摘要
频率响应法常与变压器绕组等值电路结合起来共同分析变压器的频响机理和绕组状态,而绕组建模是必要的基础性工作。为此,提出了一种基于有限元法的变压器绕组建模方法。利用有限元仿真软件ANSYS Maxwell建立了电力变压器（容量为400kVA,连接组别为YNyn0）的有限元模型,结合推导的基于单饼的变压器绕组纠结和顺序缠绕方式的等值纵向电容计算方法,求解得到了变压器的主要电气参数并搭建了绕组的等值集总参数电路,然后对健康和饼间短路故障绕组进行了仿真和实测研究。研究结果表明：缠绕方式是绕组建模需要考虑的一个重要影响因素;健康绕组和短路故障绕组所得仿真和实测扫频频响曲线走势均大体一致,部分谐振点谐振频率几乎重合,前者第3、4、6、7个谐振峰值和第2、4、6、7、9个谐振谷值对应频率基本一致,最大误差为6.76%,验证了电路模型以及计算方法的正确性。该建模方法具有直观、方便、简单的特点,后期可用于探索研究更多变压器绕组变形,辅助实现故障模式识别等。
Equivalent circuit of transformer winding is usually combined with the frequency response method to analyze the frequency response mechanism and winding condition. The modeling of winding is a necessary basic work. Therefore, we proposed a modeling method of transformer winding based on finite element method. The finite element simulation software ANSYS Maxwell was used to establish an actual power transformer（400 k VA, YNyn0） model. The computational methods of equivalent longitudinal capacitance based on single disk of interleaved winding and sequential winding were deduced. Combined the model and the algorithm, main circuit parameters of the transformer were calculated, and an equivalent lumped parameter circuit of the high voltage winding was built. Moreover, healthy and short circuit fault windings were simulated and experimentally researched. The research results show that the winding mode is an important factor to be considered in winding modeling. The trends of simulated and measured sweep frequency response curves of the health winding and short circuit fault winding are approximately identical, part of the resonant frequencies of the resonant points are almost coincident. The third, fourth, sixth, seventh resonant peaks and the second, fourth, sixth, seventh, ninth resonant valleys of simulated frequency response curves are consistent respectively with the maximum error of 6.76%. The correctness of circuit model and computational method are verified. This modeling method is intuitive, convenient, simple, and can not only be used to explore more transformer winding deformations, but also assist in the realization of fault pattern recognition in the future.
作者
姚陈果
胡迪
赵仲勇
赵晓震
高竣
YAO Chenguo;HU Di;ZHAO Zhongyong;ZHAO Xiaozhen;GAO Jun(State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology,School of Electrical Engineer-ing,Chongqing University,Chongqing 400030,China;State Grid Chengdu Electric Power Corporation,Chengdu 610000,China;College of Engineering and Technology,Southwest University,Chongqing 400715,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第11期3517-3523,共7页
High Voltage Engineering
基金
国家自然科学基金(51377175)~~
关键词
电力变压器绕组
频率响应
等值电路
有限元法
电路参数
谐振频率
power transformer winding
frequency response
equivalent circuit
the finite element method
circuit pa-rameters
resonant frequency
