变压器油纸绝缘电热联合老化机理研究
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引用本文:姜良民1,殷守斌1,徐珂1,田克强1,王智杰1,刘宏领1,时鹏1,李华强2.变压器油纸绝缘电热联合老化机理研究[J].电网与清洁能源,2022,38(5):86~94
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作者单位
姜良民1 1. 国网山东省电力公司菏泽供电公司 
殷守斌1 1. 国网山东省电力公司菏泽供电公司 
徐珂1 1. 国网山东省电力公司菏泽供电公司 
田克强1 1. 国网山东省电力公司菏泽供电公司 
王智杰1 1. 国网山东省电力公司菏泽供电公司 
刘宏领1 1. 国网山东省电力公司菏泽供电公司 
时鹏1 1. 国网山东省电力公司菏泽供电公司 
李华强2 2. 西安交通大学 电气工程学院 
基金项目:国网山东省电力公司科技项目(2020A-096);中国博士后科学基金(2019M653630)
中文摘要:变压器油纸绝缘系统在运行中需要承受电、热等共同作用,目前一般研究工作重点在电故障、热故障以及电或热老化对油纸的特性影响,而电热联合老化特性研究较少。该文通过研究油纸绝缘电热联合老化,对不同老化阶段油纸结构的聚合度,抗张强度和频域介电谱特性进行测量和研究。研究结果得到了电热联合老化条件下的聚合度的二阶模型以及聚合度与抗张强度的拟合公式。进一步研究频域介电谱发现随着老化时间的增加,在低频区εr和tan δ随频率的减小而有不同的增大趋势。在10-3,10-1Hz频率区εr和tan δ与绝缘纸老化状态有明显的相关关系,拟合得到在10-3、10-2及10-1Hz特征频率处的εr和tan δ值与绝缘纸聚合度的指数函数关系。该研究将为油纸绝缘在电热联合作用下的老化机理及应用FDS无损评估变压器油纸绝缘状态提供方案。
中文关键词:油纸绝缘  电热联合老化  聚合度  抗张强度  频域介电谱
 
A Study on the Electrical-Thermal Aging Mechanism of Oil-Paper Insulation in Transformers
Abstract:The oil-paper insulation system in power transformers suffers from both heat and electricity. The current research mainly focuses on the characteristic of electrical failure, thermal failure, electrical or thermal aging on the oil impregnated paper, but the investigation on the electrical-thermal aging is insufficient. In this paper, the polymerization degree, tensile strength and frequency domain dielectric spectroscopy properties of oil-paper structures at different aging levels are investigated through studies on the electrothermal combined aging of oil-paper insulation. The fitting formula of second order model of DP under electrothermal combined aging condition and the relationship between DP and tensile strength are obtained. A further study of dielectric spectrum in frequency domain shows that εr and tan δ in low frequency region increase with decreasing frequency with increasing aging time. Between 10-3-10-1 Hz frequency range, εr and tan δ are obviously correlated with the aging state of the insulating paper, and the relationship between the values of εr and tan δ at 10-3,10-2 and 10-1Hz characteristic frequencies and the degree of polymerization of insulating paper is obtained. This study provides a scheme for the electrical-thermal aging mechanism of oil-paper insulation and the application of FDS to nondestructive evaluation of transformer oil-paper insulation status.
keywords:oil-paper insulation  electrical-thermal aging  degree of polymerization  tensile strength  frequency domain dielectric spectroscopy
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