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TF spectrogram-based detection and identification method for cable partial discharge under X-ray excitation

A partial discharge detection and identification method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of cable X-ray radiation signal interference, inability to detect very small air gap defects in cables, etc., and achieve statistical time delay Short, large practical engineering application value, obvious effect

Pending Publication Date: 2021-12-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0003] In order to solve the problem that the existing power cable cannot detect the extremely small air gap defect of the cable well under the conventional pressure test and the X-ray excitation is used to interfere with the collected X-ray radiation signal when detecting the cable air gap defect, the present invention provides a method based on Detection and Identification Method of Cable Partial Discharge Under X-ray Excitation of TF Spectrum

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  • TF spectrogram-based detection and identification method for cable partial discharge under X-ray excitation
  • TF spectrogram-based detection and identification method for cable partial discharge under X-ray excitation
  • TF spectrogram-based detection and identification method for cable partial discharge under X-ray excitation

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Embodiment 1

[0022] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. This embodiment is the partial discharge detection and identification of cables under 1.5mm air gap defects, such as figure 1 Shown is a schematic flowchart of a method for detecting and identifying cable partial discharge under X-ray excitation based on a TF spectrum provided by an embodiment of the present invention, and the method includes:

[0023] Step 1): Directly apply X-ray irradiation to the cable model, collect the radiation signal of X-ray, carry out the equivalent time and equivalent frequency calculation of the collected signal to obtain the TF spectrogram of the X-ray signal;

[0024] In the step 1, the specific process is:

[0025] The 1.5mm air gap defect model is irradiated with X-rays, and the time-domain signal S(t) of X-rays is collected by a high-frequency current sensor. First, the time-domain signal is standardized, nam...

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Abstract

The invention discloses a TF spectrogram-based detection and identification method for cable partial discharge under X-ray excitation. The method comprises the steps of: applying X-ray irradiation to a cable model, collecting an irradiation signal of the X-ray, and carrying out equivalent time and equivalent frequency calculation on the collected signal, so as to obtain a TF spectrogram of the X-ray signal; pressurizing the cable model, finding an air gap discharge initial voltage under the ray irradiation, collecting a partial discharge signal and the irradiation signal of the X-ray, and performing equivalent time and equivalent frequency calculation on the collected signals to obtain a TF spectrogram; and finally, comparing the obtained TF spectrograms, eliminating an overlapping region of the two spectrograms, and taking the remaining region as the TF spectrogram of the partial discharge signal, so as to eliminate interference of the X-ray signal, and identify and detectthe partial discharge signal. With the method adopted, the detection effect on the extremely small air gap defect of the cable is obvious, and the interference of overlapped X-ray signals is eliminated during cable detection.

Description

technical field [0001] The invention relates to the technical field of high-voltage cable safety, in particular to a method for detecting and identifying cable partial discharges under X-ray excitation based on TF spectrograms, which is used for drawing TF spectrograms and original TF spectrograms obtained by pressurizing a cable model The X-ray signals of the overlapping TF spectra are excluded, and the non-overlapping X-rays are used to stimulate the detection and identification of the cable partial discharge. Background technique [0002] The power cable is responsible for the transmission of electric energy in the power system, but the insulation defect of the power cable has a great harm to the safe operation of the power system, especially the extremely small air gap defect that cannot be found under the conventional pressure test of the power cable, which has a great impact on the power supply. The safe operation of the system has great security risks. The current de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 王伟闫瑞舰薛忠沂段方维刘芮彤
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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