Fractional transmission line model of oil-immersed transformer windings considering the frequency-dependent parameters

被引：8
|
作者：
Liang, Guishu [1 ]
Gao, Shiqiang [1 ]
Wang, Yanchao [2 ]
Zang, Ying [3 ]
Liu, Xin [1 ]
机构：
[1] North China Elect Power Univ, Dept Elect Engn, Baoding, Peoples R China
[2] Datong Shanxi Power Supply Co, State Grid Elect Power Co, Datong, Peoples R China
[3] Shandong Elect Engn & Equipment Grp CO LTD, Jinan, Peoples R China
来源：
IET GENERATION TRANSMISSION & DISTRIBUTION | 2017年 / 11卷 / 05期
基金：
中国国家自然科学基金;
关键词：
transformer windings; transformer oil; finite element analysis; skin effect; permittivity; impedance parameter; admittance parameter; complex permittivity variation; fractional transmission line model; oil-paper samples; Cole-Cole model; single dielectric relaxation process; structure coefficient per unit length; finite element software; FEMM; fractional admittance PUL; frequency-dependent parameters; oil-immersed transformer windings; FAST TRANSIENTS; INSULATION; SIMULATION;
D O I：
10.1049/iet-gtd.2016.0877
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The frequency-dependent characteristics of the impedance parameter and the admittance parameter in the transmission line model of the transformer windings (TWs) are mainly result of the skin effect of the conductor and the complex permittivity's variation with the frequency of oil-paper, respectively. In this study, an accurate fractional transmission line model of TWs considering the frequency-dependent parameters is proposed. The measured permittivity of oil-paper samples is fitted based on the Cole-Cole model with single dielectric relaxation process, and then simplify the fitting model. The structure coefficient per unit length (PUL) corresponding to the complex capacitance of the TWs can be obtained based on the finite element software FEMM. Combining the simplified model with the structure coefficient, the fractional admittance PUL of TWs is derived. Then the fractional transmission line model of the TWs is determined. Finally, the calculated results of fractional transmission line model considering the frequency-dependent parameters are compared with the experimental measurements, and the results demonstrate the accuracy of the proposed model.
引用
收藏
页码：1154 / 1161
页数：8
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