Journal ArticleDOI
Procedures for detecting winding displacements in power transformers by the transfer function method
J. Christian,K. Feser +1 more
TLDR
In this article, three different ways of using the transfer function method for detecting mechanical winding displacements in power transformers are investigated, and the most reliable approach is time-based comparison, which requires finger print data from a previous measurement.Abstract:
The paper investigates three different ways of using the transfer function method for detecting mechanical winding displacements in power transformers. The most reliable approach is time-based comparison , which requires finger print data from a previous measurement. Such information is, however, usually not available. For multilegged transformers without zigzag-connected windings the results of separately tested legs can be used as mutual references (construction-based comparison ). A third approach is to compare the transfer functions with those obtained from an identically constructed transformer ( type-based comparison). However, for a transformer with given nominal specification data, the winding design may over time undergo changes which causes changes to the transfer function. It is proposed to solve this problem by calculating tolerance bands using transfer functions from a big group of the same-type transformers. A novel statistical algorithm for this purpose is presented. The approach is demonstrated for a set of 28 specified identically 200-MVA power transformers.read more
Citations
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Journal ArticleDOI
Advanced transformer winding deformation diagnosis: moving from off-line to on-line
TL;DR: In this article, the authors have concentrated on issues arising while on-line transformer winding deformation diagnosis is going to be applied on transformers with various kinds of techniques, such as frequency response analysis (FRA), short circuit impedance measurement and transfer function measurement.
Journal ArticleDOI
Mathematical Comparison Methods to Assess Transfer Functions of Transformers to Detect Different Types of Mechanical Faults
TL;DR: In this paper, the transfer function (TF) is used to detect different types of mechanical damage in power transformers, such as disc-space variation, radial deformation, and axial displacement.
Journal ArticleDOI
Interpretation of Transformer FRA Responses— Part I: Influence of Winding Structure
TL;DR: In this paper, the authors address one of the major factors that affect the FRA responses: the winding structure itself, which can be categorized into windings with either high- or low-series capacitance in proportion to the shunt capacitance.
Journal ArticleDOI
Transformer winding faults classification based on transfer function analysis by support vector machine
TL;DR: In this paper, a support vector machine (SVM) is used for transformer winding fault classification using transfer function (TF) analysis and two different features extracted from the measured TFs are then used as the inputs to SVM classifier for fault classification.
Journal ArticleDOI
Improved power transformer winding fault detection using FRA diagnostics – part 1: axial displacement simulation
TL;DR: In this paper, a single-phase transformer is simulated using 3D finite element analysis to emulate the real transformer operation and the impact of axial displacement of different fault levels on the electrical parameters of the equivalent circuit is investigated.
References
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Journal ArticleDOI
The Fourier Integral and its Applications
Journal ArticleDOI
Transfer function method to diagnose axial displacement and radial deformation of transformer windings
TL;DR: In this article, a transfer function method is presented as a tool to detect axial displacement and radial deformation of transformer windings using two test transformers and detailed mathematical models were developed for the test objects and a comparison was carried out between measured and calculated results.
Journal ArticleDOI
Transformer Diagnostic Testing by Frequuency Response Analysis
E.P. Dick,C.C. Erven +1 more
TL;DR: In this article, a frequency response analysis (FRA) method was used to measure wind deformation in power transformers, and the results indicated that benchmark reference data was not always necessary to identify certain kinds of mechanical damage.
Journal ArticleDOI
Monitoring of power transformers using the transfer function method
Thomas Leibfried,K. Feser +1 more
TL;DR: The transfer function concept is well known as an additional method of evaluating the impulse test of power transformers in the test laboratory and another application for this method is monitoring of power transformer in service as discussed by the authors.
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Monitoring of power transformers using the transfer function method
Thomas Leibfried,K. Feser +1 more