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Energies 2016, 9(2), 87; doi:10.3390/en9020087

Influence of Fine Metal Particles on Surface Discharge Characteristics of Outdoor Insulators

1
Key Laboratory of Smart Grid of Ministry of Education (Tianjin University), School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
2
Canada Research Chair on Engineering of Power Network Atmospheric Icing (INGIVRE), Université du Québec à Chicoutimi, 555, Boulevard de l'Université, Chicoutimi, QC G7H 2B1, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Enrico Sciubba
Received: 12 December 2015 / Revised: 18 January 2016 / Accepted: 22 January 2016 / Published: 29 January 2016
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Abstract

Focusing on the influence of fine metal particles on the insulation characteristics of outdoor insulators, spherical micrometer-level iron powders were used to represent fine metal particles of different parameters on a polymer insulator specimen surface. Dynamic movement and lift-off behavior of fine particles, as well as the triggered surface discharges under AC voltage were investigated in a uniform electric field under different experimental conditions. The results reveal that the inception, propagation and intensity of surface discharges are significantly affected by the particle parameters, including particle size, amount and distributing characteristic. Based on the measurement of light emission during the flashover process using a high-speed camera, the process of surface discharge to flashover triggered by the fine metal particles were investigated to obtain a relationship between flashover voltage, discharge light intensity and particle parameters. It is suggested that particle size smaller than 28 µm and particle amount more than 40 mg in contact with the non-uniform distribution can cause a significant distortion and intensification of the electric field resulting in a higher risk of surface discharges leading to flashover. Such investigations can enhance the operating reliability of outdoor insulators subjected to these conditions. View Full-Text
Keywords: outdoor insulator; fine metal particles; micrometer-level size; particle amount; surface discharge characteristic; flashover voltage; discharge luminesce outdoor insulator; fine metal particles; micrometer-level size; particle amount; surface discharge characteristic; flashover voltage; discharge luminesce
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, Y.; Xia, B.; Du, B.; Farzaneh, M. Influence of Fine Metal Particles on Surface Discharge Characteristics of Outdoor Insulators. Energies 2016, 9, 87.

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