Effect of carbonized patterns on oil-impregnated aramid pressboards surface on acoustic emission signals at inhomogeneous electric field

verfasst von
S. A.M. Najafi, Ernst Gockenbach, Peter Werle, H. Borsi
Abstract

The acoustic emission signals produced by discharges of a point-plane electrode on the surface (surface discharge) of different oil-impregnated aramid pressboards are detected by a 150 kHz acoustic emission sensor mounted on the outside of the experimental tank sample. Numbers, maximum amplitudes and average amplitudes of acoustic bursts are measured via a digital signal processor device and evaluated. The effect of transition mechanism from spark to pseudoglow discharge on acoustic emission signals at different voltages is examined. The tracking patterns on the surface of four different aramid pressboard insulations are compared together by using Matlab image processing program. By experimental results, tracking patterns on the surface of the bulk impregnated pressboard insulation have a significant effect on the acoustic emission signals. Acoustic emission signals amplitudes decrease dramatically on damaged pressboards and cause so called silent PDs.

Organisationseinheit(en)
Fachgebiet Hochspannungstechnik und Asset Management (Schering-Institut)
Institut für Elektrische Energiesysteme
Externe Organisation(en)
Senvion Deutschland GmbH
Typ
Artikel
Journal
IEEE Transactions on Dielectrics and Electrical Insulation
Band
25
Seiten
1644-1650
Anzahl der Seiten
7
ISSN
1070-9878
Publikationsdatum
10.2018
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Elektrotechnik und Elektronik
Elektronische Version(en)
https://doi.org/10.1109/TDEI.2018.006939 (Zugang: Geschlossen)