A method for extracting moa resistive current

A technology of resistive current and extraction method, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem that there is no method for accurately extracting MOA resistive current, and achieve the effect of solving the difficulty of accurate measurement and eliminating white noise

Active Publication Date: 2022-06-03
STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is currently no method that can accurately extract the MOA resistive current

Method used

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  • A method for extracting moa resistive current
  • A method for extracting moa resistive current
  • A method for extracting moa resistive current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The data of MOA resistive current of a 110KV substation within one year is collected. The sampling frequency is 1200Hz, the number of sampling points is 8458, and the sampling interval is 1 hour. The resistive current data is as follows: figure 2 shown in (a). The fundamental frequency f of the resistive current is 50Hz, and the optimal number of decomposition layers of the wavelet packet transform calculated by formula (2) should satisfy 3.585≤l≤4.585, so the number of decomposition layers l should be 4 layers, and the number of decomposed sub-signals is 2 4 =16, according to formula (1), the frequency length of each sub-signal Δf=37.5HZ, can completely separate the resistive current signal of 50Hz interval. The denoising results of this method are as follows: figure 2 shown in (b). The picture shows that the arrester is aging, and regular maintenance and cleaning need to be strengthened to prevent further aging of the MOA.

Embodiment 2

[0045] The data of the resistive current of MOA within one year of a 220KV substation is collected. The sampling frequency is 1200Hz, the number of sampling points is 8458, and the sampling interval is one hour. For example, image 3 shown in (a). The sampling frequency and the current fundamental frequency are the same as above, so it is directly decomposed into 4 layers. The denoising results of this method are as follows: image 3 shown in (b). The graph shows that the MOA performs well.

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Abstract

The invention relates to a method for extracting MOA resistive current, comprising the steps of: determining the optimal decomposition layer number and optimal wavelet base of wavelet packet transform by analyzing the characteristics of the signal to be measured; adopting EMD decomposition for the collected MOA resistive current signal , and select the modal component with characteristic frequency according to the spectrogram, perform WPT operation on the selected modal component, and use SVD to extract the characteristic frequency in each sub-signal; reconstruct the extracted characteristic frequency signal to get Resistive current signal after interference removal. The invention can more accurately extract the resistive current of the MOA.

Description

technical field [0001] The invention relates to the technical field of power system MOA design, in particular to a MOA resistive current extraction method. Background technique [0002] The protection capability of MOA, or whether it operates normally, mainly depends on the performance of the metal oxide valve, and the performance of the valve can be reflected to a certain extent by the leakage current, especially the resistive current. The peak value of the resistive current is determined by including Odd harmonics, including the fundamental wave, are superimposed. [0003] The measured data of resistive current is a weak signal, which is easily affected by electromagnetic interference, lightning strike interference and environmental factors such as interferons. In addition, the internal space of the metal oxide arrester is small, which affects the dissipation of heat generated by active power, resulting in the resistance current monitoring data of the arrester. There is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16G01R31/00
CPCG01R23/16G01R31/00Y02E60/00
Inventor 陈敏维阮莹叶行汶王星舒勤徐方维邓明锋刘慧鑫连鸿松傅智为刘旭肖荣洋
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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