GIS partial discharge mode identification method under oscillation mode impulse voltage

An impulse voltage and pattern recognition technology, applied in the direction of testing dielectric strength, etc., can solve the problems of lack of power frequency voltage continuity of impulse voltage, no effective identification method for partial discharge pattern recognition, etc., and achieve the effect of accurate recognition.

Active Publication Date: 2015-02-25
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0005] However, because the impulse voltage lacks the continuity of the power frequency voltage, there is no effective identification method for PD pattern recognition under the impulse voltage

Method used

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  • GIS partial discharge mode identification method under oscillation mode impulse voltage
  • GIS partial discharge mode identification method under oscillation mode impulse voltage
  • GIS partial discharge mode identification method under oscillation mode impulse voltage

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0027] Such as figure 1 and figure 2 As shown, a GIS partial discharge pattern recognition method under oscillating impulse voltage includes the following steps:

[0028] Step 1: Conduct on-site oscillating impulse withstand voltage test on GIS, and use pulse current method to detect GIS partial discharge under oscillating impulse voltage;

[0029] Step 2: Take as figure 1 The oscillating impulse voltage signal is used as the excitation voltage signal to obtain the corresponding partial discharge signal under the oscillating impulse voltage;

[0030] Step 3: Process the oscillatory impulse voltage and the partial discharge signal, and extract the median value of the discharge phase Ф1 to Ф4 in each of the first four oscillation cycles according to the oscillation cycle to form four phase feature quantities;

[0031] Step 4: Process the oscillating impul...

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Abstract

The invention discloses a GIS partial discharge mode identification method under oscillation mode impulse voltage. The method includes the steps that firstly, a field oscillation mode impulse withstand voltage test is conducted on a GIS, an impulse current method is used for conducting GIS partial discharge detection under the oscillation mode impulse voltage, and partial discharge electric signals under the oscillation mode impulse voltage are obtained; secondly, the oscillation property of the oscillation impulse voltage and the discharge property of four previous oscillation periods are used for conducting characteristic extracting, and eight characteristic parameters, namely four phase characteristic quantities and four discharge rate characteristic quantities, are extracted; finally, a neural network is used for conducting a discharge type mode identification and outputting an identification result. According to the GIS partial discharge mode identification method under the oscillation mode impulse voltage, the oscillation property of the oscillation mode impulse voltage is fully utilized, the difficulty that at present, discharge type mode identification cannot be conducted in partial discharge detection under the oscillation impulse voltage is overcome, and identification is accurate, fast and effective.

Description

technical field [0001] The invention relates to a partial discharge pattern recognition method, in particular to a GIS partial discharge pattern recognition method under oscillating impulse voltage. Background technique [0002] Oscillating impulse voltage is a type of impulse voltage suitable for on-site operation. Compared with standard impulse voltage, it has the characteristics of high generation efficiency and adaptability to on-site operation. [0003] At present, the on-site impulse withstand voltage test of GIS with oscillating impulse voltage has been gradually carried out in China, and the detection of partial discharge while performing the impulse withstand voltage is of great significance for improving the sensitivity of fault diagnosis. [0004] However, partial discharge under impulse voltage is different from partial discharge under power frequency voltage. Compared with power frequency voltage, it has the characteristics of shorter duration of excitation volt...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 杨景刚贾勇勇陶加贵赵科高山周志成薄斌
Owner STATE GRID CORP OF CHINA
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