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Investigation of surface charges on polymeric insulators and the influence of sessile water droplets

Löwe, Jens-Michael and Secklehner, Maximilian and Hinrichsen, Volker (2017):
Investigation of surface charges on polymeric insulators and the influence of sessile water droplets.
In: INSUCON 2017, 13th International Electrical Insulation Conference 2017, Birmingham, Großbritannien, 16.05.-18.05.2017, DOI: 10.23919/INSUCON.2017.8097170,
[Online-Edition: https://doi.org/10.23919/INSUCON.2017.8097170],
[Conference or Workshop Item]

Abstract

Nowadays, polymeric insulators are preferred as outdoor insulators due to their numerous advantages in comparison to other materials like glass or ceramic. These insulators and especially their surfaces are exposed to different environmental conditions and stresses. Due to the insulating properties and the used materials like silicone rubber, electrical surface charges can accumulate on the surface of the insulator e.g. during the operation or by friction during the transportation or the mounting. Thereby, an interaction with sessile droplets on the surface is possible. The precise knowledge of the impact of surface charges on the field distribution and the influence of (charged) sessile droplets can expand the knowledge of insulator ageing processes. In this paper the surface charges on a polymeric insulator are investigated in detail by using an electrostatic voltmeter. In addition, the interaction of sessile droplets and the charge transfer between charged droplets and the silicone rubber surface are investigated. Both the charge on droplets as well as the charge on the surface and their interaction has to be taken into account while investigating sessile droplets in electric fields. The experimental results are compared to numerical simulations, which have a good agreement.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Löwe, Jens-Michael and Secklehner, Maximilian and Hinrichsen, Volker
Title: Investigation of surface charges on polymeric insulators and the influence of sessile water droplets
Language: English
Abstract:

Nowadays, polymeric insulators are preferred as outdoor insulators due to their numerous advantages in comparison to other materials like glass or ceramic. These insulators and especially their surfaces are exposed to different environmental conditions and stresses. Due to the insulating properties and the used materials like silicone rubber, electrical surface charges can accumulate on the surface of the insulator e.g. during the operation or by friction during the transportation or the mounting. Thereby, an interaction with sessile droplets on the surface is possible. The precise knowledge of the impact of surface charges on the field distribution and the influence of (charged) sessile droplets can expand the knowledge of insulator ageing processes. In this paper the surface charges on a polymeric insulator are investigated in detail by using an electrostatic voltmeter. In addition, the interaction of sessile droplets and the charge transfer between charged droplets and the silicone rubber surface are investigated. Both the charge on droplets as well as the charge on the surface and their interaction has to be taken into account while investigating sessile droplets in electric fields. The experimental results are compared to numerical simulations, which have a good agreement.

Uncontrolled Keywords: surface charges, silicone rubber, sessile droplet, electrostatic voltmeter
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems > High Voltage Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Transregios
DFG-Collaborative Research Centres (incl. Transregio) > Transregios > TRR 75 Droplet Dynamics Under Extreme Ambient Conditions
Event Title: INSUCON 2017, 13th International Electrical Insulation Conference 2017
Event Location: Birmingham, Großbritannien
Event Dates: 16.05.-18.05.2017
Date Deposited: 06 Jul 2017 11:09
DOI: 10.23919/INSUCON.2017.8097170
Official URL: https://doi.org/10.23919/INSUCON.2017.8097170
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