Journal ArticleDOI
Effect of humidity on the breakdown characteristics of air in uniform field for the very low frequency (VLF) band
TLDR
In this article, the role of humidity and frequency on the electrical breakdown of air in uniform field gaps was investigated and a correction factor to calculate breakdown voltage as a function of humidity for VLF was presented.Abstract:
The paper reports about the role of humidity and frequency on the electrical breakdown of air in uniform field gaps. Experiments were conducted on Rogowski-profile electrodes with gap lengths ranging from 5 to 53 mm at power frequency (60 Hz) and frequencies in the range of 18-50 kHz, corresponding to the VLF/LF bands used for long-range communication. The results show that breakdown voltage at VLF decreases with humidity, opposite to that observed at 60 Hz. Breakdown mechanisms for explaining this important phenomenon are proposed. A correction factor to calculate breakdown voltage as a function of humidity for VLF is presented.read more
Citations
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Journal ArticleDOI
Study on oxygen/nitrogen gas mixtures for the surface insulation performance in gas insulated switchgear
Dong-Young Lim,Sungwoo Bae +1 more
TL;DR: In this paper, a comparative study on SF6 alternative candidate gases for the surface insulation performance of eco-friendly GIS and Solid Insulated Switchers (SIS) was presented.
Journal ArticleDOI
Effect of humidity on the breakdown characteristics of air in non-uniform fields at 30 kHz
TL;DR: In this paper, the role of humidity on the breakdown of air in non-uniform fields at 30 kHz was investigated and a correction factor to calculate breakdown voltage as a function of humidity for VLF was presented.
Journal ArticleDOI
Positive impulse flashover along smooth cylindrical insulating surfaces under variable humidity
TL;DR: In this paper, the authors investigated positive impulse flashover along smooth cylindrical insulating surfaces bridging a short rod-plane gap under standard lightning and switching impulse voltages under variable absolute humidity and by regarding the case of air alone as reference.
Journal ArticleDOI
Effect of humidity on dielectric breakdown properties of air considering ion kinetics
TL;DR: In this article, an overall kinetic scheme that includes all the main reactions likely to happen in humid air is established for the first time, and the calculation method of dielectric properties is improved, based on more comprehensive avalanche model considering both spatial growth and temporal processes.
Journal ArticleDOI
Performance Evaluation of Insulators Using Flashover Voltage and Leakage Current
Mohammad Hamed Samimi,Amirhossein Mostajabi,Iman Ahmadi-Joneidi,Amir Abbas Shayegani-Akmal,Hossein Mohseni +4 more
TL;DR: In this article, the effect of pollution on the leakage current of silicone rubber insulators has been evaluated and the results have been analyzed to find appropriate correction factors and to discover the relationship between insulators' leakage current and their status.
References
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Ion mobility spectrometry.
Gary A. Eiceman,Zeev Karpas +1 more
TL;DR: The Society for Ion Mobility Spectrometry and Journal Sample Sample as discussed by the authors Sample Introduction Methods Introduction Vapor Samples Semi-volatile Samples Aqueous Samples Solid Samples Summary Ion Sources Introduction Radioactivity: Nickel, Americium, and Tritium Corona Discharges Photo-ionization: Discharge Lamps and Lasers Electrospray Ionization and its Derivatives Matrix-Assisted Laser Desorption Ionization Surface Ionization Sources Flames Plasma-Based Ion Sources Glow Discharge Ion Source Other Ion Sources Summary Appendix Ion Injection and Pulsed Sources
Journal ArticleDOI
Positive Wire-to-Plane Coronas as Influenced by Atmospheric Humidity
TL;DR: In this article, a method for calculating the inception voltage and corona current in humid air was proposed, and it was found that the photoelectrons distribution within the ionization layer, which depends upon the gap geometry, plays an important role in deciding whether the inception voltages increases or decreases with relative humidity.
Journal ArticleDOI
Electron attachment to van der Waals polymers of water
TL;DR: In this article, negative ions resulting from electron attachment to van der Waals polymers of water are reported, and the most prominent ions observed consititute a homologous series with the stoichiometric formula OH−(H2O)m.
Journal ArticleDOI
The influence of water vapor on avalanches in air
TL;DR: In the early stages of breakdown of a gas, individual avalanches of charged particles are formed as mentioned in this paper, which can yield new information on discharge processes if the measuring system has a high time resolution (1.3 ns) and if the avalanche is initiated at the cathode by means of a very short (0.6 ns) light pulse.
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Positive Streamer Propagation and Breakdown in Air: the Influence of Humidity
TL;DR: In this paper, the influence of humidity on streamer propagation at conditions from the threshold for propagation to those for streamer-induced breakdown was investigated in a uniform field in air at atmospheric pressure.