NDLI: A new method for the evaluation and recognition of corona under direct voltage stress

Content Provider	IEEE Xplore Digital Library
Author	Dezenzo, T. Betz, T. Schwarzbacher, A.T.
Copyright Year	2015
Description	Author affiliation: Univ. of Appl. Sci., Darmstadt, Germany (Dezenzo, T.; Betz, T.) \|\| Dublin Inst. of Technol., Dublin, Ireland (Schwarzbacher, A.T.)
Abstract	A new method for the analysis of partial discharges (PD), which are used as an indicator for insulation quality in electrical apparatuses, is evaluated for corona discharges at DC voltage. This method targets pattern generation for DC PD similar to the well-known AC PD diagnostic method called phase-resolved partial discharge (PRPD) representation. For DC voltage the important phase relation is missing. Therefore, the missing phase relation for DC PD is made by superimposing a repeating sequence onto the DC voltage. In this paper the DC voltage is obtained via half wave rectification of a 50 Hz AC voltage. Thus, if the circuit is not being properly smoothed or is resistively loaded a voltage ripple repeating at 50 Hz will be present on the DC voltage which is then used to obtain phase relation. Several tests with different amounts of ripple are presented. The results show that a pattern generation for DC corona via the superimposing of a repeating sequence in that case a 50 Hz voltage ripple is possible. Furthermore, the patterns can be and are explained in terms of the physical discharge behavior. Finally, it is shown that a small enough ripple does not change the general discharge behavior of the corona source.
Starting Page	1
Ending Page	6
File Size	7178060
Page Count	6
File Format	PDF
ISBN	9781467369749
DOI	10.1109/ISSC.2015.7163750
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-24
Publisher Place	Ireland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Partial discharges Prpd Voltage measurement Partial discharge Frequency-domain analysis Capacitors Needles Ripple Discharges (electric) Corona DC
Content Type	Text
Resource Type	Article

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