Journal ArticleDOI
Detection and location of internal defects in the insulation of power transformers
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TLDR
In this paper, a quasi-simultaneous detection and location of internal defects in power transformers is presented, where the response of the insulating system to PD signals injected at least at three different sites of each winding (top, center, bottom) is calculated, or measured at the signal tap-off points (i.e., bushings).Abstract:
With the development of fast, and low-cost analog-digital converters (ADCs) and new mathematical procedures for waveform description, e.g., time encoded signal processing and recognition (TESPAR), novel approaches to detect and locate internal defects in the insulation of power transformers become feasible if the following requirements are fulfilled: the equivalent circuit of the insulating system, suitable for the fast partial discharge (PD) signals with risetimes of approximately 10 ns, is known; the response of the insulating system to PD signals injected at least at three different sites of each winding (top, center, bottom) is calculated, or measured at the signal tap-off points (i.e., bushings); and the pattern matrix of all calculated or measured signals exists: e.g., encoded and signal processes with TESPAR as a reference. The above mentioned requirements are examined for quasi-simultaneous detection and location of internal defects in power transformers. The method is applied to PD measurements on power transformers. >read more
Citations
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Journal ArticleDOI
Partial discharges. Their mechanism, detection and measurement
TL;DR: Different partial discharge detection and measurement procedures suitable for use on cables, capacitors, transformers and rotating machines are examined and compared in this paper, with particular attention given in regard to their suitability to different types of electrical apparatus and cable specimens under test as well as their applicability to discharge site location and their capability to detect different forms of PD.
Journal ArticleDOI
Condition monitoring techniques for electrical equipment-a literature survey
TL;DR: The popular monitoring methods for and research status of CM on transformers, generators, and induction motors, respectively are described and the potential benefits through the utilization of advanced signal processing and artificial intelligence techniques in developing novel CM schemes are pointed out.
Journal ArticleDOI
Partial discharge diagnostics and electrical equipment insulation condition assessment
TL;DR: Partial discharge (PD) measurement has been widely applied to diagnose the condition of the electrical insulation in operating apparatus such as switchgear, transformers, cables, as well as motor and generator stator windings.
Journal ArticleDOI
On-line partial discharge detection in cables
N.H. Ahmed,N.N. Srinivas +1 more
TL;DR: In this article, an on-line partial discharge (PD) detection technique applicable to power cables is described. But the method can be applied to both wire screen and solid shielded cables and can be used to check cable accessories such as splices and terminations.
Journal ArticleDOI
A new methodology for the identification of PD in electrical apparatus: properties and applications
TL;DR: In this article, the identification of basic PD source typologies (i.e., internal, corona and surface discharges) is then achieved, resorting to fuzzy algorithms.
References
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Journal ArticleDOI
Application of digital filtering techniques to the determination of partial discharge location in transformers
R.E. James,B.T. Phung,Q. Su +2 more
TL;DR: In this paper, the capacitatively transferred components of the input pulse along the windings in the appropriate frequency range were extracted by the aid of digital filtering techniques, and good agreement between measured and theoretical distributions was obtained.
Journal ArticleDOI
Discharge detection in high-voltage power transformers
TL;DR: In this article, the authors present the special problems involved in the detection of discharges within high-voltage power transformers and present a review of the various location techniques being developed in different parts of the world.
Proceedings ArticleDOI
The detection of partial discharges in power transformers using computer aided acoustic emission techniques
TL;DR: A computerized measurement and analysis system developed within the Electricity Commission of New South Wales which has proved to be both sensitive and accurate is described in this article, which was designed to facilitate the detection and location of partial discharges in power transformers during normal service operation.
Journal ArticleDOI
Interpretation of Partial Discharge Quantities as Measured at the Terminals of HV Power Transformers
TL;DR: In this paper, the application of signal processing techniques in the interpretation of partial discharge (PD) pulses as detected at the terminals of power transformers is discussed, and a description is given of experimental techniques using conventional discharge detectors and a computer-based measurement system.
Proceedings ArticleDOI
Dielectric losses in power transformers under high frequency transients
Ahmad El Sayed Ahmad,Ph. Auriol +1 more
TL;DR: In this article, a methodology for estimating network model parameters for dielectric losses is developed, where the winding capacitances are calculated by the finite element method, and the dielectrics losses are modeled by an equivalent RC network.
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