Journal ArticleDOI
Monitoring of power transformers using the transfer function method
Thomas Leibfried,K. Feser +1 more
TLDR
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.Abstract:
Summary form only given as follows. The transfer function concept is well known as an additional method of evaluating the impulse test of power transformers in the test laboratory. Another application for this method is monitoring of power transformers in service. According to the method of how to measure transient signals for the calculation of transfer functions, two kinds of monitoring can be distinguished: off-line and on-line monitoring. Both kinds of monitoring as well as their influencing factors are discussed with on-site measurements on power transformers in service.read more
Citations
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Journal ArticleDOI
Review of condition assessment of power transformers in service
TL;DR: In this article, an extensive review is given of diagnostic and monitoring tests, and equipment available that assess the condition of power transformers and provide an early warning of potential failure, which is a very important issue for utilities.
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 tank vibration modeling as a method of detecting winding deformations-part I: theoretical foundation
TL;DR: In this article, a model developed for a transformer monitoring system to estimate transformer tank vibration is presented, which takes into account the main physical phenomena generating vibrations in the different transformer elements and how these vibrations are superposed and transmitted to the tank.
Journal ArticleDOI
Procedures for detecting winding displacements in power transformers by the transfer function method
J. Christian,K. Feser +1 more
TL;DR: 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.
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.
References
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Journal ArticleDOI
Impulse testing of power transformers using the transfer function method
Ryszard Malewski,B. Poulin +1 more
TL;DR: In this article, the transfer function of a transformer winding is deconvoluted in the frequency domain from the digitally recorded neutral current and high voltage applied during impulse tests, and the integrity of the winding insulation is determined by comparing the transferred function obtained at full and reduced test voltage.
Journal ArticleDOI
Measurement of switching transients in 735 kV substations and assessment of their severity for transformer insulation
TL;DR: In this paper, an automatic measuring system that digitally records transients generated by EHV-transmission-system switching operations and lightning strokes has been developed, and the severity of these transients was assessed by comparing them with test voltages applied to the transformers during acceptance tests.
Journal ArticleDOI
Improved Fiberoptic Temperature Measurement System for Monitoring Winding Temperatures in Medium and Large Transformers
TL;DR: In this article, a fiberoptic system designed specifically to meet these needs and describes a cost-effective approach to installation and utilization which should now make practical the general field instrumenting of medium and large transformers.
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Procedures for detecting winding displacements in power transformers by the transfer function method
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