Joint detection method aiming to GIS (geographic information system) partial releasing defect identification and location

A defect identification and joint detection technology, applied in the detection field of GIS partial discharge defect identification and location, to achieve the effect of rapid and accurate analysis and judgment

Inactive Publication Date: 2014-01-29
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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Problems solved by technology

[0009] The technical solution of the present invention is: a joint detection method for the identification and positioning of GIS partial discharge defects. The nature and location of the defect can be diagnosed on the eve of the GIS internal insulation fault, so as to prevent the occurrence of sudden accidents caused by insulation accidents; this method first measures the partial discharge of the GIS, due to various Electromagnetic interference, combined time-frequency analysis and wavelet transform to remove noise interference on the collected signals, and then pattern recognition on the collected partial discharge spectrum to judge the nature, location and degree of insulation deterioration of the partial discharge of the defect

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  • Joint detection method aiming to GIS (geographic information system) partial releasing defect identification and location

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Embodiment Construction

[0012] This method firstly measures the PD amount of GIS. Due to the various electromagnetic interferences existing in the GIS operation site, the collected signals are combined with time-frequency analysis and wavelet transform to remove noise interference, and then the collected PD spectrograms are modeled. Identification, to judge the nature, location and degree of insulation deterioration of the partial discharge of the defect; use the statistical feature method and the type feature method to extract the features of the partial discharge map to obtain the features that best reflect the nature of the classification, and then use the method of fuzzy identification. The extracted features are used to establish a feature database, and a membership degree discriminant function is established to realize fuzzy recognition. Finally, the X-ray detection technology is used to verify the location and properties of the defects detected by the PD spectrum. The digital subtraction method...

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Abstract

The invention relates to a joint detection method aiming to GIS (geographic information system) partial releasing defect identification and location and combines partial releasing detection technology and X-ray digital imaging technology to perform defect identification and location of GIS. The two detection methods are made the best of each other, are capable of timely and correctly detecting and insulating fault, effectively increasing GIS detection efficiency and detection accuracy and are capable of reasonably making maintenance strategies. All digital signal processing technologies are comprehensively utilized to process collected partial released signals and X-ray image signals respectively, and defects can be timely and rapidly identified and located without dismounting equipment.

Description

technical field [0001] The invention belongs to a detection method for electric equipment, and in particular relates to the technical field of a detection method for identifying and locating GIS partial discharge defects. Background technique [0002] GIS (Gas Insulated Enclosed Combined Electrical Appliance) is more and more used in the power system because of its advantages of small size and high reliability. Essentially, GIS is designed as a maintenance-free device. However, once a failure occurs, the repair time will be longer and the damage to the power system will be greater. [0003] GIS insulation faults are usually characterized by partial discharges prior to complete breakdown. If partial discharge exists for a long time, it will cause aging and deterioration of the insulation, and even cause the entire insulation breakdown or flashover along the surface, resulting in equipment failure during operation, and even large-scale power outages, resulting in huge direct ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01N23/04
Inventor 于虹程志万高阔董涛庞尔军
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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