Title:	Factors affecting the results of electrical insulation diagnostic tests
Authors:	Ďurman, Vladimír
Citation:	Electroscope. 2012, č. 3.
Issue Date:	2012
Publisher:	Západočeská univerzita v Plzni, Fakulta elektrotechnická
Document type:	konferenční příspěvek conferenceObject
URI:	http://147.228.94.30/images/PDF/Rocnik2012/Cislo3_2012/r6c4c8.pdf http://hdl.handle.net/11025/5897
ISSN:	1802-4564
Keywords:	elektrotechnická diagnostika;elektrická izolace;dielektrika
Keywords in different language:	electrotechnical diagnostics;electrical insulation;dielectric
Abstract in different language:	In this paper the influence of some transient phenomena on the results of dielectric measurements is discussed. The investigation is concerned with the region of very low frequencies or the region of very long times. Based on the solution of Maxwell equations three phenomena were analyzed: the effect of incomplete charging on the values of discharging current, the effect of a deform shape of the step voltage at charging and the effect of multiple periods at evaluation of the alternating current measurements. The results of modeling showed, that the minimum charging time for achieving acceptable results at discharging currents responds approximately to the 50 times of the relaxation time constant. The charging voltage at all experiments has to be checked for its individual time constant. An inadequate long time constant disable us to reveal the parameters of the investigating relaxation process. In the frequency domain, especially in the very low frequency range, it is possible to obtain reliable results after application of minimum three periods of the sinusoidal voltage. Except of this, the paper also provides computational bases for estimation of the differences caused by non-ideal conditions at dielectric measurements.
Rights:	© 2012 Electroscope. All rights reserved.
Appears in Collections:	Číslo 3 (2012) Číslo 3 (2012)

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