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Journal ArticleDOI

Simulation of faults during impulse tests

TL;DR: In this article, experimental results on fault simulations during impulse tests across windings and other specifically designed networks are reported, both breakdown and partial discharge studies are conducted with digital acquisition of fault records.
Abstract: Experimental results on fault simulations during impulse tests across windings and other specifically designed networks are reported. Both breakdown and partial discharge studies are conducted with digital acquisition of fault records.
Citations
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Journal ArticleDOI
TL;DR: In this paper, an objective formulation of the impulse analysis problem from a signal analysis viewpoint is proposed, where the winding response is quintessentially that of a deterministic network to a finite energy signal, with breakdown and partial discharge being inherently nonlinear events.
Abstract: We propose an objective formulation of the impulse analysis problem from a signal analysis viewpoint. The winding response is quintessentially that of a deterministic network to a finite energy signal, with breakdown and partial discharge being inherently nonlinear events. A significant improvement to the acquisition of waveforms is demonstrated by a virtual instrument approach. It retains the advantages of the time- and frequency-domain methods. The drawbacks of the transfer function method are highlighted and a new piecewise linear approach is proposed for analysis. Experiments on a discrete lumped parameter model of the winding are used to validate the PXI based instrument.

30 citations


Cites background or methods from "Simulation of faults during impulse..."

  • ...It is well known that a lumped parameter model can be used to characterize the high frequency behavior of a winding [10]....

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  • ...Fault simulation studies [9], [10] form the basis of the analysis tool....

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  • ...This was seen in the examples shown in [10]....

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Journal ArticleDOI
TL;DR: In this article, future template numerical interpretation techniques are proposed for location of partial discharge (PD) pulse duration from 0.1μs to 5μs in transformer windings using sweep frequency response analysis (SFRA) principle.

10 citations

Proceedings ArticleDOI
20 Dec 2004
TL;DR: In this paper, an objective formulation of the impulse testing procedure is proposed based on models for winding response as well as fault models, and experimental validation of the fault models for breakdown and partial discharge is provided.
Abstract: An objective formulation of the impulse testing procedure is proposed based on models for winding response as well as fault models. Experimental validation of the fault models for breakdown and partial discharge (PD) is provided. A new adaptive filtering approach is proposed for analysis during impulse tests. The procedure is validated with experimental investigation on a 10 section lumped parameter network.

4 citations


Cites background or methods from "Simulation of faults during impulse..."

  • ...The.elecrrodes were intum connected to taps in a uniform layer windingkof lo00 tums[ 3 ] across 20% of the winding....

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  • ...In order to represent a partial discharge the classic 'ah' model is used [ 3 ]....

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Journal ArticleDOI
TL;DR: In this article, the cause of high-frequency oscillations presented by distribution transformers in impulse tests was investigated and internal imperfections, such as cavities and floating particles, were found to cause these oscillations.
Abstract: Investigations, through a sample evaluation, aiming to evaluate the cause of the high-frequency oscillations presented by distribution transformers in impulse tests reveal that internal imperfections, such as cavities and floating particles, cause these oscillations.

2 citations


Cites methods from "Simulation of faults during impulse..."

  • ...This correlation is coherent because similar high-frequency oscillations were obtained through a PD simulation circuit during impulse tests [24]....

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Proceedings ArticleDOI
31 Oct 2008
TL;DR: In this paper, a consistent laboratory reproduction of waveforms during impulse tests with solid insulation materials has been a difficult task, and carbon polyethylene composites can serve as benchmarks for such studies.
Abstract: A consistent laboratory reproduction of waveforms during impulse tests with solid insulation materials has been a difficult task. Carbon polyethylene composites can serve as benchmarks for such studies. Experimental results on films and a practical voltage transformer (VT) are shown that can help develop signal analysis tools.

1 citations

References
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Journal ArticleDOI
30 Jan 2004
TL;DR: In this article, an objective classification of faults that can occur during impulse tests on power transformers is proposed, including nonlinear elements, breakdown, and partial discharge events, and an analysis of a layer winding, in the time and frequency domains, with these faults shows that current assessment methods must be used with caution.
Abstract: An objective classification of faults that can occur during impulse tests on power transformers is proposed. It includes nonlinear elements, breakdown, and partial discharge events. An analysis of a layer winding, in the time and frequency domains, with these faults shows that current assessment methods must be used with caution. A model reference approach is proposed to distinctly improve recognition in such cases. The method is immune to changes of wave shape and the instant of fault is available by observation.

35 citations


"Simulation of faults during impulse..." refers background in this paper

  • ...Results of faults during chopped impulse test are described in [2]....

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Journal ArticleDOI
E. Hanique1
TL;DR: It is proved that the transfer functions of a sequence of impulse tests with the same test circuit can be compared with each other and the differences found are mostly due to hardware and software which is not suitable for the determination of the transfer function.
Abstract: A new diagnostic tool available with digitally recorded waveforms for lightning impulse tests on a transformer is the so called transfer function. For the calculation of the transfer function, two waveforms are recorded. The first waveform is the impulse voltage and the second waveform is the impulse current. Both waveforms recorded in the time-domain are transformed to the frequency-domain and the transfer function is calculated. This paper proves that the transfer functions of a sequence of impulse tests with the same test circuit can be compared with each other. In the author's opinion, the differences found between transfer functions are mostly due to hardware and software which is not suitable for the determination of the transfer function. A statement about reliability is only possible if the technology used for determination of the transfer function is beyond any doubt. This paper compares the transfer functions of the full impulse waveform and the chopped impulse waveform on the same terminal of the transformer and test circuit, which is the worst case condition for the comparison, to prove that comparison of transfer functions is possible. >

23 citations


"Simulation of faults during impulse..." refers background in this paper

  • ...One of the main difficulties in devising analysis methods for identification of PD during impulse tests is the lack of specific data for such events [1] and the lack of controlled experiments....

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