal is extracted as a the wavefront position of the incident wave, and the estimated value dN, obtained by the self-correlation analysis in the third step, of the wavefront time difference of the incident wave and the reflected wave is regarded as the reference, the maximum value moment of the reflected wave wavelet modulus is extracted, the wavefront time difference of the incident wave and the reflected wave is calculated, and the partial discharging position is calculated. The method has the advantages that the positioning accuracy is high, and the anti-interference capacity is high.

Description

technical field [0001] The invention belongs to the field of power systems, relates to power system signal processing application technology, in particular to a cable partial discharge location method based on autocorrelation-wavelet modulus maximum analysis. Background technique [0002] Power cables have been widely used in urban distribution networks, but the power operation department urgently needs to know the insulation status of power cables to ensure the safety and reliability of power supply. Partial discharge is a harbinger of insulation failure in power cables. Therefore, effective detection of partial discharge and accurate positioning of discharge points are an important way to improve the safe operation of cables. [0003] Time Domain Reflectometry (also known as TDR) is a measurement technology developed in the past ten years and is widely used in line length measurement and fault location. After the partial discharge signal is generated in the cable, one pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/11
Inventor 高树国范辉潘瑾陈志勇刘贺晨刘云鹏刘宏亮陈二松
Owner STATE GRID CORP OF CHINA
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