频响法在线监测变压器绕组变形的传递函数构建及其灵敏度分析  

Construction of Transfer Functions and Sensitivity Analysis of Frequency Response Analysis Method for On-line Monitoring Transformer Winding Deformations

作　　者：郑丹阳 程养春[2] 彭磊 毕建刚 常文治 ZHENG Danyang;CHENG Yangchun;PENG Leil;BI Jiangang;CHANG Wenzhi(Beijing Key Laboratory of High Voltage&EMC,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]华北电力大学新能源电力系统国家重点实验室,北京102206 [3]中国电力科学研究院有限公司,北京100192

出　　处：《高电压技术》2023年第4期1534-1544,共11页High Voltage Engineering

基　　金：国家电网有限公司总部科技项目(SGAHDK00SPJS 1900073)。

摘　　要：离线频响法的传递函数难以应用于运行中变压器的绕组变形检测,因而构建了适用于在线监测的传递函数,并对比分析了其反映变形缺陷的能力。基于多端口电路网络理论,分别构造了适用于中性点接地和中性点不接地的带电运行变压器的3种传递函数;参考实际180 MVA/220k V变压器绕组参数,建立了三相双绕组变压器多导体传输线模型,计算了鼓包和位移变形时各传递函数的频响曲线及其8种特征参数。对比结果表明:在线传递函数的相关系数和欧氏距离的数值、随变形量变化的线性度、对变形量的灵敏度与离线传递函数基本一致;各传递函数特征参数的线性度达到0.8以上,对鼓包变形的灵敏度大约是位移变形的40%。所构造的传递函数不仅适用于带电检测,而且性能与离线传递函数基本一致。The transfer function of off-line frequency response method is difficult to be applied to the winding deformation detection of transformer in operation.In this paper,transfer functions suitable for online monitoring are constructed and their ability to reflect deformation defects is compared and analyzed.Based on the theory of multi-port circuit network,three transfer functions for the neutral earthed and ungrounded live operating transformers are constructed,respectively.Based on the actual winding parameters of 180 MVA/220 kV transformer,a three-phase double-winding transformer multi-conductor transmission line model is established,and the frequency response curves of each transfer function and eight characteristic parameters are calculated under the conditions of bulging and displacement deformation.The comparison results show that the correlation coefficient,Euclidean distance,linearity with deformation and sensitivity to deformation of the online transfer function are basically consistent with those of the offline transfer function.The linearity of the characteristic parameters of each transfer function is above 0.8,and the sensitivity to bulging deformation is about 40%of the displacement deformation.The constructed transfer functions not only are suitable for live detection,but also have the same performance as the offline transfer function.

关 键 词：电力变压器 绕组变形 频响分析 在线监测 传递函数 

分 类 号：TM40[电气工程—电器]