Abstract
The results obtained for the measurements of acoustic emission (AE) signal parameters emitted in three dielectric liquids are presented in this paper. In particular, the velocity of AE wave was calculated based on the time of arrival of the AE signal. A frequency modulated signal was generated by a piezoelectric transducer and measured at various distances by a hydrophone. The changes in velocity values at particular distances and for different frequencies were investigated. The analyses include the determination of the dependency of the velocity values from the distance between the communicating devices. A nonlinear regression model was calculated, and the differences between AE velocities propagating in the considered dielectrics were determined. Similarly, the influence of modulation frequency on the AE velocity was determined using nonlinear regression. Based on the calculation data, it can clearly be stated that the velocity of AE wave depends significantly on the frequency and distance at which it is registered. These two factors may have an important influence on the localization of partial discharges (PD) occurring in these types of dielectric liquids.
Highlights
Acoustic emission (AE) is one of the noninvasive methods used for the detection and localization of partial discharges (PD), occurring in the insulation systems of power transformers [1,2,3]
The speed of AE wave has an important impact on the localization result, as shown in [18], where authors measured AE velocity changes at various distances while propagating in concrete
The AE wave will undergo additional phenomena such measurements conducted in this a laboratory
Summary
Acoustic emission (AE) is one of the noninvasive methods used for the detection and localization of partial discharges (PD), occurring in the insulation systems of power transformers [1,2,3]. The speed of AE wave has an important impact on the localization result, as shown in [18], where authors measured AE velocity changes at various distances while propagating in concrete. In this study, experiments have been carried out to determine the AE wave velocity in the chosen propagation centers. The AE velocity at different distances between the source and receiver was determined. The main contribution of the here presented research study lies in the determination of the influence distance and modulation frequency spectrum. AreEN usually in size, types of dielectrics particular, mineral oilTransformers type TRAFO [23], large natural ester type but the distance from the isolation system to the sensor can be up to several meters long. The distances considered in this study were chosen experimentally, as
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