Self-adaptive partial-discharge monitoring method and device for sampling frequency

A technology of sampling frequency and monitoring device, applied in the field of intelligent substation, can solve the problems of poor sampling accuracy and data restoration degree, high signal restoration degree, and small sampling data volume, etc., so as to improve analysis accuracy, improve signal restoration degree, improve The effect of precision

Inactive Publication Date: 2012-12-26
XUCHANG UNIV
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Problems solved by technology

[0003] In the sampling processing of partial discharge signals, two methods are commonly used at present. One is the 2MHz high-frequency sampling method. Due to the high sampling rate, this method has a large amount of sampled data in a simple frequency cycle and a high degree of signal restoration. The value can accurately determine the sampling intensity and the type of discharge fault, but due to the large amount of data, the corresponding storage data capacity is limited, the number of signal c

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  • Self-adaptive partial-discharge monitoring method and device for sampling frequency

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] The PD monitoring device (PD signal sampling device) of the present invention includes a detection module: the detection module detects the UHF signal from the UHF probe; a judgment module: the judgment module judges whether the maximum amplitude of the detected discharge voltage is continuously greater than the set value Determined threshold, if not, then continue low-frequency sampling; If yes, then carry out high-frequency sampling; Low-frequency sampling module: low-frequency sampling module carries out described low-frequency sampling; High-frequency sampling module: high-frequency sampling module carries out described high-frequency sampling; saving module: the saving module saves the high-frequency sampling information of at least one power frequency cycle; and saves the low-frequency sampling information of at least 50 consecutive cycles before ...

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Abstract

The invention relates to a self-adaptive partial-discharge monitoring method and device for a sampling frequency. The method comprises the following steps: (1), detecting a UHF (Ultra High Frequency) signal; (2), achieving low-frequency sampling of the detected UHF signal, and meanwhile, judging whether a maximal amplitude value of the detected discharge voltage is continuously greater than a set threshold value, if no, proceeding low-frequency sampling, and if yes, carrying out high-frequency sampling, wherein low-frequency sampling information of at least 50 former continuous periods is saved while the high-frequency sampling is started; and (3), allowing the duration of the high-frequency sampling to be longer than a power frequency period, saving the high-frequency sampling information and terminating the sampling. The sampling method provided by the invention improves the precision of a monitoring system, the fault type correct identification rate and the economical efficiency.

Description

technical field [0001] The invention relates to a method and a device for partial discharge sampling in the field of intelligent substations. Background technique [0002] Partial discharge is a non-penetrating discharge phenomenon caused by local defects (such as air bubbles, cracks, suspended metal particles and electrode burrs, etc.) in the insulating medium caused by equipment during manufacturing and operation. An important symptom of insulation cracking in long-term operation. If the insulation structure of electrical equipment sustains partial discharge for a long time, the dielectric properties of the insulation may be severely damaged, which may eventually lead to catastrophic failure of the electrical equipment. Partial discharge detection can effectively reflect the insulation fault inside the transformer, and the partial discharge monitoring of high-voltage equipment has become one of the important contents of high-voltage equipment condition monitoring. The UH...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 王奎甫冯战申孟雷孙刚鄢靖丰陈艳格胡子义王闯王亚
Owner XUCHANG UNIV
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