Next Article in Journal
Experimental Determination of the Influence of Shape on the Heat Transfer Process in a Crushed Granite Storage Bed
Next Article in Special Issue
Statistical Analysis of AC Dielectric Strength of Natural Ester-Based ZnO Nanofluids
Previous Article in Journal
Cell-Set Modelling for a Microtab Implementation on a DU91W(2)250 Airfoil
Previous Article in Special Issue
A Review on Synthetic Ester Liquids for Transformer Applications
Article

Ageing Tests of Samples of Glass-Epoxy Core Rods in Composite Insulators Subjected to High Direct Current (DC) Voltage in a Thermal Chamber

1
Department of Electrical Engineering Fundamentals, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
2
Department of Experimental Mechanics, Institute of Fundamental Technological Research Polish Academy of Sciences, 02-106 Warsaw, Poland
3
Environmental Impact and Overvoltage Protection Laboratory, Institute of Power Engineering-Research Institute, 01-330 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Energies 2020, 13(24), 6724; https://doi.org/10.3390/en13246724
Received: 1 November 2020 / Revised: 7 December 2020 / Accepted: 16 December 2020 / Published: 20 December 2020
(This article belongs to the Special Issue High Voltage Insulating Materials-Current State and Prospects)
In this article, we presented the results of the tests performed on three sets of samples of glass-reinforced epoxy (GRE) core rods used in alternating current (AC) composite insulators with silicone rubber housing. The objective of this examination was to test the aging resistance of the rod material when exposed to direct current (DC) high voltage. We hypothesized that the long-term effects of the electrostatic field on the GRE core rod material would lead to a gradual degradation of its mechanical properties caused by ionic current flow. Further, we hypothesized that reducing the mechanical strength of the GRE core rod would lead to the breakage of the insulator. The first group of samples was used for reference. The samples from the second group were subjected to a temperature of about 50 °C for 6000 h. The third group of samples were aged by temperature and DC high voltage for the same time. The samples were examined using the 3-point bending test, micro-hardness measurement and microscopic analysis. No recordable degradation effects were found. Long-term temperature impact and, above all, the combined action of temperature and DC high voltage did not reduce the mechanical parameters or change the microstructure of the GRE material. View Full-Text
Keywords: DC high voltage; composite insulator; glass-reinforced epoxy core; 3-point bending test; mechanical strength; micro-hardness DC high voltage; composite insulator; glass-reinforced epoxy core; 3-point bending test; mechanical strength; micro-hardness
Show Figures

Figure 1

MDPI and ACS Style

Wieczorek, K.; Ranachowski, P.; Ranachowski, Z.; Papliński, P. Ageing Tests of Samples of Glass-Epoxy Core Rods in Composite Insulators Subjected to High Direct Current (DC) Voltage in a Thermal Chamber. Energies 2020, 13, 6724. https://doi.org/10.3390/en13246724

AMA Style

Wieczorek K, Ranachowski P, Ranachowski Z, Papliński P. Ageing Tests of Samples of Glass-Epoxy Core Rods in Composite Insulators Subjected to High Direct Current (DC) Voltage in a Thermal Chamber. Energies. 2020; 13(24):6724. https://doi.org/10.3390/en13246724

Chicago/Turabian Style

Wieczorek, Krzysztof, Przemysław Ranachowski, Zbigniew Ranachowski, and Piotr Papliński. 2020. "Ageing Tests of Samples of Glass-Epoxy Core Rods in Composite Insulators Subjected to High Direct Current (DC) Voltage in a Thermal Chamber" Energies 13, no. 24: 6724. https://doi.org/10.3390/en13246724

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop