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Droplet behavior under the impact of lightning and switching impulse voltage

Löwe, Jens-Michael and Hinrichsen, Volker and Tropea, Cameron (2018):
Droplet behavior under the impact of lightning and switching impulse voltage.
In: IEEE 36th Electrical Insulation Conference (EIC), San Antonio, Texas (USA), 17 - 20 June 2018, DOI: 10.1109/EIC.2018.8480884, [Online-Edition: https://doi.org/10.1109/EIC.2018.8480884],
[Conference or Workshop Item]

Abstract

Sessile water droplets on insulating surfaces influence the ageing behavior of the insulating material, especially for composite insulators, which are covered by silicone rubber. The hydrophobic silicone surface causes the formation of high contact angles of sessile droplets, which leads to local enhancement of the electric field directly at the contact line. The enhanced electric field can cause partial discharges, which deteriorate the surface properties and enhance ageing of the surface. During operation, beside the constant stress by AC or DC voltage, composite insulators are exposed to different transient electrical stresses like switching or lightning impulse voltages. In this paper the impact of switching and lightning impulse voltage on multiple droplets is investigated to improve the understanding of the interaction between the droplets and the electric field, especially during operation. The behavior of multiple droplets is investigated in dependence on droplet-droplet distance, droplet volume as well as the applied voltage amplitude. Depending on the boundary conditions, three different regimes for multiple droplet interaction are identified: coalescence of droplets, vibration or movement of the individual droplets without coalescence and no interaction. Thereby, the investigation improves the understanding of the behavior of sessile droplets as well as the interaction of several droplets exposed to transient electric fields, and thus the understanding of ageing mechanisms of composite insulators.

Item Type: Conference or Workshop Item
Erschienen: 2018
Creators: Löwe, Jens-Michael and Hinrichsen, Volker and Tropea, Cameron
Title: Droplet behavior under the impact of lightning and switching impulse voltage
Language: English
Abstract:

Sessile water droplets on insulating surfaces influence the ageing behavior of the insulating material, especially for composite insulators, which are covered by silicone rubber. The hydrophobic silicone surface causes the formation of high contact angles of sessile droplets, which leads to local enhancement of the electric field directly at the contact line. The enhanced electric field can cause partial discharges, which deteriorate the surface properties and enhance ageing of the surface. During operation, beside the constant stress by AC or DC voltage, composite insulators are exposed to different transient electrical stresses like switching or lightning impulse voltages. In this paper the impact of switching and lightning impulse voltage on multiple droplets is investigated to improve the understanding of the interaction between the droplets and the electric field, especially during operation. The behavior of multiple droplets is investigated in dependence on droplet-droplet distance, droplet volume as well as the applied voltage amplitude. Depending on the boundary conditions, three different regimes for multiple droplet interaction are identified: coalescence of droplets, vibration or movement of the individual droplets without coalescence and no interaction. Thereby, the investigation improves the understanding of the behavior of sessile droplets as well as the interaction of several droplets exposed to transient electric fields, and thus the understanding of ageing mechanisms of composite insulators.

Uncontrolled Keywords: sessile droplet, composite insulator, electrohydrodynamics, electro-coalescence, impulse voltage
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA)
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: IEEE 36th Electrical Insulation Conference (EIC)
Event Location: San Antonio, Texas (USA)
Event Dates: 17 - 20 June 2018
Date Deposited: 13 Aug 2018 14:00
DOI: 10.1109/EIC.2018.8480884
Official URL: https://doi.org/10.1109/EIC.2018.8480884
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