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Experimental Investigation of the Influence of Electric Charge on the Behavior of Water Droplets in Electric Fields

Löwe, Jens-Michael and Hinrichsen, Volker (2019):
Experimental Investigation of the Influence of Electric Charge on the Behavior of Water Droplets in Electric Fields.
In: 20th IEEE International Conference on Dielectric Liquids (ICDL), Rom, Italien, 23.06.2019 - 27.06.2019, [Online-Edition: https://www.icdl2019.org/],
[Conference or Workshop Item]

Abstract

High voltage insulators in electric power transmission and distribution must withstand extreme weather conditions like rain or snow without long-term degradation. One difficulty is the presence of water droplets residing on the hydrophobic silicone rubber surface of insulators, which locally alter the electric field and leads to ageing of the insulator's surface. The present contribution investigates the behavior of sessile water droplets exposed to strong electric fields with a highspeed camera. Electrically charged and uncharged droplets are generated under well-defined conditions and placed on a generic insulator model. The oscillation frequency of the droplet in resonance mode is investigated in detail with respect to the amount of charge, droplet volume, frequency of the electric field as well as the electric field strength. Significant changes in drop behavior are observed depending on the charge and the electric field strength. A regime map based on the experimental data as well as a mathematical model is developed to quantify the necessary conditions for the change of behavior. The performed experiments improve the understanding of droplets in elect fields as well as the ageing process of high voltage insulators.

Item Type: Conference or Workshop Item
Erschienen: 2019
Creators: Löwe, Jens-Michael and Hinrichsen, Volker
Title: Experimental Investigation of the Influence of Electric Charge on the Behavior of Water Droplets in Electric Fields
Language: English
Abstract:

High voltage insulators in electric power transmission and distribution must withstand extreme weather conditions like rain or snow without long-term degradation. One difficulty is the presence of water droplets residing on the hydrophobic silicone rubber surface of insulators, which locally alter the electric field and leads to ageing of the insulator's surface. The present contribution investigates the behavior of sessile water droplets exposed to strong electric fields with a highspeed camera. Electrically charged and uncharged droplets are generated under well-defined conditions and placed on a generic insulator model. The oscillation frequency of the droplet in resonance mode is investigated in detail with respect to the amount of charge, droplet volume, frequency of the electric field as well as the electric field strength. Significant changes in drop behavior are observed depending on the charge and the electric field strength. A regime map based on the experimental data as well as a mathematical model is developed to quantify the necessary conditions for the change of behavior. The performed experiments improve the understanding of droplets in elect fields as well as the ageing process of high voltage insulators.

Uncontrolled Keywords: Terms—sessile droplet, electro-hydrodynamics, electric charge, composite insulator, droplet resonance, electric field, ageing
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: 20th IEEE International Conference on Dielectric Liquids (ICDL)
Event Location: Rom, Italien
Event Dates: 23.06.2019 - 27.06.2019
Date Deposited: 07 May 2019 08:25
Official URL: https://www.icdl2019.org/
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