@inproceedings{01535e45e6e64caba9dbc2e6087760c0,
title = "Microstructure observation of zinc oxide exposed to thermal and ac field stresses",
abstract = "In this work, ac field and thermal stresses of magnitude and duration 0.76 V1mA/85°C/48 hours is used to implement accelerated degradation on commercially-sourced Zinc oxide (ZnO) varistors. The following parameters are measured and analysed before and after degradation test: the average size of ZnO grains using linear intercept method on Scanning Electron Microscopy (SEM) micrograps, microstructure phase composition using X-ray diffractometer (XRD) and Energy Dispersion Spectroscopy (EDS) techniques, and (V - I) characteristic curve using the Keithley 2401 source-meter. The degradation rate and the non-linear coefficient of the tested samples are derived from the (V - I) characteristic. The results obtained indicate an increase of ZnO grain average size from 5.7749 μm to 6.8753 μm, a decrease from 23.6 to 16.1 of the coefficient of non-linearity and a higher degradation rate of 32.6923 μAh-1/2 for degraded or failed varistor samples.",
keywords = "Accelerated degradation, Microstructure, SEM, V - I characteristic, ZnO surge arresters",
author = "P. Mabonda and P. Bokoro",
note = "Publisher Copyright: {\textcopyright} 2017 IEEE.; 17th IEEE International Conference on Environment and Electrical Engineering and 2017 1st IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2017 ; Conference date: 06-06-2017 Through 09-06-2017",
year = "2017",
month = jul,
day = "12",
doi = "10.1109/EEEIC.2017.7977653",
language = "English",
series = "Conference Proceedings - 2017 17th IEEE International Conference on Environment and Electrical Engineering and 2017 1st IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2017",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "Conference Proceedings - 2017 17th IEEE International Conference on Environment and Electrical Engineering and 2017 1st IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2017",
address = "United States",
}