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Weak impulse signal extraction and separation method based on power frequency sampling

A signal extraction and separation method technology, which is applied to measuring devices, instruments, and fault detection according to conductor types, can solve problems such as false alarms, and achieve the effects of accurate judgment, high stability, and wide coverage

Active Publication Date: 2018-09-04
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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Problems solved by technology

The energy of the traveling wave signal is much smaller than the energy of the power frequency signal. Only when the amplitude threshold is as low as possible can the traveling wave signal be responded to. When the amplitude threshold is low, when the interference signal is relatively large, false alarms are prone to occur.

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  • Weak impulse signal extraction and separation method based on power frequency sampling
  • Weak impulse signal extraction and separation method based on power frequency sampling
  • Weak impulse signal extraction and separation method based on power frequency sampling

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Embodiment Construction

[0030] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] combine figure 1 The flow chart illustrates the specific implementation. In this example, the line voltage signal is sampled, and the current signal processing is similar to it. Weak shock signals use V P =500, period=15ms step signal, power frequency signal adopts V P = 20000 voltage signal; the sampling frequency of the high-speed A / D module is 1MHz, the number of sampling bits is 16Bit, and the sampling value is recorded as u b ;The low-frequency oversampling frequency is 10KHz, the number of sampling bits is 23 bits, and the sampling value is recorded as U a ;

[0032] The extraction and separation of weak impact signal...

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Abstract

The invention provides a weak impulse signal extraction and separation method based on power frequency sampling. The method comprises the steps that line signals are acquired through a high speed sampling module; the sampled signals are processed through an oversampling algorithm; the signal sampling frequency and accuracy are changed, and the transient signals of the oversampled signals are obtained through separation by starting the filter; peak integrator processing is performed, and the modulus maximum of the transient signals is acquired; and the signal change situation is compared, the algorithm is started to perform judgment according to the signal change and corresponding response is given. The transient signals can be effectively extracted, the dynamic range of starting can be extended by the oversampling algorithm and the dynamic range of the transient signals is enabled to exceed 60dB. The equipment has high response sensitivity for the transient signals and can respond to the transient signals of 0.1% of power frequency signal amplitude. The equipment has high operation stability and high anti-interference capacity.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to power fault ranging equipment, and in particular to a method for extracting and separating weak impact signals based on power frequency sampling. Background technique [0002] There are two main methods of fault location in power systems: fault analysis method and traveling wave location. In recent years, the traveling wave method is more popular. The traveling wave method is a new method to measure the distance according to the propagation time of the high-frequency transient traveling wave signal generated during the fault. In practice, the length of the traveling wave propagation line and the size of the transition resistance will affect the shape and amplitude of the traveling wave head. For traveling wave ranging, the more seriously the traveling wave head is affected, the more difficult it is to identify the traveling wave head, especially noise interference In sev...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 张怿宁孟令军齐曙光王越杨袁传杰
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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