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Gas insulated metal-enclosed switchgear (GIS) is widely used in recent years for its high reliability, less maintenance and excellent insulation properties. But with the increasing use of GIS, the defects and failures also appear. According to the statistics, 30%∼40% of the GIS defects are caused by SF6 leakage. And the main reason of SF6 leakage is the defect of the sealing ring. This paper selects...
Detecting the partial discharge (PD) phenomenon in gas insulated switchgear (GIS) by using ultra-high-frequency (UHF) method is an effective diagnosis method to avoid insulation accidents. The most crucial part of UHF detecting system is ultra high frequency sensor. So a partial discharge (PD) sensor based on two-arm equiangular spiral antenna is designed and optimized in previous work. To examine...
It is of important to recognize the mechanical fault for extra-high voltage Circuit Breakers (CBs) in GIS, when the condition monitoring of CBs is realized. In this paper, a new efficiency fault recognition method is provided, by using improved Support Vector Machines (LibSVMs). The recognition methods, ANN and LibSVM are compared on their recognition accuracy, and the results show that the LibSVM...
Information extraction of building's height and density is an important aspect of urban remote sensing researches. Based on Quick Bird image classification, information of buildings can be extracted, and the density and landscape pattern of buildings can be analyzed, the height of buildings can be measured by calculating the length of the shadow. The results could provide scientific basis for town...
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