Acoustic Energy Shifting in Transformer Oil at Different Temperatures

Wang, Xiaodong; Li, Baoqing; Xiao, Zhihua; Russo, Onofrio; Roman, Harry T.; Chin, Ken K.; Farmer, K.R.

doi:10.1109/tpwrd.2005.844238

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…ν denotes kinematic viscosity of liquid where sound wavesoccur,inour case kinematic viscosity of the transformer oil. It is the ratio of the dynamic viscosity µ to the density of the fluid ρ.Itstrongly depends on temperature of oil, which can be expressed by (4),which is an empiric model equation [22,20],…”

Section: Theoretical Analysis Physical Backgroundmentioning

confidence: 99%

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Thermally Stimulated Acoustic Energy Shift in Transformer Oil

Petráš¹,

Kurimský²,

Balogh³

et al. 2016

Acta Acustica united with Acustica

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In this paper,p artial discharge acoustic emission waveform data collected in high voltage transformer oil are analysed overcertain temperature range. Analytical model and method of thermally stimulated acoustic energy shift calculation is proposed. It allows to uncoverthe effect of acoustic emission energy shift overthe frequency spectra due to the change of fluid temperature. The variations in the receivedacoustic waveform data have been analyzed. Continuous partial dischage generation wasprovided by Böning model. The analytical model has been verified by experimental data analysis. In the field of non-destructive testing of high voltage power devices it provides anew understanding of the temperature role on interpretation of partial discharges generated acoustic emission.

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Section: Theoretical Analysis Physical Backgroundmentioning

confidence: 99%

“…Parameters a and b takev alues 0.097965 and 0.0014588 respectively and are empirically stated for this kinematic viscosity temperature model in [22]. Taking this into consideration we can rewrite equation…”

Section: Theoretical Analysis Physical Backgroundmentioning

confidence: 99%

Thermally Stimulated Acoustic Energy Shift in Transformer Oil

Petráš¹,

Kurimský²,

Balogh³

et al. 2016

Acta Acustica united with Acustica

View full text Add to dashboard Cite

show abstract

“…The complex internal structure and thick shell of electrical equipment simultaneously increase the difficulty of on-site detection by an external PZT. Compared with a PZT, the EFPI ultrasonic sensor is a nonelectric detection method for measuring PD that has good electrical insulation, miniaturization, and high sensitivity [17,18]. We use an EFPI sensor to build a planar array for detecting a PD ultrasonic signal in oil.…”

Section: Introductionmentioning

confidence: 99%

A Novel EFPI Sensor for Ultrasonic Testing of Partial-Discharge in High-Voltage Electrical Equipment

Wang

Gao²,

Chen

et al. 2021

IEEE Access

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A novel extrinsic Fabry-Perot interferometric (EFPI) ultrasonic sensor is developed that can detect ultrasonic signals of partial discharge (PD) in high-voltage electrical equipment under different temperature and pressure conditions. The unique structure of the novel sensor is able to balance the pressure difference between the two sides of the quartz diaphragm driven by the temperature and the density of the insulating medium, and the inner surface of the quartz diaphragm and the end face of the optical fiber in the sensor are coated, thus considerably improving the sensor sensitivity. Experiments are performed on the novel sensor at different temperatures and measurement distances, and the results verify the temperature, frequency, sensitivity and other types of detection performance, showing that the proposed sensor provides a novel means for detecting partial discharge of high-voltage electrical equipment.

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