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Analysis of acoustic and electromagnetic emission of traction transformers

Kučera Matej, Brncal Peter, Cefer Viktor, Jarina Roman, Gutten Miroslav

Przegląd Elektrotechniczny

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2021

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R. 97, nr 5

107--110

EN

The article analyzes the diagnostics of a high-voltage power transformer by means of an acoustic camera. It is one of the basic diagnostics and monitoring of remote measurement and analysis of acoustic emission. The high-voltage power transformer generates acoustic emission, thanks to which we can analyze the operating and fault states of the device. The article shows the use of the acoustic camera for operational monitoring and diagnostics of its life through noise from the source of the transformer winding and the ferromagnetic core. We performed measurements of acoustic emission on the traction transformers with parameters 5 MVA, 25/6 kV and 25 MVA, 110/3 kV that were in real operation. We studied the spatial distribution of the acoustical field as well as its spectra. Preliminary results have shown that acoustic analysis may be a useful alternative option for high-power transformer’s health condition.

PL

W artykule przeanalizowano diagnostykę transformatora mocy wysokiego napięcia za pomocą kamery akustycznej. Jest to jedna z podstawowych metod diagnostyki i monitoringu zdalnego z wykorzystaniem emisji akustycznej. Transformator mocy wysokiego napięcia generuje emisję akustyczną, dzięki której możemy analizować stany pracy i uszkodzenia urządzenia. W artykule przedstawiono zastosowanie kamery akustycznej do monitorowania eksploatacyjnego i diagnostyki poprzez szum pochodzący ze źródła uzwojenia transformatora i rdzenia ferromagnetycznego. Wykonaliśmy pomiary emisji akustycznej transformatorów trakcyjnych o parametrach 5 MVA, 25/6 kV i 25 MVA, 110/3 kV, które były w rzeczywistej eksploatacji.

2

Diagnostics of transformer insulation by frequency domain spectroscopy

Gutten Miroslav, Korenciak Daniel, Brncal Peter, Cefer Viktor

Przegląd Elektrotechniczny

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2020

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R. 96, nr 8

43--46

EN

The paper deals with the diagnostics of insulation oil-paper in high-voltage transformers by frequency diagnostic spectroscopy. The first part of paper deals with the base information about diagnostics of power transformers. In this part are presented differently insulating methods, for example method of recovery voltage method (RVM), method of polarization and depolarization currents (PDC) and chromatographic analysis. The second part of paper deals use of method of frequency domain spectroscopy (FDS) for high-voltage transformers with insulation oil-paper. This method is used in analysis insulating condition of power transformer with system of oil-paper. It was found, that the results of these tests are highly impacted by the operating temperature during the experimental measurement. Moisture and conductivity between insulating paper and oil in an insulating system are highly dependent from temperature. In the other part, the paper presents experimental results of the frequency diagnostic measurement for a real single-phase high-voltage transformer at different operating temperatures and states (with oil and without). Finally in the last part, the paper presents comparing frequency insulating measurements among several the same single-phase high-voltage transformers.

PL

W artykule przedstawiono metody diagnostyki izolacji olejowo-papierowej w transformatorach wysokiego napięcia. Zastosowano metodę spektroskopii częstotliwościowej. Wyniki analizy znacząco zależały od temperatury pracy. Porównano wyniki dla różnych warunków pracy kilku transformatorów.

3

Analysis of insulating parameters of oil transformer by time and frequency methods

Gutten Miroslav, Kucera Matej, Brncal Peter, Sebok Milan, Korenciak Daniel

Diagnostyka

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2020

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Vol. 21, No. 4

51--56

EN

In the paper is presented experimental analysis and diagnostics of insulating system oil-paper for power transformers. In the first part of the paper is described base theory about measurement and diagnostics insulating part (oil and paper) of transformers. In the other two parts of the paper is presented experimental results of the diagnostic measurement for the transformer 22/0.4 kV at constant temperature. Specifically, in the second part is described measuring time method of insulating diagnostics - return voltage measurement (RVM). This method is used for analysis of condition of paper moisture of high-voltage equipment. In the third part is described measuring method of insulating frequency diagnostics - frequency domain spectroscopy (FDS). This method is used for analysis insulating condition of high-voltage equipment with insulating oil-paper. The both measuring methods are unique in terms of analysis of insulating system of oil power transformers. In comparison with other methods, the RVM and FDS methods it is possible comparison and evaluate the moisture state of the dielectric paper of the power transformer with high reliability and accurate. Their reliability in determining moisture in paper was shown by determining the same result (3.5%) on the same measured transformer.