摘要
绕组变形是电力变压器最容易发生的故障之一,未及时检测到的绕组变形增加了变压器发生灾难性事故可能性。为了准确灵敏地检测出任何轻微的绕组变形,在原有ΔU⁃I轨迹法的基础上提出了改进方法。文中首先阐述了原有方法的原理,并通过仿真说明了其在应用中所存在的缺陷。基于原有方法的不足,提出了负载标准化方法,解决了原方法在实际应用中受负载影响较大的问题;在此基础上,进一步提出了改进方法,并探究了测量误差对原方法和改进方法的影响情况。仿真结果表明,与原方法相比,改进方法在反映轻微绕组变形时具有更高的准确度和灵敏性。
Winding deformation is one of the most common faults in power transformers.The winding deformation which has not been detected in time increases the possibility of catastrophic accidents of transformer.In order to detect any slight winding deformation accurately and sensitively,an improved method is proposed on the basis of the original ΔU-I locus method.The principle of the original method is described firstly.The defect of it in the application is illustrated by simulation.Based on the shortcomings of the original method,the load standardization method is proposed,which solves the problem of the original method with big load influence in practical application and,on this basis,the modification method is proposed further.The influence of the measurement error on the original and the improved method is also discussed.The simulation results show that the improved method,compared to the original method,has higher accuracy and sensitivity in reflecting slight winding deformation.
作者
李振华
蒋伟辉
郑严钢
李振兴
徐艳春
LI Zhenhua;JIANG Weihui;ZHENG Yangang;LI Zhenxing;XU Yanchun(College of Electrical Engineering&New Energy,China Three Gorges University,Hubei Yichang 443002,China;Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station,China Three Gorges University,Hubei Yichang 443002,China;State Grid Chongqing Bishan Power Supply Company,Chongqing 402760,China)
出处
《高压电器》
CAS
CSCD
北大核心
2021年第8期142-150,共9页
High Voltage Apparatus
基金
国家自然科学基金资助项目(51507091).