| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Macgregor, Scott
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Topics
Publications (13/13 displayed)
- 2023Modeling of the transient electric field in multilayer dielectric composites under impulsive HV energizationcitations
- 2021The electric field inside a gas cavity formed at a solid-solid dielectric interface stressed with HV impulse
- 2020The effect of relative humidity on the flashover strength of solid insulation
- 2020Impulsive flashover characteristics and Weibull statistical analysis of gas-solid interfaces with varying relative humiditycitations
- 2018Dynamic behaviour of sub- m particles in dielectric liquids under DC stress
- 2015Decontamination of the hospital environmentcitations
- 2014The degradative effects of germicidal light on flexible endoscope material
- 2011Effect of applied field and rate of voltage rise on surface breakdown of oil-immersed polymerscitations
- 2011Mixtures of midel 7131 and THESO insulating liquids for pulsed power applicationscitations
- 2009Computer aided modelling of an interdigitated microelectrode array impedance biosensor for the detection of bacteriacitations
- 2007An investigation of spark discharge parameters for material processing with high power ultrasoundcitations
- 2006Application of electric spark generated high power ultrasound to recover ferrous and non ferrous metals from slag wastecitations
- 2001Diagnostic dielectric spectroscopy methods applied to water-treedcablecitations
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document
The effect of relative humidity on the flashover strength of solid insulation
Abstract
This paper informs on the flashover strength of 3 materials: Delrin (Polyoxymethylene), HDPE (High Density Polyethylene) and Ultem (Polyetherimide) with 'smooth' and 'knurled' surface finishes, in zero-grade air at -0.5, 0 and 0.5 bar gauge, and at <; 10%, ~50% and >90% relative humidity (RH). All tests were completed using a 10-stage Marx generator, producing HV impulses with a nominal 100/700 ns waveshape. Each test conformed with the ASTM D3426-97 standard of 'step up' testing, to find the average flashover voltage for each set of conditions. The electrode system with each dielectric material demonstrated a decrease in breakdown voltage as the RH was increased. In high humidity environments, the knurled surface finish was seen to have a positive effect on the flashover strength of Delrin and Ultem samples, compared to a smooth, machined surface. Increasing pressure yielded an increase in the flashover strength also. For samples with a smooth surface finish, a decrease in flashover strength was found as the permittivity of the material increased, irrespective of humidity and pressure. However, a knurled surface finish had a much more erratic effect on flashover strength, with no discernible trend with increasing material permittivity