Journal ArticleDOI
Review of condition assessment of power transformers in service
TLDR
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.Abstract:
As transformers age, their internal condition degrades, which increases the risk of failure. To prevent these failures and to maintain transformers in good operating condition is a very important issue for utilities. Traditionally, routine preventative maintenance programs combined with regular testing were used. The change to condition-based maintenance has resulted in the reduction, or even elimination, of routine time-based maintenance. Instead of doing maintenance at a regular interval, maintenance is only carried out if the condition of the equipment requires it. Hence, there is an increasing need for better nonintrusive diagnostic and monitoring tools to assess the internal condition of the transformers. If there is a problem, the transformer can then be repaired or replaced before it fails. 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.read more
Citations
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Journal ArticleDOI
A review on machinery diagnostics and prognostics implementing condition-based maintenance
TL;DR: This paper attempts to summarise and review the recent research and developments in diagnostics and prognostics of mechanical systems implementing CBM with emphasis on models, algorithms and technologies for data processing and maintenance decision-making.
Journal ArticleDOI
Infrared thermography for condition monitoring – A review
TL;DR: This review focuses on the advances of IRT as a non-contact and non-invasive condition monitoring tool for machineries, equipment and processes.
Journal ArticleDOI
Partial discharge monitoring of power transformers using UHF sensors. Part I: sensors and signal interpretation
TL;DR: In this article, the propagation velocity matrix (PVM) and propagation time matrix (PTM) were introduced to detect partial discharge (PD) in power transformers, which can be used to index a database of physical descriptions of the transformer that could provide additional information to assist with diagnosis.
Journal ArticleDOI
An approach to power transformer asset management using health index
TL;DR: The Health Index as discussed by the authors represents a practical tool that combines the results of operating observations, field inspections, and site and laboratory testing to manage the asset and prioritize investments in capital and maintenance plans.
Journal ArticleDOI
Ensemble of data-driven prognostic algorithms for robust prediction of remaining useful life
TL;DR: An ensemble data-driven prognostic approach which combines multiple member algorithms with a weighted-sum formulation and the k-fold cross validation (CV) is employed to estimate the prediction error required by the weighting schemes.
References
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Journal ArticleDOI
IEEE and IEC Codes to Interpret Incipient Faults in Transformers, Using Gas in Oil Analysis
TL;DR: In this article, the Buchholz relay was used to detect incipient faults in oil immersed transformers by examination of the gases dissolved in the oil developed from the original Buchholtz relay application.
Journal ArticleDOI
Dissolved gas analysis: It can save your transformer
TL;DR: In this article, the use of dissolved gas analysis (DGA) to monitor the in-service behavior of transformers is discussed, and two commercial hydrogen-in-oil detectors are described.
Journal ArticleDOI
Status and trends in transformer monitoring
TL;DR: In this article, a survey of the most important methods for on-line monitoring and off-line diagnostics is given, and the area of life assessment is discussed, and in particular the difference between end-of-life of the insulating material and of the transformer is emphasized.
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.
Journal ArticleDOI
A new frequency response analysis method for power transformers
Peter Vaessen,E. Hanique +1 more
TL;DR: In this article, a novel frequency response analysis (FRA) method is described, which is being used on power transformers at the KEMA laboratories, and is applied to digitally recorded time signals, is easy to use, and provides high-resolution frequency spectra for both magnitude and phase.