Die Fähigkeit eines detaillierten Modells zur Diagnose axialer Verschiebungen in Transformatorwicklungen mit Hilfe von Übertragungsfunktionen

Int Trans Elec Energy Syst

Tenbohlen

2008

SUMMARYThis paper suggests a new method to detect the location and the extent of the winding buckling which is based on the transfer function (TF) estimation using the vector fitting (VF) method. To study the proposed method, the verified detailed model of the transformer winding in the frequency range of kHz < f < MHz has been developed. The simulation results indicate the capability of the proposed method to localize the deformed section in the transformer winding. In addition, the proposed method presents an index for the determination of the deformation extent.

Section: Buckling Simulation Resultsmentioning

confidence: 99%

Localization of winding radial deformation and determination of deformation extent using vector fitting‐based estimated transfer function

Int Trans Elec Energy Syst

Tenbohlen

2008

“…In References [3,12], two indexes have been presented for the determination of the displacement extent. One of them is the index of frequency deviation (IFD) and the other one is the index of magnitude deviation (IMD), as follows: Figure 2.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Investigations show that the detailed model, which is based on the self and mutual inductances, is the most appropriate method for the description of the magnetic field behaviour [10]. Therefore, this model has been used for the simulation of transient overvoltages [11], axial displacement and radial deformation in transformer windings [3,12] and studies on the correlation between the parameters of the detailed model and TF of transformer [13,14]. The parameters of this model are determined based on numerical field analysis methods, analytical methods or charge simulation methods [11].…”

Section: Detailed Modelmentioning

confidence: 99%

Determination of axial displacement extent based on transformer winding transfer function estimation using vector‐fitting method

Int Trans Elec Energy Syst

Tenbohlen

2007

SUMMARYThis paper suggests a new method to determine the extent of the axial winding displacement which is based on the transfer function (TF) estimation using the vector-fitting (VF) method. The identification of the TF in normal and displaced conditions can be achieved properly using VF methods. To study the different degrees of mechanical displacements, a verified detailed model of transformer in the frequency range of kHz < f

“…Therefore, this model has been used for the simulation of transient over-voltages (Gharehpetian et al, 1998), axial displacement and radial deformation in transformer windings (Rahimpour et al, 2001(Rahimpour et al, , 2003 and studies on the correlation between the parameters of the detailed model and TF of transformer (Satish and Sahoo, 2005a, b).…”

Section: Modeling Of Windingsmentioning

confidence: 99%

“…Therefore, the state-space representation of the detailed model can be presented by the following differential equation (Rahimpour, 2001):…”

Section: Modeling Of Windingsmentioning

confidence: 99%

Estimation of simulated transfer function to discriminate axial displacement and radial deformation of transformer winding

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

Ghanizadeh

et al. 2012

Purpose -The transfer function (TF) method is a reliable tool for the detection of the transformer winding deformation and displacement. One of the most important problems is the discrimination between these mechanical defects using a measured TF. The purpose of this paper is to suggest a new method based on the TF estimation, to detect the type of the mechanical defects in high voltage inhomogeneous winding of a power transformer, i.e. the winding is not homogeneous and has interleaved and inverted disks. Design/methodology/approach -The methodology of this paper is based on the estimation of the TF and in normal and defected cases can be properly achieved using vector fitting method. To study the mechanical defects, the detailed model of the transformer is in the frequency range of kHz , f. Findings -In this paper, comparison of Nyquist diagrams of the estimated TF curves result in a new discrimination method between mechanical defects and localization of the deformed section in the transformer winding. The interpretation of the TF changes is based on comparison of the Nyquist diagrams in a selected frequency range. Originality/value -This paper suggests new discrimination method between mechanical defects and localization of the deformed section in the transformer winding which is based on the TF estimation.