A Partial Discharge Detection Method Based on Ultrasonic

Abstract

The invention discloses a supersonic wave based partial discharge detection method. The method comprises the steps of supersonic signal collection and pre-processing, abnormal signal interval detection, characteristic vector extraction, partial least squares based dimension reduction optimization, and vector machine based fault and faultless classification. A supersonic wave detection method is used to carry out partial discharge detection on a switchgear, a supersonic signal is analyzed and processed to predict an insulation state of the switchgear; an audio signal processing technology and amode identification classification algorithm are used to carry out down-conversion on the supersonic signal, and a signal within the voice frequency range is obtained; a signal characteristic parameter representing partial discharge is extracted; via partial least squares based dimension reduction optimization, the complex degree of the algorithm is reduced; and further advance voice identification technology and mathematical classification model to realize intelligent identification. Thus, partial discharge condition in the switchgear can be detected online intelligently in a non-intruding way, and the insulation condition of the switchgear is detected and diagnosed.

Description

technical field [0001] The invention relates to the technical field of partial discharge state detection of switch cabinets, in particular to an ultrasonic-based partial discharge detection method. Background technique [0002] The occurrence of the partial discharge phenomenon will be accompanied by the physical change process of the sound. In recent years, many researchers at home and abroad have devoted themselves to the research and comparison of the detection technology of the partial discharge of the switchgear. A variety of detection methods have been proposed for the partial discharge of the switchgear. Electric pulse detection, ultra-high frequency detection, electromagnetic wave detection, light detection and ultrasonic detection. [0003] The switchgear is a closed device. In order not to affect the normal operation of the switchgear, domestic and foreign power operation units tend to adopt non-intrusive detection; It is an important means for the department to d...

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Problems solved by technology

[0003] The switchgear is a closed device. In order not to affect the normal operation of the switchgear, domestic and foreign power operation units tend to adopt non-invasive detection; in recent years, the on-line partial discharge detection of switchgear based on ultrasonic has been applied as a It is an important means for the department to detect and diagnose the insulation status of switchgear, but most of its detection is based on the threshold value to detect the principle of "traffic lights" and the auxiliary detection of abnormal partial discharge sound with the help of human ears, and the analysis of ultrasonic signals generated by partial discharge It only stays in the primary detection stage of detecting the signal amplitude or listening to the audio signal sound converted from ultrasonic down-conversion, and there is no in-depth application research; the detection method has defects such as single criterion and low detection reliability

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