矿物绝缘油浸纸在天然酯中的加速老化特性  

Accelerated ageing characteristics of mineral insulating oil-impregnated paper in natural esters

作　　者：黄伟嘉 李佳 王国庆 林旭钊 胡婷 张庆如 关伟民[3] HUANG Weijia;LI Jia;WANG Guoqin;LIN Xuzhao;HU Ting;ZHANG Qingru;GUAN Weimin(Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,China;Wuhan ZD New Materials Co.,Ltd.,Wuhan 430074,China;Wuhan University,Wuhan 430072,China)

机构地区：[1]广东电网有限责任公司广州供电局,广东广州510000 [2]武汉泽电新材料有限公司,湖北武汉430074 [3]武汉大学,湖北武汉430072

出　　处：《绝缘材料》2023年第8期32-36,共5页Insulating Materials

基　　金：南方电网公司科技项目(GZHKJXM20180141)。

摘　　要：城中村配电网中服役的配电变压器长期处于重过载运行状态,接近甚至超过其设计寿命的台数正不断增加,通过更换天然酯绝缘油来延长其服役时间是一种可行方法。本文测试并分析了经历不同时长加速热老化后的矿物绝缘油浸纸继续在天然酯中热老化的纤维素热解特性。然后通过油浸纸纤维素的热解动力学模型,对油浸纸更换天然酯后的残余寿命进行了预测。结果表明:油浸纸中残留的矿物绝缘油对更换天然酯后纤维素热解过程的影响可以忽略,绝缘纸的含水量是其热解反应的重要影响因素,更换天然酯能显著降低绝缘纸中的含水量,进而显著延缓绝缘纸纤维素的热老化速率。The distribution transformers serving in the distribution network of urban villages have been in heavy overload operation for a long time,and the number of transformers approaching or even exceeding their design life is increasing.Prolonging their service life by replacing natural ester insulating oil is a feasible method of life extension.In this paper,the thermal ageing characteristic of aged mineral insulating oil-impregnated paper in natural ester was tested to analyze the pyrolysis characteristics of cellulose.Then the residual life of oil-impregnated paper after replacing natural ester was predicted by the pyrolysis kinetic model of oil-impregnated paper cellulose.The results show that the influence of the residual mineral insulating oil in the oil-impregnated paper on the pyrolysis process of cellulose after replacing the natural ester can be ignored.The moisture content of insulating paper is an important factor affecting its pyrolysis reaction,and the replacement of natural ester can significantly decrease the moisture content of insulating paper and delay the pyrolysis rate of insulating paper cellulose.

关 键 词：天然酯 配电变压器 加速热老化 寿命 

分 类 号：TM214[一般工业技术—材料科学与工程] TM215[电气工程—电工理论与新技术]