Results 161 to 170 of about 161,473 (191)

Partial Discharge Measurement

2014
This chapter is devoted to the measurement of partial discharges (PD) localized in weak spots of dielectrics if subjected to high test voltages. As standards for PD measurement s have been introduced only for quality assurance tests of HV apparatus energized by power frequency AC voltages (50/60 Hz), the following treatment refers mainly to this test ...
Wolfgang Hauschild, Eberhard Lemke
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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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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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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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Radiometric partial discharge detection

2008 International Conference on Condition Monitoring and Diagnosis, 2008
Radio frequency (RF) detection of partial discharges (PD) is a long-established principle, being described in the international standard for partial discharge measurement. The growing market for mobile communication devices in recent years has led to big reductions in the cost of electronic hardware operating in the VHF and UHF bands, making advanced ...
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Chopped partial discharge sequence

IEEE Transactions on Dielectrics and Electrical Insulation, 2015
In order to investigate partial discharge behavior, its mechanism and dynamics, a novel methodology – chopped partial discharges – has been elaborated. Typically, either during laboratory measurements or at on-site field testing, partial discharges are detected by applying a continuous sinusoidal excitation, most regularly 50/60 Hz or other frequency ...
Marek Florkowski, Barbara Florkowska, Pawel Zydron   +2 more
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Electric conduction breakdown and partial discharges in dielectric fluids. I. Partial discharges

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials, 2002
Some studies have suggested that there may exist a relationship between conduction and electrical breakdown. Before such a correlation between these phenomena and partial discharges (PDs) can be investigated, it is necessary to produce reproducible PD data.
MAZZETTI DI PIETRALATA, Carlo, POMPILI, Massimo, E. O. Forster   +2 more
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Partial discharge location in power transformers

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 Discharges Waveshape Characterisation

2004
Power transformers have a significantly more complex insulation structure than other types of power devices. The economic penalties incurred by transformer failure, and the resulting outage cost, are considerable.
M. A. Elborki, Z. D. Wang, P. A. Crossley   +2 more
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Propagation of partial discharge signals and the location of partial discharge occurrences

2013 IEEE 8th International Conference on Industrial and Information Systems, 2013
The location of the partial discharge source in transformer insulation was analysed by simulation studies. The partial discharge source was modelled such that it radiates the Ultra High Frequency (UHF) signal. It was observed that there exists a time difference of arrival of the UHF signal at the sensors based on its distance from the location of the ...
R. Sarathi, I. P. Merin Sheema, V. Subramanian   +2 more
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