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As the important part of the transformer insulating, the insulation performance of oil-paper directly affects the security and stable operation of the transformer. In order to study the influence of temperature and thermal aging on the breakdown voltage of oil-paper insulation, breakdown voltage test of transformer's oil-paper was carried out, and breakdown voltages of oil-paper insulation were obtained...
The thermal aging is one of the main factors leading to degradation of oil-paper insulation. Carbon oxides dissolved in insulation oil mainly come from cellulose pyrolysis, which indicates that the carbon oxides in oil can be used to predict the thermal aging degree of oil-paper insulation in power transformer. In this paper, accelerated thermal aging test for oilpaper samples composed of conventional...
This article aims to contrastively study the thermal aging characters under different temperature between natural ester and mineral oil-pressboard insulation system. The thermal aging experiment was conducted with copper flat bars together in a sealed stainless vessel at 130 °C for 80 days, and at 100 °C for 220 days separately. Some basic physicochemical and electric characteristics of oil and cellulose...
The insulating performance of transformer oil is vulnerable to metallic particles, especially oil used in HVDC converter transformers. The electric field distribution in converter transformer insulating oil is different from that in traditional AC transformer insulating oil, so extra attention should be paid to the influence of metallic particles on its breakdown voltage. This paper investigated the...
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