Results 261 to 270 of about 30,911 (308)

Partial discharge location in powertransformers

IEE Proceedings - Science, Measurement and Technology, 2000
In a power transformer, high levels of partial discharge activity may lead to an insulation failure. If a partial discharge (PD) could be detected and located before the insulation fails, the transformer could be repaired or replaced before any consumers connected to the transformer lose supply. A technique is described in the paper that can be used to
Wang, Z.D., Crossley, P.A., Cornick, K.J., Zhu, D.H.   +3 more
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Partial discharge. XVII. The early history of partial discharge research

IEEE Electrical Insulation Magazine, 1993
For pt.XVI see ibid., vol.9, no.3, p.21 et seq. (1993). Early investigations into partial discharge (PD) phenomena are reviewed to illustrate how little has changed and how much has, in some respects, been repeated during the forty years from 1940 to 1980.
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Partial discharge diagnostic

Proceedings of the 6th International Conference on Properties and Applications of Dielectric Materials (Cat. No.00CH36347), 2002
The partial discharge (PD) measurement is a very well known possibility to assess the quality of an insulation system. The aim of the PD-diagnostic is the detection of destruction of electrical insulation as a result of electrical stress especially of PD during operation.
M. Muhr, R. Woschitz
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Partial discharge. XIV. Acoustic partial discharge detection-practical application

IEEE Electrical Insulation Magazine, 1992
For pt.XIII see ibid., vol.8, no.4 (July/August 1992). The finer points of acoustic partial discharge (PD) detection systems and their common applications are treated. The PD source, propagation path of the waves, the acoustic sensor, and system noise are described.
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Partial discharge. XIII. Acoustic partial discharge detection-fundamental considerations

IEEE Electrical Insulation Magazine, 1992
An overview of the basic acoustics theory required to understand the finer points of acoustic partial discharge (PD) detection systems is given. PD and acoustic test methods are discussed, and acoustic wave motion, impedance, and intensity are described. Wave propagation and signal absorption, and the velocity of sound are discussed.
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Microsensors for Partial Discharge

2008 International Conference on Advances in Electronics and Micro-electronics, 2008
For longer service life and better reliability of high voltage under stressed parts or of such whole systems, facilities for deep investigation are necessary. Extremely small microsensors which can be integrated during the production inside measured object like high voltage transformers, drivers or high voltage parts of PCB's are, can serve us valued ...
Pavlík Michal, Havlícek Tomas
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Partial discharges. XII. Partial discharge detection in rotating electrical machines

IEEE Electrical Insulation Magazine, 1992
For pt.XI see ibid., vol.8, no.2, p.14 et seq. (1992). Partial discharge (PD) phenomena in the windings of rotating machines are examined. PD measurements on rotating machines, both offline and online, are described. Data acquisition and analysis requirements are briefly considered. >
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A method for calibration of partial discharge calibrators

1998 Conference on Precision Electromagnetic Measurements Digest (Cat. No.98CH36254), 1999
A method for calibration of partial discharge calibrators has been developed based on passive integration of the induced charge. The voltage over a known capacitor is measured by a calibrated digital sampling voltmeter and the charge is calculated as the voltage multiplied by the capacitance.
Ove Gunnarsson, Anders Bergman, Karl-Erik Rydler   +2 more
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Partial discharges in micrometer voids in PTFE

Conference Record of the 1996 IEEE International Symposium on Electrical Insulation, 2002
In this work, a high bandwidth experimental setup is used to measure the inception voltage, the waveform and the apparent charge of partial discharges (PD) in artificial voids in solid insulating materials. The investigations include microvoids, i.e. voids with characteristics dimensions below 100 /spl mu/m. In this paper, the results for PTFE (teflon)
Gaxiola, E.H.R., Wetzer, J.M.
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Dynamical properties of partial-discharge patterns

International Journal of Parallel, Emergent and Distributed Systems, 2017
AbstractIn this paper, Partial Discharge pattern as an indicator of the fault state of insulation systems of medium voltage overhead lines with covered conductors are described, analyzed, and their dynamical properties are researched. Application of data obtained in natural environment with huge variety of noise interferences, affected by various ...
Marek Lampart, Tomás Vantuch, Ivan Zelinka, Stanislav Misák   +3 more
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