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Partial Discharge (PD) is considered to be one of the main reasons for aging and degradation of the oil/pressboard insulation system in power transformers. Vegetable oils which own excellent dielectric performance are introduced as potential insulation liquids substituting traditional mineral oil. In this paper, an air-gap PD model was adopted to investigate the PD characteristics of refined rapeseed...
Methyl ethyl ketone dissolved in transformer oil can be used as the mark of thermal insulation degradation. As an effective detecting method for trace liquid, Laser Raman Spectroscopy (LRS) is more suitable for in-situ detecting methyl ethyl ketone concentration than traditional detection methods. The application of LRS in detecting methyl ethyl ketone concentration has been studied. Firstly, the...
Based on the platform for testing development characteristics of partial discharge in laboratory, typical surface discharge model was built up at first. Constant voltage testing on the model was performed to research the development process of surface discharge. The variation of total partial discharge energy per unit of time (Wtotal) was analyzed and the results show that the surface discharge development...
Partial discharge in oil-paper insulation is one of the main reasons for aging and disruption of the power transformer. Understanding the emergence of partial discharge and the gas variation law in time can determine the development of internal latent fault. Therefore, based on the air-gap discharge model, which is the primary discharge type, partial discharge characteristics and gas generation law...
Power transformer is one of the most important apparatus in the power system. Incipient faults in transformer can degrade both oil and cellulose insulation, leading to the formation of dissolved gases. Partial discharge (PD) is regarded as a cause as well as an indicator of the insulation degradation. This paper presents a study on the correlation between oil dissolved gas generation and cavity discharges...
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