Pulse extraction method suitable for high frequency current partial discharge detection

A technology of partial discharge detection and partial discharge pulse, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of poor filter effect, large amount of calculation, poor self-adaptation, etc., and achieve omission of threshold optimization Iterative process, high real-time performance, and the effect of improving efficiency

Active Publication Date: 2017-05-31
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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Problems solved by technology

[0006] The invention provides a pulse extraction method suitable for high-frequency current partial discharge detection, which solves the problems of the existing pulse extraction method for high-frequency current partial discha

Method used

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  • Pulse extraction method suitable for high frequency current partial discharge detection
  • Pulse extraction method suitable for high frequency current partial discharge detection
  • Pulse extraction method suitable for high frequency current partial discharge detection

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Embodiment 1

[0057] In Example 1, please refer to figure 1 , providing a pulse extraction method suitable for high-frequency current partial discharge detection, the method comprising:

[0058] Step 1: First, perform wavelet decomposition on the digital signal sequence collected by AD;

[0059] Step 2: Calculate the characteristic quantity of the signal after wavelet decomposition, and obtain the peak value of the wavelet decomposition coefficient and the root mean square value corresponding to the peak value;

[0060] Step 3: Determine the signal type and shrink the wavelet decomposition coefficient according to the ratio of the peak value of the wavelet decomposition coefficient at each level to the effective value;

[0061] Step 4: Reconstruct the wavelet coefficients containing the partial discharge pulse signal;

[0062] Step 5: Based on the reconstructed signal, the pulse segment is extracted by automatic threshold calculation.

[0063] The object of the present invention processi...

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Abstract

The invention discloses a pulse extraction method suitable for high frequency current partial discharge detection. The method comprises the steps of (1) carrying out wavelet decomposition on a digital signal sequence collected through an AD, (2) carrying out characteristic quantity calculation on the signal which is subjected to the wavelet decomposition, and obtaining a peak value of a wavelet decomposition coefficient and a mean square root value corresponding to the peak value, (3) determining a signal type and carrying out wavelet decomposition coefficient shrinkage according to a ratio of the peak value of each level of wavelet decomposition coefficient to an effective value, (4) reconstructing the wavelet coefficient containing a partial discharge pulse signal, and (5) extracting a pulse burst through automatic threshold calculation based on a reconstructed signal. The technical effects of computational complexity reduction, filtering efficiency improvement and real-time high performance noise suppression are realized.

Description

technical field [0001] The invention relates to the technical field of partial discharge high-frequency current detection, in particular to a pulse extraction method suitable for high-frequency current partial discharge detection. Background technique [0002] Partial discharge detection is an important means to discover potential insulation defects of high-voltage electrical equipment, and it has the characteristics of high sensitivity, timely and effective. Among them, the high-frequency current partial discharge detection is connected to the grounding wire of the equipment through the Rogowski coil, which does not require any modification of the equipment or changes in the operation mode, which is convenient for installation and implementation. With the development of the detection frequency band to high frequency and broadband, the partial discharge signal information reflected by the high frequency current method is also more abundant, and then the ability of cluster an...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 贾志杰甘德刚王红梅唐志国王嘉易宁鑫唐铭泽邱凯陶亦然
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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