The Thermal Aging Characteristics of the New Anti-Aging Mixed Oil-Pressboard Insulation
Liao Ruijin1, Guo Pei1, 2, Zhou Nianrong3, Xia Huanhuan3, Lin Yuandi1, Liu Haibin1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. State Grid Ningbo Power Supply Company Ningbo 315016 China;
3. Yunnan Electric Power Research Institute (Group) Co. Ltd. Kunming 650217 China
In order to promote the application of mixed insulation oil in transformers, the preparation method of a new anti-aging mixed insulation oil with mass production has been developed. Then two kinds of oil-paper insulation samples were prepared with common insulation pressboard and insulation oil, namely new mixed insulation oil and mineral oil respectively. Accelerated aging experiments were performed under the 130℃ to analysis their dielectric properties, breakdown voltage and the general characteristics of aging products. The results show that: the properties of new mixed insulation oil meet the requirements of GB 2536—2011 and it can delay the aging process of oil-paper insulation system. The breakdown voltages of new mixed insulation oil and its impregnated insulation pressboard at different aging time are mostly higher than that of relevant mineral oil and its impregnated insulation pressboard respectively. With the increase of temperature,the breakdown voltages of two kinds of insulation pressboard at early aging time decrease while at later aging time decrease firstly and then increase. The relative dielectric constant and the ratio of relative dielectric constants of new mixed insulation oil and its impregnated insulation pressboard at different aging time are higher than that of relevant mineral oil and its impregnated insulation pressboard. This indicates that new mixed insulation oil improves the distribution uniformity of electric field in insulation oil and insulation pressboard, which is helpful to the miniaturization of transformer manufacturing.
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