有哪些信誉好的足球投注网站电路引用Acoustic waveguides for sensing and locating electrical discharges in high voltage power transformers and other apparatus.pdfVIP
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IEEE Transactions on Power Apparatus and Systems, Vol.PAS-98, No.2 March/April 1979 449 ACOUSTIC WAVEGUIDES FOR SENSING AND LOCATING ELECTRICAL DISCHARGES IN HIGH VOLTAGE POWER TRANSFORMERS AND OTHER APPARATUS R. T. Harrold, Member IEEE Westinghouse Research and Development Center Pittsburgh, Pennsylvania 15235 Abstract - For safety and convenience, ultrasonic siting of external sensors, and due to ultrasonic shear corona sensors are mounted on the outer surface of waves traveling in the tank wall, ultrasound from an power transformer tanks, and consequently, can only internal discharge may arrive at the sensor by an in- receive ultrasound from internal electrical discharges direct route and cause inaccurate sonic ranging. after attenuation through the oil and tank wall. In In this paper, the operation of acoustic wave- order to reduce this attenuation and maximize the de- guides is discussed, and it is demonstrated how the tected signal, it was thought that low-loss acoustic waveguides may be applied to transmit ultrasound from waveguides would be helpful as a means to transmit the internal discharges to external sensors, and conse- ultrasonic emissions from internal discharges to an quently, reduce the usual attenuation through the liq- external sensor. To assess the feasibility of this uid and tank wall. Furthermore, it is shown that a idea, the a
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