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The analysis of the acoustic emission signals generated by multisource partial discharges

Boczar T., Borucki S., Cichoń A.

Molecular and Quantum Acoustics

2008

Vol. 29

11-20

The paper presents research work results aiming at determining the possibilities of recognizing defects of paper-oil insulation systems based on the registered acoustic emission (AE) signals generated by multisource partial discharges (PDs) of various types. The investigations were carried out in a model system in which multisource electrical discharges were generated with two modeling spark-gaps: one spark-gap in the surface system and the other in the multipoint-plane system. The aim of the research carried out was to confirm the suitability of the AE method for diagnosing the insulation condition of high-voltage power appliances, in which multisource PDs may occur. The signal analysis was carried out in the frequency and time-frequency domains. The paper presents a comparative analysis of the AE signals registered from the point of view of the identification possibilities of the particular PD types.

Influence of the oil layer thickness on suppression of higher frequencies of the acoustic emission signals generated by partial discharges

Borucki S., Boczar T., Cichoń A., Lorenc M.

Molecular and Quantum Acoustics

2008

Vol. 29

21-26

The subject matter of this paper refers to the assessment of the influence of the oil layer thickness on suppression of the acoustic emission (AE) signals generated by partial discharges (PDs) developing in paper-oil insulation of power appliances. The paper presents laboratory research results referring to the analysis of suppression of the AE signals frequency band depending on the thickness of AE pulses (oil layer) propagation channel. The measurements of the AE signals generated by SPDs were taken with two wide-band hydrophones type TC4038 by Reson company. One of the hydrophones was placed close to the PD source and the other measuring sensor was shifted along the transformer tub model.

To describe the contribution of interface factor on acoustical emission in solids

Burak Y., Nahirnyj T.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2002

z. 60 [197]

67-75

The approach to describe the contribution of interface phenomena on acoustical emission in solids is proposed. It is based on the mathematical model of locally gradient solids which take into account the interface nonhomogeneity of interaction energy. On the model problems the regularity of dynamical behavior owing to the new arisen boundary is study.