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Lightning arrester residual voltage characteristic monitoring method based on wavelet transform

A technology of wavelet transform and lightning arrester, which is applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve the problems of delayed maintenance and replacement of faulty equipment timing, easy to cause major accidents, etc., and achieve the effect of reducing major accidents

Pending Publication Date: 2020-11-17
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for monitoring the residual voltage characteristics of arresters based on wavelet transform, which solves the problem that it is difficult to quickly diagnose potential faults in zinc oxide arresters in the prior art, and delays the timing of maintenance and replacement of faulty equipment, which is likely to lead to serious problems. accident problem

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  • Lightning arrester residual voltage characteristic monitoring method based on wavelet transform
  • Lightning arrester residual voltage characteristic monitoring method based on wavelet transform
  • Lightning arrester residual voltage characteristic monitoring method based on wavelet transform

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] refer to figure 1 The monitoring method of the present invention is based on a monitoring device. The structure of the monitoring device is to include an electric field sensor 2 and a current sensor 3. The electric field sensor 2 is arranged on one side of the zinc oxide arrester 1, and the electric field sensor 2 includes a capacitor C1 and a capacitor C2 connected in series. , the capacitor C1 and the capacitor C2 are connected in series and grounded, and the node between the capacitor C1 and the capacitor C2 is connected to the signal processing unit 4; the current sensor 3 is set on the low-voltage side of the zinc oxide arrester 1, and the output terminal of the current sensor 3 is also connected to the signal processing unit The unit 4 and the signal processing unit 4 are connected with the monitoring terminal 5 to realize online...

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Abstract

The invention discloses a lightning arrester residual voltage characteristic monitoring method based on wavelet transform. The method comprises the following steps: step 1, respectively acquiring current and voltage parameters of a zinc oxide lightning arrester during lightning overvoltage impact; step 2, processing the current and voltage parameters, performing data denoising and calculation by using wavelet transform, decomposing the acquired current and voltage parameters interfered by various factors on site in a time domain and a frequency domain by using wavelet transform, and separatingeffective signals from original signals containing noise, thus obtaining a residual voltage characteristic curve when the zinc oxide arrester is impacted by electric overvoltage; and 3, analyzing theobtained residual voltage characteristic curve, finding out the internal relation between the residual voltage characteristic change and the working condition of the zinc oxide lightning arrester, and determining the working condition of the zinc oxide lightning arrester. According to the method, the residual voltage characteristics of the zinc oxide arrester during lightning overvoltage can be rapidly and accurately monitored, and major accidents are reduced.

Description

technical field [0001] The invention belongs to the technical field of lightning arrester fault monitoring, and relates to a method for monitoring residual voltage characteristics of lightning arresters based on wavelet transform. Background technique [0002] With the full implementation of the smart grid plan of the State Grid Corporation of China, the weight and status of online monitoring technology in the secondary field of power systems has gradually increased, which is an important guarantee for the realization of power system automation. Therefore, it is necessary to conduct in-depth research and put into application online monitoring technology. appears to be particularly important. [0003] As early as the 1950s, countries around the world began to pay attention to the implementation of safety monitoring of electrical equipment, from traditional post-accident maintenance to regular monitoring and maintenance, and the regular monitoring and maintenance mechanism mak...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R19/00G06F17/14
CPCG01R23/16G01R19/0053G06F17/148
Inventor 朱永灿张鹏杨暑森熊浩男高梧
Owner XI'AN POLYTECHNIC UNIVERSITY
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