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Energies 2017, 10(7), 938; https://doi.org/10.3390/en10070938

Influence of Copper Particles on Breakdown Voltage and Frequency-Dependent Dielectric Property of Vegetable Insulating Oil

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
2
Guangzhou Power Supply Co. Ltd., Guangzhou 510000, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Issouf Fofana
Received: 26 May 2017 / Revised: 24 June 2017 / Accepted: 4 July 2017 / Published: 6 July 2017
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Abstract

The insulating performance of oil is vulnerable to particles especially the conductive particles. This paper investigated the influence of copper particles of micrometer size on the breakdown strength and frequency-dependent properties of vegetable oil. The AC breakdown voltage of contaminated vegetable oil with copper particles of different numbers (ranging from 103 to 106) was measured. The frequency-dependent dielectric properties including volume resistivity, relative permittivity and dissipation factor of the contaminated vegetable oil with copper particles of various volumetric concentrations (0.011%, 0.056% and 0.112%) were measured. Identical experiments were conducted with mineral oil for comparison. Results show that the AC breakdown voltage of vegetable oil decreases with the increase of copper particle concentration. The mineral oil exhibits a similar trend, but the influence of copper particles on the AC breakdown voltage of vegetable oil is less significant than that on mineral oil because of its greater viscosity. The relative permittivity and dissipation factor increase with increasing copper volumetric concentration while the volume resistivity decreases. The influence of copper particles on them is significant at low frequencies and this influence becomes inconspicuous as the frequency increases. Similar results were observed for mineral oil. View Full-Text
Keywords: vegetable insulating oil; breakdown voltage; volume resistivity; relative permittivity; dissipation factor; copper particles vegetable insulating oil; breakdown voltage; volume resistivity; relative permittivity; dissipation factor; copper particles
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Zhang, J.; Wang, F.; Li, J.; Ran, H.; Huang, D. Influence of Copper Particles on Breakdown Voltage and Frequency-Dependent Dielectric Property of Vegetable Insulating Oil. Energies 2017, 10, 938.

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