Abstract
The corona characteristics of the single and bundle conductors are investigated experimentally under negative damped oscillation impulses. The experimental setup consisting of a modified impulse generator, corona cage and digital measurement system is built for measuring the charge–voltage (q‐u) curves. An exploratory experiment is described with special attention to the effect of the number of bundle conductors on the feature of q‐u curves. The behavior of the minor loops on the q‐u curves is examined from a single‐conductor to four‐conductor bundle. In terms of the measured corona inception voltage, the corona inception field strength is evaluated at a critical distance from the inner electrode. The capacitance increase coefficient and energy dissipated by corona are extracted from the measured q‐u curves. Then, a discussion is also presented on these characteristic indices according to the gas discharge mechanism. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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