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A method for quickly identifying partial discharge patterns

A partial discharge and local technology, applied in the field of partial discharge pattern recognition, can solve the problems of complex detection methods, poor anti-interference ability, and insufficient sensitivity.

Active Publication Date: 2021-08-31
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

[0002] Power equipment will generate ultra-high-frequency electromagnetic wave signals during the partial discharge process. Different types of partial discharges generate different electromagnetic wave signals. The current detection of partial discharges mainly relies on the combination of ultrasonic waves and transient ground voltage. This method has insufficient sensitivity, The problem of poor anti-interference ability. Based on this principle, the method of pattern recognition mainly relies on professional equipment. The detection method is complex and time-consuming. It is generally used for maintenance after partial discharge failures, and cannot realize real-time capture and real-time analysis of partial discharges.

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  • A method for quickly identifying partial discharge patterns
  • A method for quickly identifying partial discharge patterns
  • A method for quickly identifying partial discharge patterns

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Embodiment Construction

[0059] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0060] as attached figure 1 As shown, the present invention provides a method for quickly identifying partial discharge patterns, and the specific implementation steps of the method are as follows:

[0061] Step 1, the digital signal of the partial discharge signal is normalized, and the digital signal sample S(x 1 ,x 2 ,x 3 …x n ),

[0062] (1) Partial discharge discharge energy characteristic value

[0063] The sampling rate of the system is known, and the sampling interval is set to t 0 , to calculate the partial discharge discharge energy eigenvalue:

[0064]

[0065] Among them, n represents the number of sample points in the partial discharge signal.

[0066] Calculate the maximum value of sample points:

[0067]

[0068] Normalized

[0069]

[0070] Get the normalized partial discharge signal S 1 =(x 1 ',x 2 ',x 3 ',...,x n '...

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Abstract

The invention discloses a method for quickly identifying partial discharge patterns, which belongs to the technical field of partial discharge pattern identification. This method first obtains the electromagnetic wave signal of partial discharge, numbers the sample points of the electromagnetic wave signal, and then performs normalization processing, and then extracts the sample points of the electromagnetic wave signal greater than the threshold according to the set threshold value to form a new electromagnetic wave signal sample , and extract the eigenvalue of the new sample, then conduct error analysis according to the eigenvalue, and obtain the reliability of the pattern analysis, and finally carry out the pattern recognition and judgment of the partial discharge signal according to the reliability of the pattern analysis. The invention can quickly realize the pattern recognition of the partial discharge signal by using the computer.

Description

technical field [0001] The invention belongs to the technical field of partial discharge pattern recognition, in particular to a method for analyzing partial discharge ultra-high frequency electromagnetic wave signals, which is used to realize partial discharge pattern recognition. Background technique [0002] Power equipment will generate ultra-high-frequency electromagnetic wave signals during the partial discharge process. Different types of partial discharges generate different electromagnetic wave signals. The current detection of partial discharges mainly relies on the combination of ultrasonic waves and transient ground voltage. This method has insufficient sensitivity, The problem of poor anti-interference ability. Based on this principle, the method of pattern recognition mainly relies on professional equipment. The detection method is complex and time-consuming. It is generally used for maintenance after partial discharge failures, and cannot realize real-time capt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G06K9/00
CPCG01R31/12G06F2218/08G06F2218/12
Inventor 王红军阎毓杰王楠吴雅君李耀华邢思玮
Owner NO 719 RES INST CHINA SHIPBUILDING IND