Noise removing method for contact net insulator leaked currents

A leakage current and insulator technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems such as poor denoising effect, achieve the effect of reducing influence and signal distortion

Inactive Publication Date: 2014-02-05
LANZHOU JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can not only solve the problem of poor denoising effect that may be caused by the existence of EMD, but also retain useful signals to the greatest extent.

Method used

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  • Noise removing method for contact net insulator leaked currents
  • Noise removing method for contact net insulator leaked currents
  • Noise removing method for contact net insulator leaked currents

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Embodiment Construction

[0037] Hereinafter, the invention will now be described more fully with reference to the accompanying drawings, in which various embodiments are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0038] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0039] The method can be divided into a step of improving the EMD method and a step of implementing leakage current denoising based on the improved EMD threshold.

[0040] Technical implementation plan:

[0041] 1EMD method improvement

[0042] The specific process of EMD decomposition signal is as follows:

[0043] (1) Identify all local maxima and local minima in the or...

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PUM

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Abstract

The invention relates to a noise removing method for contact net insulator leaked currents. According to the method, an extreme value prolongation method is used for reducing end point effect, signals are resolved through an improved EMD method so as to obtain components of frequency from high to low, a power ratio method is used to remove false components, noise in high-frequency ingredients in the remaining components is removed in a small wave threshold mode, and high frequency signals after noise removing and the remaining components are reconstructed, so that signals after noise removing can be obtained. The EMD method has adaptivity compared with small wave conversion. The problem of base function selection does not need considering. Compared with the EMD method, the improved EMD threshold method reduces effect of end point effect and false components on noise removing effect. Further, threshold value noise removing is conducted on high-frequency components, useful signals can be maintained to a largest degree, and signal distortion is reduced.

Description

technical field [0001] The invention relates to a method for denoising leakage current of catenary insulators. Background technique [0002] With the implementation of my country's "Medium and Long-Term Railway Network Planning", the mileage of western railways is increasing. The catenary is a special form of power supply line for electrified railways. It is the key to good current collection and safe operation of electric locomotives. Due to its low installation height and no backup, it is a weak link in electrified railways. Catenary faults account for a large proportion, which affects railway production and personnel safety. [0003] In the process of pollution flashover warning for catenary insulators, leakage current is a key parameter. Leakage current is the final result of the three elements of voltage, climate, and pollution degree. By monitoring the leakage current and climate parameters, reliable early warning can be given to insulator pollution flashover to redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 张友鹏周郁马军党王思华徐金阳董海燕赵珊鹏赵琼
Owner LANZHOU JIAOTONG UNIV
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