Partial Discharges Measured with an Automated System in Epoxy Resin and Polyethylene

authored by

U. Bammert, Manfred Beyer

Abstract

The partial discharge (PD) characteristics of a filled epoxy casting resin where compared in long-term tests with those of polyethylene (PE). For this purpose, a newly developed automatic measuring system was used to detect and process PD parameters such as the apparent amount of charge, the PD repetition rate, the apparent PD energy and the polarity of the impulses, together with the position of the latter with respect to the phase of the applied 50 Hz ac voltage. The measurements were made on needle-plate model specimens. The results recorded over long stress periods at constant voltage show that the PD impulses in epoxy resins arise discontinuously and with constantly changing amplitude. “Impulse pauses” lasting several hours were recorded in these materials. PE was found to differ fundamentally from epoxy resins in their PD characteristics. In this material, the PD impulses occurred fairly regularly and were of almost constant amplitude. As a result of the very high impulse frequency in PE over the whole period of measurement, breakdown development is relatively rapid. Interpretation of the results is based on the concept of the origin of PD channels in the extremely inhomogeneous ac field, particular use being made of the recorded phase histograms recorded and of the changes observed in the apparent PD energy with time.

Organisation(s)

High Voltage Engineering and Asset Management Section (Schering Institute)

Type

Article

Journal

IEEE Transactions on Electrical Insulation

Volume

23

Pages

215-225

No. of pages

11

ISSN

0018-9367

Publication date

04.1988

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Engineering(all), Electrical and Electronic Engineering

Electronic version(s)

https://doi.org/10.1109/14.2357 (Access: Closed)