摘要
针对油纸绝缘变压器内部绝缘介质弛豫响应的复杂性,根据油纸绝缘结构特征,结合Maxwell电路理论,提出建立混联等效电路新模型来表征油纸绝缘弛豫过程。根据混联等效电路的理论分析,推导出混联等效电路参数和回复电压的求解公式。在混联等效电路基础上,提出一个利用p参数来诊断变压器油纸绝缘老化状态的新方法,为其后续绝缘诊断奠定基础。研究结果表明:混联等效电路p参数与极化电压、充电时间变化无关,利用p参数与变压器油纸绝缘系统的纸中微水含量之间的函数表达式可准确诊断变压器油纸绝缘系统老化状况;当p在区间(+∞, 0.323)时,变压器绝缘状态良好;当p在区间(0.193, 0.323)时,变压器绝缘老化较严重;当p在区间(0, 0.193)时,变压器绝缘老化严重。
Given the complexity of the dielectric relaxation response of transformer oil-paper insulation, this paper establishes a hybrid equivalent circuit new model to characterize the relaxation process of an oil-paper insulation system according to the characteristics of the oil-paper insulation and Maxwell circuit theory. The theory of a hybrid equivalent circuit offers a solution for the hybrid equivalent circuit parameters and the recovery voltage. On the basis of the hybrid equivalent circuit, it puts forward a new method to diagnose the aging condition of transformer oil-paper insulation by using the p parameter to lay the foundation for the follow-up insulation diagnosis. The results show that: the p parameter of the hybrid equivalent circuit has nothing to do with the polarization voltage and the charging time, and it can accurately diagnose the aging condition of the transformer oil-paper insulation system by using the function expression between the water content of the transformer oil-paper insulation system and the p parameter, when p is in the interval(+∞, 0.323), the transformer is well-insulated. When p is in the interval(0.193, 0.323), the insulation of the transformer is in a relatively serious condition, the value of p in the interval(0, 0.193) indicates serious aging insulation in the transformer.
作者
林智勇
张达敏
郑运鸿
康少波
杨贵志
LIN Zhiyong;ZHANG Damin;ZHENG Yunhong;KANG Shaobo;YANG Guizhi(College of Electrical Engineering and Automation,Xiamen University of Technology,Xiamen 361024,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2020年第15期164-169,共6页
Power System Protection and Control
基金
国家自然科学基金(51407151)
福建省科技厅引导性项目资助(2019H0039)
福建省教育厅中青年教师教育科研项目(JAT170425)
厦门理工学院“科研攀登计划”项目(XPDKQ18020)资助项目。
关键词
油纸绝缘
混联等效电路
变压器
p参数
oil-paper insulation
a hybrid equivalent circuit
transformer
p parameter
作者简介
林智勇(1989—),男,博士,讲师,主要研究方向为电气设备绝缘监测与故障诊断,E-mail:625720199@qq.com;张达敏(1983—),男,博士,副教授,主要研究方向为电力电子技术在电力系统中的应用。
