The Influence of Organic Acid on Thermal Aging of Power Transformer Oil-paper Insulation

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2013-10-01 DOI:10.1109/CEIDP.2013.6748119

Cui Yunguang, Wu Guangning, Wang Xiaojian, Peng Qian, Chen Ling, G. Bo

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引用次数: 8

Abstract

To research the influence of one of the aging product (organic acid) of cellulose on oil-paper insulation, low molecular weight of the carboxylic acid (formic, acetic) and high molecular weight of the carboxylic acid (stearic) have been added to new electric insulating oil to arrive at a neutralization value of 0.3mgKOH/g, the initial moisture content in insulation paper have been controlled at 0.5% and 2.75%. The distribution characters of organic acid in oil-paper insulation and the influence of organic acid on thermal aging of oil-paper insulation at 70°C, 90°C and 110°C have been investigated. Experimental results show that formic and acetic could be easily absorbed by insulation paper while stearic could easily dissolve in electric insulating oil. There is no significant influence of temperature and initial moisture content on the distribution characters of organic acid in oil-paper insulation. Low molecular acid would work together with moisture to accelerate the aging speed of insulation paper.

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有机酸对电力变压器油纸绝缘热老化的影响

为研究纤维素老化产物之一(有机酸)对油纸绝缘性能的影响，在新型电绝缘油中加入低分子量羧酸(甲酸、乙酸)和高分子量羧酸(硬脂酸)，达到中和值0.3mgKOH/g，将绝缘纸初始含水率控制在0.5%和2.75%。研究了有机酸在油纸绝缘材料中的分布特征，以及有机酸对油纸绝缘材料在70℃、90℃和110℃时热老化的影响。实验结果表明，甲酸和乙酸易被绝缘纸吸附，硬脂酸易溶于电绝缘油。温度和初始含水率对油纸绝缘材料中有机酸的分布特征无显著影响。低分子酸会与水分共同作用，加速绝缘纸的老化速度。

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2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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