Case Analysis of 220 kV Oil-immersed Current Transformer Defect

Li, Pei; Li, Hongbo; Niu, Lin; Gao, Nannan; Zhang, Yan; Zhang, Yanyan; Pei, Ying; Yin, Qudong

doi:10.1109/acpee48638.2020.9136484

Cited by 2 publications

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“…Studies have shown that detecting the composition and content of these characteristic fault gases is helpful to discover and judge the type and degree of faults. Among many methods for detecting these characteristic fault gases, chromatographic analysis is most commonly used because of its high detection sensitivity and good selectivity [13][14][15][16][17]. However, this method not only has a long detection time, high experimental environment requirements, expensive equipment, and complex operation but also can not perform real-time monitoring.…”

Section: Introductionmentioning

confidence: 99%

Gas-Sensing Properties of Dissolved Gases in Insulating Material Adsorbed on SnO2–GeSe Monolayer

Guo

Liang²,

Yang³

et al. 2022

Chemosensors

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In a transformer, the insulation materials will produce different dissolved gases due to various faults in the operation of the transformer, in which C2H2, CH4, and H2 are the main dissolved gases. In this study, the adsorption characteristics of the above three gases on the SnO2–GeSe monolayer surface were discussed and analyzed based on the density functional theory. The adsorption energy, transfer charge, geometric structure parameters, electronic density of states, electronic local function, charge difference density, and recovery time were calculated and compared to characterize the gas-sensing adsorption mechanism. The results showed that the SnO2–GeSe monolayer exhibited good adsorption capacity, selectivity, and repeatability for the three characteristic dissolved gases. After adsorbing CH4 gas molecules, the conductivity of the SnO2–GeSe monolayer decreased. After adsorbing C2H2 and H2 gas molecules, the conductivity of the SnO2–GeSe monolayer increased. Therefore, the SnO2–GeSe monolayer has great application potential in the real-time monitoring of dissolved gases in insulating materials, which may become a new type of resistive gas sensor.

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