Method and system for extracting discharge current pulse
A discharge current and current technology, which is applied in the field of extracting discharge current pulses, can solve problems such as complex algorithms, low precision, and the inability to directly analyze discharge pulses, and achieve the effect of simple extraction methods and overcoming complexity
Active Publication Date: 2021-09-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology
If the surface discharge pulse occurs at the rising and falling edges of the square wave, the discharge pulse will overlap with the polarization current and depolarization current, so the discharge pulse cannot be directly analyzed
[0003] At present, conventional denoising algorithms such as FFT (Fast Fourier Transform, Fast Fourier Transform), but the accuracy is not high, the algorithm is complex
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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0046] The object of the present invention is to provide a method and system for extracting the discharge current pulse, so as to accurately extract the discharge current pulse when it coincides with the polarization current and the depolarization current.
[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accom...
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The invention relates to a method and system for extracting a discharge current pulse. The method comprises steps of obtaining creeping discharge currents at different sampling moments in a creeping discharge experiment, obtaining the sampling moment of a creeping discharge current peak value according to a light current peak value moment, setting the creepage discharge current corresponding to the creepage discharge current peak moment to be null to form a default creepage discharge current sequence, and performing cubic spline interpolation fitting on the default creepage discharge current sequence to obtain a fitted creepage discharge current sequence. The method is advantaged in that the fitting surface discharge current in the fitting surface discharge current sequence only comprises the polarization current and the depolarization current, so the current obtained by subtracting the fitting surface discharge current sequence from the surface discharge current sequence is the discharge current pulse, and accurate extraction of the discharge current pulse in the polarization current and the depolarization current is realized.
Description
technical field [0001] The invention relates to the field of discharge pulse extraction, in particular to a method and system for extracting discharge current pulses. Background technique [0002] In the creeping discharge test between insulating media under the action of positive polarity repetitive square waves, due to the rapid transformation of the voltage on the rising and falling edges of the square wave, the current waveforms at the rising and falling edges of the square wave show polarization current and de-polarization current respectively. Polarization current. If the creeping discharge pulse occurs at the rising and falling edges of the square wave, the discharge pulse will overlap with the polarization current and depolarization current, so the discharge pulse cannot be directly analyzed. [0003] At present, conventional denoising algorithms such as FFT (Fast Fourier Transform, Fast Fourier Transform), but the accuracy is not high, and the algorithm is complica...
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IPC IPC(8): G01R31/12
CPCG01R31/1236
Inventor 杨昊李学宝赵志斌崔新奇王浩洋徐治
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)