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- Dielectric_gas abstract "A dielectric gas, or insulating gas, is a dielectric material in gaseous state. Its main purpose is to prevent or rapidly quench electric discharges. Dielectric gases are used as electrical insulators in high voltage applications, e.g. transformers, circuit breakers (namely sulfur hexafluoride circuit breakers), switchgear (namely high voltage switchgear), radar waveguides, etc.A good dielectric gas should have high dielectric strength, high thermal stability and chemical inertness against the construction materials used, non-flammability and low toxicity, low boiling point, good heat transfer properties, and low cost.The most common dielectric gas is air, due to its ubiquity and low cost. Another commonly used gas is a dry nitrogen.In special cases, e.g., high voltage switches, gases with good dielectric properties and very high breakdown voltages are needed. Highly electronegative elements, e.g., halogens, are favored as they rapidly recombine with the ions present in the discharge channel. The halogen gases are highly corrosive. Other compounds, which dissociate only in the discharge pathway, are therefore preferred; sulfur hexafluoride, organofluorides (especially perfluorocarbons) and chlorofluorocarbons are the most common.The breakdown voltage of gases is roughly proportional to their density. Breakdown voltages also increase with the gas pressure; many gases however have limited upper pressure due to their liquefaction.The decomposition products of halogenated compounds are highly corrosive, the occurrence of corona discharge should therefore be prevented.Build-up of moisture can degrade dielectric properties of the gas. Moisture analysis is used for early detection of this.Dielectric gases can also serve as coolants.Vacuum is an alternative for gas in some applications.Mixtures of gases can be used where appropriate. Addition of sulfur hexafluoride can dramatically improve the dielectric properties of poorer insulators, e.g. helium or nitrogen. Multicomponent gas mixtures can offer superior dielectric properties; the optimum mixtures combine the electron attaching gases (sulfur hexafluoride, octafluorocyclobutane) with molecules capable of thermalizing (slowing down) accelerated electrons (e.g. tetrafluoromethane, fluoroform. The insulator properties of the gas are controlled by the combination of electron attachment, electron scattering, and electron ionization.Atmospheric pressure significantly influences the insulation properties of air. High-voltage applications, e.g. xenon flash lamps, can experience electrical breakdowns at high altitudes.* the density is approximate; it is normally specified at atmospheric pressure, the temperature may vary, though it is mostly 0 °C.".
- Dielectric_gas wikiPageID "27689481".
- Dielectric_gas wikiPageRevisionID "606129479".
- Dielectric_gas hasPhotoCollection Dielectric_gas.
- Dielectric_gas subject Category:Dielectric_gases.
- Dielectric_gas subject Category:Dielectrics.
- Dielectric_gas subject Category:Electric_power_distribution.
- Dielectric_gas subject Category:Electric_power_systems_components.
- Dielectric_gas type Abstraction100002137.
- Dielectric_gas type Cognition100023271.
- Dielectric_gas type Component105868954.
- Dielectric_gas type Concept105835747.
- Dielectric_gas type Content105809192.
- Dielectric_gas type Dielectrics.
- Dielectric_gas type ElectricPowerSystemsComponents.
- Dielectric_gas type Idea105833840.
- Dielectric_gas type Insulator114821590.
- Dielectric_gas type Material114580897.
- Dielectric_gas type Matter100020827.
- Dielectric_gas type Part105867413.
- Dielectric_gas type Part113809207.
- Dielectric_gas type PhysicalEntity100001930.
- Dielectric_gas type PsychologicalFeature100023100.
- Dielectric_gas type Relation100031921.
- Dielectric_gas type Substance100019613.
- Dielectric_gas comment "A dielectric gas, or insulating gas, is a dielectric material in gaseous state. Its main purpose is to prevent or rapidly quench electric discharges. Dielectric gases are used as electrical insulators in high voltage applications, e.g.".
- Dielectric_gas label "Dielectric gas".
- Dielectric_gas label "Dielektryki gazowe".
- Dielectric_gas sameAs Dielektryki_gazowe.
- Dielectric_gas sameAs m.0c41yt_.
- Dielectric_gas sameAs Q5274910.
- Dielectric_gas sameAs Q5274910.
- Dielectric_gas sameAs Dielectric_gas.
- Dielectric_gas wasDerivedFrom Dielectric_gas?oldid=606129479.
- Dielectric_gas isPrimaryTopicOf Dielectric_gas.