Title :
A comparative study of partial discharges under power and very low frequency voltage excitation
Author :
Thinh Dao ; Phung, B.T. ; Blackburn, Trevor ; Nguyen, H.V.P.
Author_Institution :
Univ. of New South Wales, Sydney, NSW, Australia
Abstract :
Very low frequency (VLF) testing refers to AC testing in the frequency range of 0.01 Hz up to 1 Hz. VLF testing is increasingly becoming popular as an alternative approach for test objects which require significant reactive power such as power cables. However, reliable diagnosis of partial discharge characteristics under VLF voltage excitation is still lacking. The paper presents a comparative study between testing at normal power frequency and at VLF. Corona and surface discharges were produced using a needle/bowl and a short section of 11kV XLPE cable. Experiments were conducted over a range of frequencies from 50 Hz down to 0.08 Hz and the results were analyzed. They showed some similarity of PD characteristics in terms of their phase-resolved patterns. The discrepancies of PD results are described in details.
Keywords :
XLPE insulation; corona; insulation testing; partial discharges; power cable insulation; AC testing; PD characteristics; VLF testing; XLPE cable; corona; partial discharges; phase-resolved patterns; surface discharges; very low frequency testing; very low frequency voltage excitation; Corona; Discharges (electric); Frequency measurement; Needles; Partial discharges; Power cables; Testing; cables; partial discharge; very low frequency;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2014 IEEE Conference on
Conference_Location :
Des Moines, IA
DOI :
10.1109/CEIDP.2014.6995861
