基于等效电路参数特征量的油纸绝缘老化状态评估  

Study on insulation condition of power transformer based on the equivalent circuit characteristic parameters

作　　者：贺德华[1] 蔡金锭[1] 黄云程[1] HE De-hua CAI Jin-ding HUANG Yun-cheng(College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电机与控制学报》2017年第6期44-49,共6页Electric Machines and Control

基　　金：国家自然科学基金(61174117)

摘　　要：针对油纸绝缘等效电路参数与绝缘老化机理内在关系的研究较少,通过对变压器油纸绝缘等效电路参数与老化状态之间的关系进行分析,提出了利用等效电路中极化支路的平均弛豫时间常数作为评估变压器油纸绝缘老化状态的特征量,该参数受绝缘系统几何结构影响较小。通过大量数据分析获得利用平均弛豫时间常数与油纸绝缘老化之间的规律:油纸绝缘老化越严重,则平均弛豫时间常数越小。最后利用变压器实例验证了该特征量评估绝缘老化状态的有效性,为评估变压器绝缘状态提供新的思路与方法。The study on the inner relationship between oil paper insulation equivalent circuit parameters and insulation aging mechanism is less and immature, and the relationship between the equivalent circuit parameters and oil paper insulation aging was analyzed in this paper. The influence of the equivalent circuit parameters on oil paper insulation aging of transformer was qualitatively studied. It is found that key parameter for evaluating insulation condition of power transformers, average relaxation time constant of equivalent circuit, was almost not affected by the geometry structure of the insulation system. Furthermore, the criterion was obtained to diagnose insulation condition of power transformers by using the average relaxation time constant of equivalent circuit. Meanwhile, the preliminary quantitative criterion was obtained by analyzing a lot of examples which were given to verify that the criterion is correct. The analysis results show that the method provides new ideas to diagnose insulation condition of power transformers.

关 键 词：油纸绝缘 回复电压 等效电路 平均弛豫时间常数 

分 类 号：TM85[电气工程—高电压与绝缘技术]