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Article
Author(s)
Ryoichi Hanaoka1, Katsunori Miyagi1, Yoji Fujita1, Kiyoshi Takamoto2, Seiichi Nishikawa2 and Yoshiyuki Oura2
Full-Text PDF XML 470 Views
DOI:10.17265/1934-8975/2018.07.003
Affiliation(s)
1. Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
2. Kanden Engineering Corporation, 3-1-176 Fukuzaki, Minato-ku, Osaka 552-0013, Japan
ABSTRACT
This
paper presents an experimental study on the creeping discharge propagating over
the pressboard surface in two vegetable oils (PFAE (palm fatty acid ester) oil
and CRS (crude rapeseed) oil) and commercial mineral oil under the quasi-square
impulse voltage with any pulse width. The pressboard impregnated with the
sample oil is immersed completely into the same oil. The tungsten needle
electrode is installed in the pressboard surface with and without the counter
electrode to generate a creeping discharge. The other side of pressboard has
the thin copper rod as a back side electrode. A comparison of the shape and
stopping length of positive and negative streamers, discharge current, emitted
light signal, and temporal variation and velocity of streamer propagation is
reported for all different oil-pressboard interfaces. It has been shown that
the behavior of creeping streamers has unique characteristics and polarity effects, and the traveling mode and propagation velocity of streamers are greatly
different depending on the type of oil.
KEYWORDS
Creeping streamer, stopping length, propagation velocity, quasi-square impulse voltage, PFAE oil, CRS oil, mineral oil.
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