Abstract
The running condition of negative pressure is existed in the metal expander of oil-immersed inverter-type current transformer, which affects the internal water distribution in oil-paper of the current transformer. Thus, we carried out tests to measure water saturation solubility in insulation oil on different oil samples under different pressures and temperatures, and found that the water saturation solubility in oil would decrease with the increase of vacuum degree, resulting in water transferring from oil to paper or suspending in oil. According to these results, we introduced a shifting factor n related to pressure to establish a mathematical expression involving pressure in expander, temperature, and water saturation solubility in oil by Arrhenius equation. Based on previous studies, we took the acid value in oil, temperature and pressure as an evaluation system to comprehensively evaluate the water saturation solubility in insulation oil, and the influence law of the multiple factors was obtained. The water content and the insulation condition of oil-paper insulation of the oil-immersed inverter-type current transformer could be evaluated more accurately by using the results mentioned above.
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