基于阻抗法和频响法的变压器绕组变形评估技术及案例研究  

Transformer Winding Deformation Diagnosis Technology Based on Impedance Method and Frequency Response Method and Case Study

作　　者：李堃 刘君 陈沛龙 吕黔苏 曾华荣 徐舒蓉 高勇 LI Kun;LIU Jun;Chen Peilong;LYU Qiansu;ZENG Huarong;XU Shurong;GAO Yong(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China;Joint Laboratory of Ice Prevention&Disaster Reducing of China Southern Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵阳550002 [2]南方电网有限责任公司防冰减灾联合实验室,贵阳550002

出　　处：《电力大数据》2022年第8期84-92,共9页Power Systems and Big Data

摘　　要：绕组是变压器最重要的组部件。当外部短路电流穿越主变绕组后,在磁场的作用下产生强大的作用力致使绕组发生变形。变压器作为全密封结构无法通过肉眼直接观察变形情况,而传统的试验方法或者单一的评估手段无法准确评估出变压器绕组变形的真实情况。本文介绍了变压器绕组变形的危害以及绕组变形阻抗法和频响法的评估原理,并将两种方法进行结合提出了变压器绕组变形多维度综合评估技术,提高了变压器绕组变形评估的准确率,为网内大型变压器下一步的工作决策提供了强有力的技术指导。并将绕组变形多维度评估技术应用于网内的1台大型变压器上,将评估结果与变压器返厂吊罩解体情况进行相互验证,结果表明该绕组变形评估技术可以准确地评估变压器绕组变形的情况并可以做到较为准确的故障定位。最后,为提高绕组变形评估的准确性和降低变压器故障率提出合理化的建议。The winding is the most important component of the transformer.When the external short circuit current passes through the main transformer winding,a strong force under the magnetic field causes the winding deformation.As a fully sealed structure,the transformer cannot directly observe the deformation by the naked eye,while the traditional test method or a single evaluation method can not accurately evaluate the real situation of the transformer winding deformation.This paper introduces the harm of transformer winding deformation and winding deformation impedance method and frequency sound method evaluation principle,and combining the two methods of the transformer winding deformation multi-dimensional comprehensive evaluation technology,improve the accuracy of the transformer winding deformation evaluation,for the network of large transformer next work decision provides a powerful technical guidance.The winding deformation multi-dimensional assessment technology is applied to a large transformer in the network,and the assessment results and the disassembly of the transformer return factory ceiling cover are verified mutually.The results show that the winding deformation assessment technology can accurately evaluate the deformation of the transformer winding and achieve more accurate fault positioning.Finally,to improve the accuracy of winding deformation assessment and reduce the transformer failure rate.

关 键 词：变压器 阻抗法 频响法 绕组变形 故障定位 

分 类 号：TM935[电气工程—电力电子与电力传动]