Improvement on the anti-aging properties of power transformers by using mixed insulating oil

2010 International Conference on High Voltage Engineering and Application Pub Date : 2010-11-18 DOI:10.1109/ICHVE.2010.5640772

R. Liao, J. Hao, Lijun Yang, Shuaiwei Liang, Jianguo Yin

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引用次数: 20

Abstract

This paper is aimed at improving the anti-aging properties of power transformers via using mineral oil/natural ester mixtures (mixed insulating oil). Accelerated thermal aging of two kinds of oil-paper insulation at 110°C were conducted in order to compare the aging characteristics of Kraft paper immersed in mixed insulating oil and mineral oil. The extent of paper degradation after aging was determined using the paper degree of polymerization (DP). The dissipation factor of aged oils and papers in two kinds of oil-paper insulation, and the structure of papers immersed in mixed insulating oil and mineral oil were also investigated. Paper immersed in mixed insulating oil degrades at a slower rate than in mineral oil. Compared with mineral oil/paper insulation, the transesterification of cellulose impregnated with mixed insulating oil can restrain the aging of paper. After aging 782 days, the dissipation factor of mixed insulating oil is nearly all smaller than mineral oil from 10-1Hz to 106Hz, and the dissipation factor of paper aged in mixed insulating oil is smaller than paper aged in mineral oil from 10-1Hz to 103Hz.

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混合绝缘油对电力变压器抗老化性能的改善

采用矿物油/天然酯混合物(混合绝缘油)提高电力变压器的抗老化性能。为了比较牛皮纸在混合绝缘油和矿物油中的老化特性，对两种油纸绝缘材料在110℃下进行了加速热老化试验。用纸张的聚合度(DP)来测定老化后纸张的降解程度。研究了两种油纸绝缘材料中老化油和老化纸的耗散因素，以及混合绝缘油和矿物油中老化纸的结构。纸浸在混合绝缘油中的降解速度比浸在矿物油中的降解速度慢。与矿物油/纸绝缘相比，浸渍混合绝缘油的纤维素酯交换反应能抑制纸的老化。在老化782 d后，混合绝缘油的耗散系数在10-1Hz ~ 106Hz范围内几乎都小于矿物油，混合绝缘油老化的纸张耗散系数在10-1Hz ~ 103Hz范围内小于矿物油老化的纸张。

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2010 International Conference on High Voltage Engineering and Application

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