A gis partial discharge detection system and method

Abstract

The invention discloses a GIS partial discharging detection system which comprises a partial discharging ultrasonic subsystem and a partial discharging ultrahigh frequency subsystem. The partial discharging ultrasonic subsystem and the partial discharging ultrahigh frequency subsystem are connected with a computer. Further disclosed is a detection method. The detection method comprises the steps of (1) detecting a detected GIS, uploading the detection results to the computer, (2) allowing the computer to carry out data processing and identification on the results detected through the ultrasonic detection method, giving evidences according to the detection results to assign a function value to an elementary probability of a target, namely the assigned probability, (3) calculating evidence space of each GIS fault, and (4) confirming diagnosis results, namely diagnosis types according to diagnosis decisions. According to the GIS partial discharging detection system and method, the partial discharging faults of the GIS can be accurately found, accuracy for identifying the fault types can be improved, maintenance of the GIS is promoted to be developed from periodic maintenance and accident maintenance to state maintenance and reliability maintenance, and detection accuracy is improved.

Description

technical field [0001] The invention relates to a detection system and method, in particular to a GIS partial discharge detection system and method. Background technique [0002] Gas Insulated Substation (GIS) is widely used in power systems due to its compact structure, small footprint, unaffected by the external environment, high operational reliability, and long maintenance cycle. occupy an increasingly important position. [0003] At present, the main methods for GIS partial discharge detection at home and abroad include electric pulse detection method, ultrasonic detection method, light measurement method, chemical detection method, ultra-high frequency method and so on. Among them, the ultrasonic detection method and the ultra-high frequency method have good application prospects due to their common advantages of high sensitivity, easy implementation of charged detection, and pattern recognition and quantitative analysis. [0004] The sound signal excited by partial ...

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Problems solved by technology

[0007] At present, the above two methods are used for GIS partial discharge live detection. The disadvantage of the UHF method is that there are no corresponding international and domestic standards at present, and it cannot give a result of the magnitude of the discharge; because the UHF sensor can only be installed in the GIS. Potty insulators, so accurate positioning cannot be achieved

The disadvantage of ultrasonic is that it is easily affected by the surrounding environment, especially if the equipment itself has a certain vibration during operation, it will cause a large error in ultrasonic detection.

There are certain inaccuracies in the test results, which will often cause misjudgments and missed judgments of faults, which has its limitations.

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