A Novel Technique for Partial Discharge and Breakdown
Investigation Based on Current Pulse Waveform Analysis
Hitoshi Okubo
EcoTopia Science Institute, Nagoya University.
Furo-cho, Chikusa-ku,
Nagoya 464-8603, Japan
Naoki Hayakawa
Department of Electrical Engineering and Computer Science, Nagoya University.
Furo-cho, Chikusa-ku,
Nagoya 464-8603, Japan
ABSTRACT
A novel technique for partial discharge (PD) measurement and analysis (PD-CPWA:
PD Current Pulse Waveform Analysis) is developed and introduced in this paper. PDCPWA
is expected to be utilized to discuss PD mechanisms and physics in electrical
insulating materials, focusing on the PD current pulse waveform and its time transition
from PD inception to breakdown (BD). In this paper, the concept and principle of PDCPWA
are described, and the applications of PD-CPWA to (1) epoxy spacer samples
under thermal and electric combined stresses in GIS, (2) creepage PD on epoxy spacers
in SF6 gas and (3) liquid nitrogen / polypropylene laminated paper composite insulation
system for high temperature superconducting cables are introduced and discussed.
Index Terms — Electrical insulation, dielectric materials, partial discharges,
breakdown, current measurement, waveform analysis.