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首页> 美国卫生研究院文献>Polymers >Comparative Study on the Thermal-Aging Characteristics of Cellulose Insulation Polymer Immersed in New Three-Element Mixed Oil and Mineral Oil
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Comparative Study on the Thermal-Aging Characteristics of Cellulose Insulation Polymer Immersed in New Three-Element Mixed Oil and Mineral Oil

机译：浸入新型三元混合油和矿物油中的纤维素绝缘聚合物的热老化特性比较研究

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摘要

Cellulose paper, whose main component is cellulose polymer, has been widely used in oil-immersed power transformer that gradually deteriorates during transformer operation. Thermal aging is the main degradation form for cellulose paper immersed in insulation oil (oil–paper insulation) in a transformer. One of the most challenging issues in oil–paper insulation is inhibiting the aging of cellulose paper and extending its life. In this work, a comparative study was conducted on the thermal-aging characteristics of cellulose paper immersed in a novel three-element mixed insulation oil and mineral oil at 130 °C for 150 days. The key parameters of cellulose paper were analysed, including the degree of polymerization (DP), thermal-aging rate, surface colour, and AC breakdown voltage. The furfural content and acidity of the oil, as well as the AC breakdown voltage of the insulation oil were also analysed. The results show that the cellulose paper immersed in novel three-element mixed insulation oil had much higher DP values than that immersed in mineral oil after the same thermal-aging time. The mixed insulation oil could significantly inhibit the thermal aging of cellulose paper and prolong its life. The thermal-aging rate of the cellulose insulation polymer immersed in mixed insulation oil is significantly lower than that immersed in mineral oil, whether in the process of oil–paper insulation continuous aging or in the process of aging after oil replacement with unused insulation oil. The furfural generated by cellulose degradation in the novel three-element mixed insulation oil was also less than that in the mineral oil. The mixed insulation oil had a higher acidity value during the thermal-aging process, which was mainly due to the natural esters in the components of the mixed insulation oil. However, the AC breakdown voltage of the mixed insulation oil was always higher than that of the mineral oil. This study offers a new perspective in inhibiting the thermal aging of cellulose polymer in insulation oil.
机译：主要成分为纤维素聚合物的纤维素纸已广泛用于油浸式电力变压器中，该变压器在变压器运行过程中会逐渐变质。热老化是浸没在变压器绝缘油（油纸绝缘）中的纤维素纸的主要降解形式。油纸绝缘中最具挑战性的问题之一是抑制纤维素纸的老化并延长其使用寿命。在这项工作中，对浸渍在新型三元素混合绝缘油和矿物油中的纤维素纸在130°C下浸泡150天的热老化特性进行了比较研究。分析了纤维素纸的关键参数，包括聚合度（DP），热老化速率，表面颜色和AC击穿电压。还分析了该油的糠醛含量和酸度，以及绝缘油的交流击穿电压。结果表明，在相同的热老化时间下，浸入新型三元混合绝缘油中的纤维素纸的DP值要高于浸入矿物油中的纤维素纸的DP值。混合绝缘油可显着抑制纤维素纸的热老化并延长其寿命。浸入混合绝缘油中的纤维素绝缘聚合物的热老化速率明显低于浸入矿物油中的热老化速率，无论是在油纸绝缘层的持续老化过程中，还是在用未使用的绝缘油更换油后的老化过程中。新型三元混合绝缘油中纤维素降解产生的糠醛也少于矿物油。混合绝缘油在热老化过程中具有较高的酸度值，这主要是由于混合绝缘油成分中的天然酯所致。但是，混合绝缘油的交流击穿电压始终高于矿物油。这项研究为抑制绝缘油中纤维素聚合物的热老化提供了新的视角。

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