DocumentCode :
2482549
Title :
Time resolved measurements of x-ray induced partial discharges
Author :
Adili, Sedat ; Herrmann, Lorenz G. ; Franck, Christian M.
Author_Institution :
Power Syst. & High Voltage Labs., ETH Zurich, Zurich, Switzerland
fYear :
2012
fDate :
14-17 Oct. 2012
Firstpage :
125
Lastpage :
128
Abstract :
The initial statistical time lag of partial discharge (PD) measurements was eliminated by using short x-ray pulses (duration 50 ns) for triggering. Phase resolved PD (PRPD) patterns at low electric field levels were recorded. No significant difference between the PRPD patterns after x-ray pulse triggering and naturally incepted PDs was observed. These measurements were performed with self-produced spherical void samples and even voids of 0.5 mm were detected after one x-ray pulse application. It is assumed that the x-ray pulses provide necessary start electrons to start an avalanche. However, in order to study the effect of the x-ray pulse on the triggering and on the discharge mechanism, time resolved PD measurements with an ultra-wideband detection circuit are necessary. In this work, the classical wide-band PD detection circuit was modified and time resolved measurements were performed. Particular emphasis is placed on the effect of the x-ray dose on the first PD pulses, here shown for one void size. Moreover, the temporal development of subsequent discharges after the total decay of the x-ray pulse is studied. To increase the accuracy of the detection, optical measurements of the discharge are synchronously made with a photomultiplier tube.
Keywords :
X-ray effects; partial discharge measurement; photomultipliers; statistical analysis; PD measurements; PRPD patterns; X-ray induced partial discharges; X-ray pulse triggering; avalanche start; classical wide-band PD detection circuit; discharge mechanism; initial statistical time lag; low electric field levels; naturally incepted PD; partial discharge measurements; phase resolved PD; photomultiplier tube; self-produced spherical void samples; short x-ray pulses; size 0.5 mm; start electrons; subsequent discharges temporal development; time resolved PD measurements; time resolved measurements; ultra-wideband detection circuit; x-ray pulse application; Current measurement; Discharges (electric); Electrodes; Partial discharge measurement; Partial discharges; Pulse measurements; Time measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2012 Annual Report Conference on
Conference_Location :
Montreal, QC
ISSN :
0084-9162
Print_ISBN :
978-1-4673-1253-0
Electronic_ISBN :
0084-9162
Type :
conf
DOI :
10.1109/CEIDP.2012.6378737
Filename :
6378737
Link To Document :
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