Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/40431
Title: Are Nano-composites really better DC Insulators? A study using silica nanoparticles in XLPE
Authors: Lei, Weiqun
Wu, Kai
Wang, Ya
Cheng, Yonghong
Zheng, Xiaoquan
Dissado, L. A.
Dodd, S. J.
Chalashkanov, N. M.
Fothergill, Chong
Zhang, Wenpeng
Li
First Published: 13-Sep-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: IEEE Transactions on Dielectrics and Electrical Insulation, 2017, 24 (4), pp. 2268-2270
Abstract: A DC step test and a number of DC life endurance tests have been performed at a temperature of 20°C on 200 μm thick samples of a commercial (AC grade) XLPE and its nanocomposite which is intended for DC use. It was found that the breakdown strength of the nano-composite on the DC step test was considerably larger than that of the unfilled XLPE. However, the endurance tests showed that the difference between the characteristic lifetime of the nano-composite and its unfilled base polymer reduced as the applied field was reduced and the lifetimes became essentially the same when the applied field was 130 kV/mm, which is the lowest for which we have data at present. The life line was analyzed as an inverse power law and gave median life exponents of n = 10.76 for the nano-composite and n = 13.58 for the XLPE. These values are consistent with estimates from step tests on the same materials that have been recently published, and imply that the nano-composite will perform worse than the AC grade XLPE as a DC insulator if the inverse power law continues to be obeyed down to service fields.
DOI Link: 10.1109/TDEI.2017.006613
ISSN: 1070-9878
Links: http://ieeexplore.ieee.org/document/8035400/
http://hdl.handle.net/2381/40431
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © IEEE, 2017. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Engineering

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