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Signal-to-noise separation method for partial discharge signal, information data processing terminal

A discharge signal and signal-to-noise separation technology, applied in spectrum analysis, measuring electrical variables, testing dielectric strength, etc., can solve the problems of large amount of calculation, unclear pulse edge, and large consumption of manpower and material resources, etc., to achieve efficient and accurate extraction , The effect of reducing the amount of calculation and improving efficiency

Active Publication Date: 2021-06-11
XIDIAN UNIV
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  • Claims
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Problems solved by technology

[0006] (1) Current research methods for partial discharge signals of high-voltage electrical equipment When detecting partial discharge signals online, it is difficult to determine the start and end edges of a single pulse signal due to the influence of background noise
The existing technology has problems such as large amount of calculation and unclear pulse edge, which brings many difficulties to the subsequent signal separation
[0007] (2) The supervisory identification algorithm requires certain prior knowledge, so before performing noise and partial discharge identification on the collected signal, a large number of partial discharge tests need to be carried out to establish a discharge characteristic database, which will consume a lot of manpower and material resources; On the one hand, due to the complexity of the field environment, the pulse signal obtained at a certain time of the same typical PD is often different from the signal obtained at another time, and the PD database cannot cover pulse signals at all times, so when identifying Misjudgments are prone to occur in the process
Wrong construction of feature parameters will directly lead to unsatisfactory clustering effect

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  • Signal-to-noise separation method for partial discharge signal, information data processing terminal

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Embodiment Construction

[0061] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0062] Aiming at the current research methods of partial discharge signals of high-voltage electrical equipment, a large number of partial discharge tests are required, which consumes manpower and material resources; the pulse signal extraction has a large amount of calculation, and the pulse edge is not clear; the wrong structure of the characteristic parameters will directly lead to the ineffective clustering effect. Ideal problem, the present invention uses amplitude-time threshold method and time-domain energy method to jointly extract pulse signals, which can efficiently and accurately extract each pulse waveform; uses ...

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Abstract

The invention belongs to the technical field of partial discharge detection of high-voltage electrical equipment, and discloses a signal-to-noise separation method for partial discharge signals and an information data processing terminal; collects partial discharge waveform signals; extracts partial discharge signals to obtain a single pulse signal, Record the peak value and phase of the pulse, and draw the phase distribution spectrogram; pass the extracted pulse through multiple band-pass filters to obtain the peak value information of the pulse under the corresponding filter, and obtain the characteristic parameters through principal component analysis and dimensionality reduction; The parameters are clustered and analyzed, the pulses are divided into multiple categories, and a single-type pulse phase distribution spectrum is drawn according to the classification category number, pulse peak value, and pulse phase to determine the partial discharge signal and the interference signal. The invention can efficiently and accurately extract each pulse waveform; using the peak information under a plurality of band-pass filters as a feature vector can fully reflect the pulse waveform information and improve the separation accuracy of interference signals and partial discharge signals.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection of high-voltage electrical equipment, and in particular relates to a signal-to-noise separation method for partial discharge signals and an information data processing terminal. Background technique [0002] At present, the closest existing technology: With the acceleration of the pace of social modernization, the scale of my country's power grid continues to expand, and power cables are also widely used in power transmission systems at all levels. The variation and characteristics of partial discharges are somewhat indicative of defects in the cable and can reflect early deterioration of the cable insulation. At the same time, in the process of stator insulation deterioration of large generators in high-voltage electrical equipment, partial discharge activity is an important indicator for judging the degree of deterioration, and partial discharge can be used as a precursor to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R23/165G01R23/12G06K9/00G06K9/62
Inventor 米建伟梁园园刘倩李素兰仲彦林封春曼
Owner XIDIAN UNIV
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