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http://dbpedia.org/ontology/abstract Una Descàrrega de pinzell és una descàrregUna Descàrrega de pinzell és una descàrrega elèctrica disruptiva similar a una descàrrega de corona que té lloc en un elèctrode quan se li aplica una alta tensió, estant situat dins d'un fluid no conductor, generalment l'aire. Es caracteritza per múltiples espurnes lluminoses i escampades en totes direccions com serpentines de plasma compostes de partícules ionitzades, que surten repetidament de l'elèctrode cap a l'aire, sovint amb un so d'espurneig. Les serpentines s'estenen en forma de ventall, donant-li l'aspecte d'un “pinzell”.ntall, donant-li l'aspecte d'un “pinzell”. , Wyładowanie snopiaste - rodzaj wyładowaniaWyładowanie snopiaste - rodzaj wyładowania elektrycznego zachodzącego w powietrzu, powstające wskutek jonizacji udarowej w pobliżu ostrza elektrody. Wyładowanie to przyjmuje postać pęczka świetlistych smug sprawiających wrażenie swobodnie spływających z ostrza. Zjawisko to jest pośrednim efektem między wyładowaniem koronowym a iskrą elektryczną. Smugi nie przebiegają w tym wypadku po całej powierzchni pomiędzy elektrodami, lecz urywają się w powietrzu. Wokół elektrody powietrze staje się wysoce zjonizowane, gdyż panuje w jej pobliżu duże zagęszczenie natężenia pola elektromagnetycznego. Powstanie tego rodzaju wyładowań uzależnione jest m.in. od napięcia, biegunowości zacisku oraz kształtu i długości ostrza. Z wyładowaniami snopiastymi mamy do czynienia niemal przy wszystkich rodzajach wyładowań z izolatorów. Elektrony zagęszczone na ostrzu katody wzajemnie wypychają się na zewnątrz, kiedy natomiast ostrze jest anodą wtenczas katoda kształtuje się w przestrzeni gazowej - pojawiają się wtenczas delikatne ścieżki - snopki elektronów - wędrujących do metalowej elektrody.onów - wędrujących do metalowej elektrody. , A brush discharge is an electrical disruptA brush discharge is an electrical disruptive discharge similar to a corona discharge that takes place at an electrode with a high voltage applied to it, embedded in a nonconducting fluid, usually air. It is characterized by multiple luminous writhing sparks, plasma streamers composed of ionized air molecules, which repeatedly strike out from the electrode into the air, often with a crackling sound. The streamers spread out in a fan shape, giving it the appearance of a "brush". Corona and brush discharges are sometimes called one-electrode discharges because they occur in the vicinity of a single electrode, and don't extend as far as the electrode carrying opposite polarity voltage in the circuit, as an electric arc (a two-electrode discharge) does. * Corona discharge — occurs at sharp points and edges (radius < 1 mm). It is a uniform ionization (glow discharge) visible as a dim stationary blue glow, fading out as it extends from the conductor. * Brush discharge — occurs at a curved electrode (radius between 5 and 50 mm) in the vicinity of a flat electrode. It consists of a short ionization channel which breaks up into a fan of multiple moving streamers which strike toward the other electrode. If the electrode is too sharp, a corona discharge will usually occur instead of a brush discharge. * Arc or spark discharge — A "two electrode" discharge that occurs when an ionized channel extends all the way from one electrode to the other. This allows a large current to flow, releasing a large amount of energy. Both brush and corona discharges represent local regions next to conductors where due to the high voltage the air has undergone electrical breakdown: it has ionized and become conductive, allowing current to leak into the air. They occur when the electric field at the conductor exceeds the dielectric strength of the air, the "disruptive potential gradient", roughly 30 kilovolts per centimeter. At that voltage, electrons in the air are accelerated by the electric field to a high enough velocity that they knock other electrons off gas molecules when they hit them, creating ions and additional electrons, which go on to ionize additional molecules in a chain reaction. The electric field is highest at sharp points on the conductor, so discharges tend to form at these points. Because the electric field decreases as the distance from the conductor increases, it eventually drops below the value needed for ionization, so corona and brush discharges have a limited extent and are localized near the conductor. Occurring in very high voltage equipment like EHV power transmission lines, radio transmitters and their antennas, CRT power supplies, and power supplies for scientific equipment like lasers and particle accelerators, a brush discharge represents a serious failure of electrical insulation, and may be a fire hazard. Like other electric arcs, brush discharges produce ozone gas, which can be noxious to nearby people in an enclosed space and over time can cause embrittlement of some plastics. Tesla coils producing brush discharges and streamer discharges are displayed for entertainment at science fairs and rock concerts. The ability of an electrical discharge to cause an explosion in flammable atmospheres is measured by the effective energy of the discharge. The effective energy of brush discharges is 10-20 mJ, much larger than that of corona discharges 0.1 mJ. Therefore, brush discharges are considered an explosion hazard, while corona discharges are not. Brush discharges can occur from charged insulating plastics (for example polythene) to a conductor.cs (for example polythene) to a conductor.
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rdfs:comment A brush discharge is an electrical disruptA brush discharge is an electrical disruptive discharge similar to a corona discharge that takes place at an electrode with a high voltage applied to it, embedded in a nonconducting fluid, usually air. It is characterized by multiple luminous writhing sparks, plasma streamers composed of ionized air molecules, which repeatedly strike out from the electrode into the air, often with a crackling sound. The streamers spread out in a fan shape, giving it the appearance of a "brush".pe, giving it the appearance of a "brush". , Wyładowanie snopiaste - rodzaj wyładowaniaWyładowanie snopiaste - rodzaj wyładowania elektrycznego zachodzącego w powietrzu, powstające wskutek jonizacji udarowej w pobliżu ostrza elektrody. Wyładowanie to przyjmuje postać pęczka świetlistych smug sprawiających wrażenie swobodnie spływających z ostrza. Zjawisko to jest pośrednim efektem między wyładowaniem koronowym a iskrą elektryczną.yładowaniem koronowym a iskrą elektryczną. , Una Descàrrega de pinzell és una descàrregUna Descàrrega de pinzell és una descàrrega elèctrica disruptiva similar a una descàrrega de corona que té lloc en un elèctrode quan se li aplica una alta tensió, estant situat dins d'un fluid no conductor, generalment l'aire. Es caracteritza per múltiples espurnes lluminoses i escampades en totes direccions com serpentines de plasma compostes de partícules ionitzades, que surten repetidament de l'elèctrode cap a l'aire, sovint amb un so d'espurneig. Les serpentines s'estenen en forma de ventall, donant-li l'aspecte d'un “pinzell”.ntall, donant-li l'aspecte d'un “pinzell”.
rdfs:label Brush discharge , Descàrrega de pinzell , Wyładowanie snopiaste
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