Characteristics of partial discharges pulse trains in an artificially-simulated tree channel in solid insulating material

Hiroshi Kaneiwa; Yasuo Suzuoki; Teruyoshi Mizutani

doi:10.1541/ieejfms1990.119.7_1051

Hiroshi Kaneiwa, Yasuo Suzuoki, Teruyoshi Mizutani

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1999 Volume 119 Issue 7 Pages 1051-1058

DOI https://doi.org/10.1541/ieejfms1990.119.7_1051

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Published: July 01, 1999 Received: December 18, 1998 Available on J-STAGE: July 15, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 15, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

In attempt to clarify the electrical treeing degradation, we investigated the characteristics of partial discharge (PD) by utilizing φ-q-n patterns and PD pulse sequences from an artificially-simulated tree channel within low-density polyethylene. At most one PD pulse occurred in half cycle in our experimental condition. PD's appeared in several consecutive cycles and then ceased for several cycles, forming PD pulse trains with discharge free intervals. There existed a strong correlation between positive and negative PD pulses occurring in two consecutive half cycles. These results are explained by trapped charges on channel wall due to the preceding PD. The PD pulse trains tended to end with a positive PD pulse. It is explained in terms of the suppression of a negative PD pulse due to the field reduction by the negative space charge near the needle tip. It is useful to investigate characteristics of PD's in an artificial channel in order to clarify PD characteristics in an actual tree channel.

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