Results 101 to 110 of about 1,299 (162)

Lightning Impulse Current Generator with Superposition Function

open access: yesThe Journal of the Institute of Electrical Installation Engineers of Japan, 2011
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Evaluation of breakdown characteristics of gas insulated switchgears for non-standard lightning impulse waveforms - method for converting non-standard lightning impulse waveforms into standard lightning impulse waveforms -

IEEE Transactions on Dielectrics and Electrical Insulation, 2009
To lower the lightning impulse withstand voltage of gas insulated switchgear (GIS) while maintaining the high reliability of its insulation performance, it is important to define in an organized way the insulation characteristics for non-standard lightning impulse voltage waveforms that represent actual surge waveforms in the field and compare them ...
Genyo Ueta
exaly   +2 more sources

Evaluation of breakdown characteristics of oil-immersed transformers under non-standard lightning impulse waveforms - method for converting non-standard lightning impulse waveforms into standard lightning impulse waveforms

IEEE Transactions on Dielectrics and Electrical Insulation, 2008
To lower the insulation specifications (specifically, the lightning impulse withstand voltage) of oil-immersed transformers and thus reduce equipment cost while maintaining high insulation reliability, it is required to identify the insulation characteristics under non-standard lightning impulse waveforms that are associated with actual surge waveforms
Jun Takami
exaly   +2 more sources

High-Accuracy Comparison of Lightning and Switching Impulse Calibrators

IEEE Transactions on Instrumentation and Measurement, 2007
This paper summarizes the results of a comparison on two calculable impulse voltage calibrators and one commercial calibrator between Helsinki University of Technology, Finland (MIKES-TKK), Nippon Institute of Technology, Japan (NIT), and Physikalisch-Technische Bundesanstalt, Germany (PTB).
Wakimoto, Takayuki   +7 more
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Robust evaluation procedure for lightning impulses

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417), 2004
The existing recommendation for high voltage tests, IEC Publication 60060, is ambiguous in the evaluation of the impulse test voltage, when oscillations or overshoot are superimposed on the peak of the smooth, double exponential waveshape. Particularly impulse tests on transformers may be critical due to the high stress on the insulation during the ...
K. Hackemack, E. Gockenbach
openaire   +1 more source

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