Transformer DC magnetic bias judgment method based on wavelet energy spectrum characteristics of vibration signals

A technology of vibration signal and DC magnetic bias, applied in instruments, measuring electrical variables, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of lack of persuasion, large amount of training, and easy to be interfered by other factors, and achieve the realization process Simple and effective, low data preprocessing requirements, and low on-site data volume requirements

A technology of vibration signal and DC magnetic bias, applied in instruments, measuring electrical variables, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of lack of persuasion, large amount of training, and easy to be interfered by other factors, and achieve the realization process Simple and effective, low data preprocessing requirements, and low on-site data volume requirements

CN111735533AActive
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  • Transformer DC magnetic bias judgment method based on wavelet energy spectrum characteristics of vibration signals
  • Transformer DC magnetic bias judgment method based on wavelet energy spectrum characteristics of vibration signals

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. A transformer DC bias judgment method based on vibration signal wavelet energy spectrum features, the specific implementation steps are as follows:

[0035] Step A: Acquisition and processing of transformer vibration signals

[0036] Step A1: Use the vibration sensor installed on the side of the transformer box to collect the vibration signal of the transformer at a sampling frequency of 4000 Hz, where the vibration sensor adopts the vibration sensor of the acceleration category;

[0037] Step A2: The previous 99 sampling points and the current downsampling point k 0 The acceleration value a(k 0 -99), a(k 0 -98), a(k 0 -97), ..., a(k 0 -2), a(k 0 -1), a(k 0 ) constitute the transformer vibration signal sequence A(k 0 ), A(k 0 )=[a(k 0 -99), a(k 0 -98), a(k 0 -97), ..., a(k 0 -2), a(k 0 -1), a(k 0 )];

[0038] Step A3: Use the cent...

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Abstract

The invention discloses a transformer DC magnetic bias judgment method based on wavelet energy spectrum characteristics of a vibration signal. The method comprises the following steps: A, acquiring the vibration signal of a transformer and processing the acquired signal; B, judging the DC magnetic bias of the transformer according to the energy spectrum characteristics of the vibration signal frequency component energy distribution sequence; within the time T, if the wavelet energy spectrum characteristic C is always greater than the judgment threshold D, judging that DC magnetic bias occurs;otherwise, turning to the step 1. According to the invention, the technical problems that in the prior art, transformer DC magnetic bias judgment is high in requirement for effectiveness and accuracyof data, large in training amount, lack of theoretical basis, lack of evaluation on the DC magnetic bias state, prone to being disturbed by other factors, lack of persuasion, low in accuracy and reliability and the like are solved.

Description

technical field [0001] The invention relates to the technical field of signal detection and processing, in particular to a transformer DC bias judgment method based on vibration signal wavelet energy spectrum features. Background technique [0002] Due to factors such as track stray current, asymmetrical grounding method of DC transmission and geomagnetic storm, the neutral point of the transformer produces DC magnetic flux, which makes the transformer work in an abnormal state, which is called the DC bias phenomenon of the transformer. After the DC bias occurs in the transformer, problems such as local overheating and aggravated vibration and noise will occur, which will damage the operating life of the transformer, and will cause the relay protection device to malfunction, endangering the safe and stable operation of the power supply system. Therefore, it is necessary to judge the DC bias state of the transformer to provide a theoretical basis for the formulation of the DC...

Claims

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Application Information

IPC
G01H17/00; G01R31/00; G06F17/15
CPC
G01H17/00; G01R31/00; G06F17/15
Inventors
刘君; 牛唯