Extraction of New Characteristic Parameters and Aging Diagnosis for Transformer Oil-paper Insu-lation Based on Terminal Two-point Analytical Method

被引：0
|
作者：
Zhang X. [1 ]
Liu Q. [1 ]
Cai J. [1 ]
机构：
[1] Fujian Key Laboratory of New Energy Generation and Power Conversion, College of Electrical Engineering and Automation, Fuzhou University, Fuzhou
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Aging diagnosis; Depolarization current; Number of polarization low resistance branches; Oil-paper insulation; Polarization maximum straight spectrum; Terminal two-point analysis;
D O I：
10.13336/j.1003-6520.hve.20190924033
中图分类号：
学科分类号：
摘要：
In the research of time-division dielectric response for oil-paper transformer insulation aging diagnosis, there always exists uncertainty in the solution spectrum of the dielectric response spectra, the parameter calculation process is complex, and it is difficult to describe the physical meaning of the indirect extracted feature quantity. In accordance with the problem in the circuit model determination and the feature extraction, we propose a new method to diagnose the aging condition for transformer oil-paper insulation. Firstly, a terminal two-point analytical method of depolarization current spectrum is put forward to determine the insulation equivalent circuit for transformer oil-paper insulation, a new type of polarization maximum straight spectrum is drawn, and three new characteristic parameters, such as, the number of polarization low resistances lLow_R, the maximum slope of polarization aτmax, and the maximum intercept of polarization bτmax, are directly extracted. It is confirmed that, the more serious the aging of oil-paper insulation is, the larger the number of lLow_R will be, and the greater value of aτmax and bτmax will be. The analysis and calculation of experimental data of several transformers prove that the aging status for transformer oil-paper insulation can be effectively diagnosed through new characteristic parameters. The new method and characteristic quantity of equivalent circuit provide a new way to diagnose the aging of oil-paper insulation. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
引用
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页码：3317 / 3326
页数：9
相关论文
共 18 条
  • [1] Li Q., Li S., Si W., Et al., Analysis of the key problems about insulation condition assessment of oil-paper in power transformer based on partial discharge, Electric Power Automation Equipment, 43, 8, pp. 2558-2565, (2017)
  • [2] Tavakoli H., Bormann D., Engdahl G., Localization of mechanical deformations in transformer windings using time-domain representation of response functions, International Transactions on Electrical Energy Systems, 24, 1, pp. 16-29, (2014)
  • [3] Li G.X., Jiang X., Cai J., Et al., Dielectric response function for transformer oil-paper insulation solved by the method of differential depolarization current, High Voltage Engineering, 38, 8, pp. 1930-1936, (2012)
  • [4] Cai J., Liu Y., Cai J., Analysis of equivalent circuit of oil-paper insulating transformer relaxation response and aging evaluation, Transactions of China Electrotechnical Society, 31, 15, pp. 204-212, (2016)
  • [5] Li G., Jiang X., Cai J., Et al., Dielectric response function for transformer oil-paper insulation solved by the method of differential depolarization current, High Voltage Engineering, 38, 8, pp. 1930-1936, (2012)
  • [6] Wu G., Xia G., Song Z., Et al., State assessment of aging condition of transformer oil-paper insulation based on time domain dielectric spectroscopy and wavelet analysis, High Voltage Engineering, 44, 1, pp. 226-233, (2018)
  • [7] Jiang X., Huang Y., Lai X., Improved ant colony algorithm and its application in parameter identification of dielectric response equivalent circuit of transformer, High Voltage Engineering, 37, 8, pp. 1982-1988, (2011)
  • [8] Lin Z., Cai J., Novel method of calculation polarized equivalent circuit of oil-paper insulation, Electric Machines and Control, 18, 8, pp. 62-66, (2014)
  • [9] Li A., Cai J., Gan L., Et al., Parameter for calculation equivalent circuit of oil-paper insulation based on interval-particle swarm optimization algorithm, Advanced Technology of Electrical Engineering and Energy, 34, 4, pp. 37-42, (2015)
  • [10] Liao R., Liu J., Yang L., Et al., Investigation on frequency domain dielectric characteristics for condition assessment of transformer oil-paper insulation, Transactions of China Electrotechnical Society, 30, 6, pp. 247-254, (2015)
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