Results 161 to 170 of about 3,083 (217)
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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Lightning Impulse Ageing of HDPE [PDF]
, 2009 This work is concerned with the hypothesis that lightning impulses can lead to accelerated ageing of extruded polymeric cables. The behaviour of an insulation material when suffering lightning impulses is different from that for DC or power frequency over-voltages. Shaped HDPE material samples have been manufactured using a mould tool. The samples then
Dao, N L, Lewin, P L, Swingler, S G
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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 ...
Sadayuki Yuasa, Genyo Ueta
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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 ...
Sadayuki Yuasa, Genyo Ueta
exaly +2 more sources
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
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
Lightning Impulse Ageing of HV Cable Insulation [PDF]
, 2009 Lightning impulses can lead to accelerated ageing of extruded cables. Electrical behaviour of a dielectric material when experiencing a lightning impulse is different to that for DC or power frequency applied voltages. Pre-designed shaped HDPE material samples have been manufactured using a mould tool. The samples then have been electrically aged using
Dao, N L, Lewin, P L, Swingler, S G
openaire +1 more source
Effects of Lightning Impulses on the Dielectric Properties of HDPE [PDF]
, 2009 Impulse over-voltages are very common phenomena in electric power systems. Switching impulses are created by switching surges or local faults while lightning impulses are due to lightning strikes to overhead lines. Both impulses can travel as waves in the system, damaging insulation components and equipment.
Dao, N L, Lewin, P L, Swingler, S G
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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), 2004The 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
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Lightning Impulse Tests on Tower Models
IEEE Transactions on Power Apparatus and Systems, 1984Lightning impulse tests on long insulator strings have been carried out in an attempt to determine the impulse strength of tower insulation in the EHV-UHV ranges.
J. R. Fonseca +3 more
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Worldwide Comparison of Lightning Impulse Voltage Measuring Systems at the 400-kV Level
IEEE Transactions on Instrumentation and Measurement, 2007 An international comparison of lightning and switching impulse voltage measuring systems was arranged and coordinated by the Helsinki University of Technology (MIKES-TKK), Espoo, Finland, between 1999 and 2002.
K Schon
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