A Method of Quickly Identifying CVT Faults Based on Wavelet Multiscale Transformation

A multi-scale, fault-based technology, applied in the measurement of electrical variables, character and pattern recognition, instruments, etc., can solve problems such as threats to the safe operation of the power grid, high CVT failure rates, and the complexity of supervision and investigation work, so as to improve fault identification and positioning capabilities, and the effect of quickly identifying fault waveforms

Inactive Publication Date: 2021-01-12
SICHUAN UNIV
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  • Claims
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Problems solved by technology

However, due to factors such as the strictly sealed CVT manufacturing process, in the actual operation process, in addition to oil leakage, abnormal noise and other easy-to-find faults, internal faults such as capacitor breakdown, secondary terminal looseness and other operational defects Occurs and is not easy to find, resulting in a high CVT failure rate during the input or exit process of line switching, compensation devices, etc., and causes the complexity of supervision and investigation work, threatening the safe operation of the power grid

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  • A Method of Quickly Identifying CVT Faults Based on Wavelet Multiscale Transformation
  • A Method of Quickly Identifying CVT Faults Based on Wavelet Multiscale Transformation
  • A Method of Quickly Identifying CVT Faults Based on Wavelet Multiscale Transformation

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Embodiment Construction

[0044] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0045] A capacitive voltage transformer is an electrical device with a unique structure composed of a capacitive voltage divider and an electromagnetic unit (intermediate transformer). figure 2 It is a simplified diagram of the CVT electrical structure, and the capacitor voltage divider divides the high-voltage capacitor C 1 and medium voltage capacitor C 2 Two parts, where the high voltage capacitor C 1 by C 11 、C 12 ...

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Abstract

The invention discloses a method for quickly identifying CVT faults based on wavelet multi-scale transformation, which includes: collecting voltage signals of each CVT device in an online power system; , the voltage signal is decomposed by wavelet multi-scale transform to obtain scale coefficients and wavelet coefficients; the threshold value selection method is used to adjust the threshold value of wavelet coefficients, and the wavelet coefficients at all levels after threshold adjustment are reconstructed according to the inversion algorithm of wavelet transform, Obtain the denoising signal; according to the selected wavelet base, use the wavelet multi-scale transform to decompose the denoising signal; select three scales, and use the modulus maximum method to process the single-scale reconstructed signal; according to the reconstructed three voltage The waveform of the signal can locate the fault occurrence point.

Description

technical field [0001] The invention relates to the field of fault identification and power system measurement devices, in particular to a method for quickly identifying CVT faults based on wavelet multi-scale transformation. Background technique [0002] In recent years, with the continuous development of my country's modern power grid, it has shown the characteristics and trends of intelligence and ultra-high voltage. The development situation of continuously deepening intelligence. [0003] Capacitor Voltage Transformer (CVT) is widely used in high-voltage monitoring work because of its simple structure, economical safety, easy maintenance, and high insulation reliability. However, due to factors such as the strictly sealed CVT manufacturing process, in the actual operation process, in addition to oil leakage, abnormal noise and other easy-to-find faults, internal faults such as capacitor breakdown, secondary terminal looseness and other operational defects Occurs and is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02G06K9/00
CPCG01R35/02G06F2218/06
Inventor 韦家富刘友波刘向龙强文渊
Owner SICHUAN UNIV
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