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

被引：0
作者：
Zheng D. [1 ]
Cheng Y. [2 ]
Peng L. [1 ]
Bi J. [3 ]
Chang W. [3 ]
机构：
[1] Beijing Key Laboratory of High Voltage & EMC, North China Electric Power University, Beijing
[2] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
[3] China Electric Power Research Institute, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 04期
关键词：
frequency response analysis; online detection; power transformer; transfer function; winding deformation;
D O I：
10.13336/j.1003-6520.hve.20220125
中图分类号：
学科分类号：
摘要：
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. © 2023 Science Press. All rights reserved.
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页码：1534 / 1545
页数：11
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