Title :
Double-ladder circuit model of transformer windings for frequency response analysis considering frequency-dependent losses
Author :
Zhang, H. ; Wang, S. ; Zhu, J. ; Guo, Y.
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
This paper presents a double-ladders circuit model of transformer winding for use in frequency response analysis (FRA) to diagnose the windings deformation. This model considers the nonlinear behavior of frequency-dependent parameter and core loss. A lumped parameter circuit model includes the axial and radial ladder network which are regarding to the winding discs and the eddy current paths of magnetic core, respectively. The frequency responses of voltage ratio are simulated and measured to verify the effective of this model, where the equivalent parameters are calculated by using 3-D finite element method (FEM).
Keywords :
finite element analysis; frequency response; ladder networks; lumped parameter networks; magnetic cores; transformer windings; 3D finite element method; FEM; axial ladder network; core loss; double-ladder circuit model; eddy current paths; frequency response analysis; frequency-dependent losses; frequency-dependent parameter; lumped parameter circuit model; magnetic core; nonlinear behavior; radial ladder network; transformer winding; voltage ratio; winding deformation; winding discs; Frequency measurement; Frequency response; Integrated circuit modeling; Magnetic cores; Mathematical model; Power transformers; Windings;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7156809
