中文摘要：

对矿物油、植物油、牛皮纸及热稳定纸组成的4种油纸绝缘样品在3种温度（90、110、130℃1下进行加速热老化试验，分析了油中水分和酸值随老化时间的变化规律。结果表明，油的类型是影响油中水分含量的主要因素：以BIOTEMP油为代表的植物油，油中水分含量较矿物油高且变化规律明显。不考虑实际变压器滤油处理等因素时，可考虑采用油中水分含量对该类植物油浸渍绝缘系统的老化程度进行评估。油的类型也是影响油中酸值的主要因素，含植物绝缘油组合中的油中酸值比普通变压器油中的酸值高；以Munksjo命名的热稳定纸组合，其酸值含量比普通牛皮纸的绝缘组合要低。

英文摘要：

Four different types of oil-paper insulations, respectively made by mineral oil, common Kraft paper, BIOTEMP oil and heat-stabilized paper, were thermally aged at three temperatures （90,110,130 ℃）. In the thermal aging tests, water content and neutral acid content in oil were analyzed. The results showed that the type of oil was the most important factor influencing water content in oil, and water content in vegetable oil represented by BIOTEMP was higher than that in mineral oil. It could be recommended to evaluate the ageing extent of the insulation system by water content in oil, with such factors as oil-filter treatment being neglected. The results also showed that the type of oil was the most important factor influencing neutral acid content in oil, and neutral acid content in vegetable oil was higher than that in mineral oil, and the content in heat-stabilized paper, named Munksjo, was lower than that in common Kraft paper.