Journal ArticleDOI
Piezoelectric reflecting transducer for partial discharge acoustic signals
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TLDR
In this article, a piezoelectric transducer for acoustic signals emitted during partial discharges in power transformers is presented, and the metrological parameters are tested.Abstract:
The paper presents a new design for a piezoelectric transducer for acoustic signals emitted during partial discharges in power transformers. Testing results of its metrological parameters are presented. Examples of partial discharge oscillograms recorded using the new transducer in the measuring path are shown.read more
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Patent
Echographic technique-based method and apparatus to detect structure and anomalies of the subsoil and/or sea bottom and the like
TL;DR: In this paper, an echographic technique based method for prospecting of the subsoil or sea bottom and the like, by means of acoustic waves and carried out by the use of an apparatus constitued, in combination of a known acoustic wave transmitting equipment, comprising of a body (6, 8) in the inside of which a chamber (9) is formed defined by an internal reflecting surface (7) shaped like a round paraboloid of axis (Y--Y), closed at the base by an elastic diaphragm (5) and filled with a proper
New technique：Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design
Ching-chau,Su,Jiann-fuh,Chen +3 more
TL;DR: Practical test results show that the new techniques can be used to locate precisely the PD in HV windings and improve sensitivity but also increases the reliability of the measurement system.
Journal ArticleDOI
Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design
TL;DR: In this paper, two techniques were developed to alleviate the shortcomings of the acoustic emission (AE) method for detecting and locating partial discharges (PD) in cast-resin dry-type transformers.
Proceedings ArticleDOI
New designed wideband amplifier and waveguide for partial discharge location in cast-resin dry-type transformer
TL;DR: In this article, a new designed acoustic emission (AE) wideband amplifier and waveguide are used to locate the partial discharge (PD) signal in cast-resin dry-type transformer.
Journal ArticleDOI
Calibration of piezoelectric transducers for electric discharge acoustic signals
TL;DR: In this paper, a system for piezoelectric transducers calibration in units of electric charge of discharges is presented, based on a unidirectional acoustic field model.
References
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ReportDOI
Underwater Electroacoustic Measurements
TL;DR: In this paper, the electrical and acoustical measurements described in this book are those required to calibrate, test, or evaluate an underwater electroacoustic transducer and to enable one, indirectly, to produce or detect and measure an underwater acoustic signal, usually in terms of its acoustic pressure.
Journal ArticleDOI
The Relationship Between Ultrasonic and Electrical Measurements of Under-Oil Corona Sources
TL;DR: In this article, the relationship between electrical and ultrasonic values of different transformer coronas within an unobstructed oil environment was investigated in which typical corona sources, ranging in value from ~5-~105 pC, were energized within an oil-filled transparent tank and the ultrasonic emissions recorded via a transducer on the tank outer wall.