Method for extracting characteristic quantity of vibration signal of transformer

A vibration signal and extraction method technology, which is applied to instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as signal denoising that are rarely considered, achieve high frequency doubling resolution, improve reliability and use The effect of reducing the interference of low-frequency vibration signals

Inactive Publication Date: 2019-02-22
国网山西省电力公司阳泉供电公司 +1
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Problems solved by technology

The time spectrum is mainly to monitor the sudden change of the signal on the time axis. The change of the transformer state is mostly the process of long-term accumulation of abnormal components. During this process, the signal is still an irregular periodic signal, and the frequency distribution of the vibration signal does not change with time. Time-spectrum analysis still has some limitations
In addition, the existing transformer vibration feature extraction technology seldom considers the denoising of the signal

Method used

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  • Method for extracting characteristic quantity of vibration signal of transformer
  • Method for extracting characteristic quantity of vibration signal of transformer
  • Method for extracting characteristic quantity of vibration signal of transformer

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Embodiment example

[0039] Using PCB356A16 piezoelectric acceleration sensor and NI9234 data acquisition instrument to test the vibration signal of a transformer prototype model S11-M-10 / 10, the sampling frequency is 25.6kHz. Extract the characteristic quantity of the no-load vibration signal of the test transformer. At no-load, the secondary winding has no current, and the primary winding current is very small. At this time, the main vibration is the iron core. The measuring point located in the middle of the front can obtain the vibration information of the high and low pressure side by the shortest path, and is the best monitoring point. Figure 2a -b is the original waveform and frequency spectrum of the vibration signal at this point.

[0040] Figure 2a Among them, the waveform distortion of the core vibration signal is serious, which is due to the superposition of interference signals in the environment and the nonlinearity of the core material, resulting in low frequency components and m...

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Abstract

The invention discloses a method for extracting the characteristic quantity of a vibration signal of a transformer. According to the method, filter parameters are calculated based on a fast spectral kurtosis diagram method and a filter is designed to filter an original vibration signal; on the basis of an improved empirical mode decomposition method, the signal is decomposed to obtain a series ofintrinsic mode functions, correlation coefficients between all intrinsic mode function components and the original signal are calculated according to a correlation coefficient method, and a sensitiveintrinsic mode function is extracted and is reconstructed; and then the reconstructed transformer vibration signal characteristic frequency, kurtosis, amplitude and mean are extracted to form a vibration signal characteristic vector and the vibration signal characteristic vector is compared with the normal characteristic vector to determine the state of the transformer.

Description

technical field [0001] The invention relates to the field of transformer fault detection, in particular to a method for extracting characteristic quantities of transformer vibration signals based on a fast spectral kurtosis map method and an improved set empirical mode decomposition and correlation coefficient method. Background technique [0002] The research on diagnostic technology based on transformer vibration signals is mainly divided into two directions: simulation modeling and experimental research, and signal processing. In terms of signal processing, Fourier transform is the basis of signal frequency domain analysis, which reflects the distribution of the global frequency of the signal. Some researchers have proposed that the ratio of the fundamental frequency of the transformer vibration signal and the ratio of high-order harmonics should be used as the basis for transformer state diagnosis. Feature amount. With the further development of signal processing techno...

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Application Information

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IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 武立平李晟张勇徐舒蓉赵莉华黄小龙
Owner 国网山西省电力公司阳泉供电公司
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