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1 изоляционная способность
Русско-английский политехнический словарь > изоляционная способность
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2 влияние изоляции
влияние изоляции
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[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
Русско-английский словарь нормативно-технической терминологии > влияние изоляции
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3 изоляционный
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4 изоляционный
Русско-английский словарь по информационным технологиям > изоляционный
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5 влияние изоляции
Engineering: insulating effect -
6 влияние теплоизоляции
Engineering: insulating effectУниверсальный русско-английский словарь > влияние теплоизоляции
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7 защитное влияние
Construction: insulating effect (напр. снежного покрова) -
8 теплоизоляционная способность
Engineering: insulating effectУниверсальный русско-английский словарь > теплоизоляционная способность
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9 явление электрической дуги
явление электрической дуги
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[Интент]Параллельные тексты EN-RU
Electric arc phenomenon
The electric arc is a phenomenon which takes place as a consequence of a discharge which occurs when the voltage between two points exceeds the insulating strength limit of the interposed gas; then, in the presence of suitable conditions, a plasma is generated which carries the electric current till the opening of the protective device on the supply side.
Gases, which are good insulating means under normal conditions, may become current conductors in consequence of a change in their chemical-physical properties due to a temperature rise or to other external factors.
To understand how an electrical arc originates, reference can be made to what happens when a circuit opens or closes.
During the opening phase of an electric circuit the contacts of the protective device start to separate thus offering to the current a gradually decreasing section; therefore the current meets growing resistance with a consequent rise in the temperature.
As soon as the contacts start to separate, the voltage applied to the circuit exceeds the dielectric strength of the air, causing its perforation through a discharge.
The high temperature causes the ionization of the surrounding air which keeps the current circulating in the form of electrical arc. Besides thermal ionization, there is also an electron emission from the cathode due to the thermionic effect; the ions formed in the gas due to the very high temperature are accelerated by the electric field, strike the cathode, release energy in the collision thus causing a localized heating which generates electron emission.
The electrical arc lasts till the voltage at its ends supplies the energy sufficient to compensate for the quantity of heat dissipated and to maintain the suitable conditions of temperature. If the arc is elongated and cooled, the conditions necessary for its maintenance lack and it extinguishes.
Analogously, an arc can originate also as a consequence of a short-circuit between phases. A short-circuit is a low impedance connection between two conductors at different voltages.
The conducting element which constitutes the low impedance connection (e.g. a metallic tool forgotten on the busbars inside the enclosure, a wrong wiring or a body of an animal entered inside the enclosure), subject to the difference of potential is passed through by a current of generally high value, depending on the characteristics of the circuit.
The flow of the high fault current causes the overheating of the cables or of the circuit busbars, up to the melting of the conductors of lower section; as soon as the conductor melts, analogous conditions to those present during the circuit opening arise. At that point an arc starts which lasts either till the protective devices intervene or till the conditions necessary for its stability subsist.
The electric arc is characterized by an intense ionization of the gaseous means, by reduced drops of the anodic and cathodic voltage (10 V and 40 V respectively), by high or very high current density in the middle of the column (of the order of 102-103 up to 107 A/cm2), by very high temperatures (thousands of °C) always in the middle of the current column and – in low voltage - by a distance between the ends variable from some microns to some centimeters.
[ABB]Явление электрической дуги
Электрическая дуга между двумя электродами в газе представляет собой физическое явление, возникающее в тот момент, когда напряжения между двумя электродами превышает значение электрической прочности изоляции данного газа.
При наличии подходящих условий образуется плазма, по которой протекает электрический ток. Ток будет протекать до тех пор, пока на стороне электропитания не сработает защитное устройство.
Газы, являющиеся хорошим изолятором, при нормальных условиях, могут стать проводником в результате изменения их физико-химических свойств, которые могут произойти вследствие увеличения температуры или в результате воздействия каких-либо иных внешних факторов.
Для того чтобы понять механизм возникновения электрической дуги, следует рассмотреть, что происходит при размыкании или замыкании электрической цепи.
При размыкании электрической цепи контакты защитного устройства начинают расходиться, в результате чего постепенно уменьшается сечение контактной поверхности, через которую протекает ток.
Сопротивление электрической цепи возрастает, что приводит к увеличению температуры.
Как только контакты начнут отходить один от другого, приложенное напряжение превысит электрическую прочность воздуха, что вызовет электрический пробой.
Высокая температура приведет к ионизации воздуха, которая обеспечит протекание электрического тока по проводнику, представляющему собой электрическую дугу. Кроме термической ионизации молекул воздуха происходит также эмиссия электронов с катода, вызванная термоэлектронным эффектом. Образующиеся под воздействием очень высокой температуры ионы ускоряются в электрическом поле и бомбардируют катод. Высвобождающаяся, в результате столкновения энергия, вызывает локальный нагрев, который, в свою очередь, приводит к эмиссии электронов.
Электрическая дуга длится до тех пор, пока напряжение на ее концах обеспечивает поступление энергии, достаточной для компенсации выделяющегося тепла и для сохранения условий поддержания высокой температуры. Если дуга вытягивается и охлаждается, то условия, необходимые для ее поддержания, исчезают и дуга гаснет.
Аналогичным образом возникает дуга в результате короткого замыкания электрической цепи. Короткое замыкание представляет собой низкоомное соединение двух проводников, находящихся под разными потенциалами.
Проводящий элемент с малым сопротивлением, например, металлический инструмент, забытый на шинах внутри комплектного устройства, ошибка в электромонтаже или тело животного, случайно попавшего в комплектное устройство, может соединить элементы, находящиеся под разными потенциалами, в результате чего через низкоомное соединение потечет электрический ток, значение которого определяется параметрами образовавшейся короткозамкнутой цепи.
Протекание большого тока короткого замыкания вызывает перегрев кабелей или шин, который может привести к расплавлению проводников с меньшим сечением. Как только проводник расплавится, возникает ситуация, аналогичная размыканию электрической цепи. Т. е. в момент размыкания возникает дуга, которая длится либо до срабатывания защитного устройства, либо до тех пор, пока существуют условия, обеспечивающие её стабильность.
Электрическая дуга характеризуется интенсивной ионизацией газов, что приводит к падению анодного и катодного напряжений (на 10 и 40 В соответственно), высокой или очень высокой плотностью тока в середине плазменного шнура (от 102-103 до 107 А/см2), очень высокой температурой (сотни градусов Цельсия) всегда в середине плазменного шнура и низкому падению напряжения при расстоянии между концами дуги от нескольких микрон до нескольких сантиметров.
[Перевод Интент]Тематики
- НКУ (шкафы, пульты,...)
EN
Русско-английский словарь нормативно-технической терминологии > явление электрической дуги
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10 unir
v.1 to join (juntar) (pedazos, habitaciones).unió los dos palos con una cuerda he joined o tied the two sticks together with a piece of stringEllos unieron las telas They joined the fabrics.Ellos unieron los equipos They merged the teams.2 to connect, to link (comunicar) (ciudades, terminales, aparatos).El cable une la tubería The wire connects the tubing.3 to combine.en su obra une belleza y técnica her work combines beauty with techniqueunir algo a algo to add something to something4 to draw together, to assemble, to unify.El amor une a las personas Love draws people together.* * *1 (juntar) to unite, join, join together2 (combinar) to combine (a, with)3 (enlazar) to link (a, to)\unirse en matrimonio formal to unite in marriage* * *verbto unite, join, link- unirse- unirse a* * *1. VT1) (=acercar)a) [+ grupos, tendencias, pueblos] to uniteb) [sentimientos] to unitea nuestros dos países los unen muchas más cosas de las que los dividen — there are far more things that unite our two countries than divide them
c) [lazos] to link, bindlos lazos que unen ambos países — the ties that bind o link both countries
2) (=atar) [contrato] to bindcon el periódico me unía un mero contrato — I was bound to the newspaper by nothing more than a simple contract
el jugador ha rescindido el contrato que lo unía al club — the player has terminated the contract binding him to the club
3) (=asociar, agrupar) to combineuniendo los dos nombres resulta un nuevo concepto — a new concept is created by combining the two nouns
el esquí de fondo une dos actividades: montañismo y esquí — cross-country skiing combines two activities: mountaineering and skiing
decidieron unir sus fuerzas para luchar contra el crimen — they decided to join forces in the fight against crime
ha logrado unir su nombre al de los grandes deportistas de este siglo — he has won a place among the great sporting names of this century
5) [+ objetos, piezas] [gen] to join, join together; [con pegamento, celo] to stick together; [con clavos, puntas] to fasten togethervan a tirar el tabique para unir el salón a la cocina — they are going to knock together the lounge and the kitchen
6) (Culin) [+ líquidos] to mix; [+ salsa] to blend7) (Com) [+ compañías, intereses] to merge2.See:* * *1.verbo transitivo1)a) < cables> to join; (con cola, pegamento) to stick... together; < esfuerzos> to combinelos unió en matrimonio — (frml) he joined them in matrimony (frml)
b) sentimientos/intereses to uniteunida sentimentalmente a... — (period) romantically involved with...
c) <características/cualidades/estilos> to combine3) ( fusionar) <empresas/organizaciones> to merge4) < salsa> to mix2.unirse v pron1)a) ( aliarse) personas/colectividades to join togetherse unieron para hacer un frente común — they joined forces o united in a common cause
b) características/cualidades to combine3) ( fusionarse) empresas/organizaciones to merge* * *= aggregate, bridge, connect, join together, link, marry, string, unite, confound, piece together, weld into/together, splice, bundle, pool, band, bind + Nombre + together, knit, knit, federate, conjoin, cement.Ex. You have attempted to aggregate the UDC class number incorrectly.Ex. BLAISE offers a variety of services bridging the cataloguing and information retrieval functions.Ex. Plainly, it is not always the case that there is a connection between farming and spelling, and many other documents can be identified where these subjects are not connected.Ex. A portfolio is a container for holding loose materials, e.g. paintings, drawings, papers, unbound sections of a book, and similar materials, consisting of two covers joined together at the back.Ex. These references operate in a similar fashion whether they are used to link authors' names or subject headings.Ex. At that time OCLC was already going strong, and we tried to find some backing from the State of New York and possibly from the federal government to marry those two systems.Ex. There is no question of stringing together simple concepts in a preferred citation order to produce a single index description of the summarized subject content of a document.Ex. It has become increasingly difficult to unite both categories in one union and demands for a trade union of library employees have been raised.Ex. The confounding of opposites is also common though, again, care has to be taken to see that we do not confound two subjects on which extensive literature exists.Ex. During his stay in Laputa, Captain Gulliver was very impressed by a book-writing machine which produced fragments of sentences which were dictated to scribes and later pieced together.Ex. The Department of Trade and Industry has undergone many changes over the years; it has been split into two separate departments and welded together again.Ex. A filmloop is a short length of film enclosed in a cassette and with the end of the film spliced on to the beginning so that it requires no rewinding.Ex. CD-ROM products that combine, or bundle, related information services will be at the forefront because of their usefulness to end-users.Ex. The results of two studies of the way reference librarians work were pooled to provide an understanding of the important features necessary in software for computerized reference work.Ex. The author advises banding retention policies to focus on a few clear options.Ex. People value the public library highly as an educational and community resource and the library acts as an 'information junction' to bind the community together.Ex. I want to knit that to another Internet format, which is the Web log -- the 'blog'.Ex. I want to knit that to another Internet format, which is the Web log -- the 'blog'.Ex. The usefulness of the many online periodicals and scientific digital libraries that exist today is limited by the inability to federate these resources through a unified interface.Ex. The grotesque is an effect achieved by conjoining disparate framents which do not realistically belong together.Ex. An in-house bulletin may serve to cement firm relationships with the library's personnel.----* conseguir unir = rally.* unir a = tie (to), couple with.* unir esfuerzos = join + hands.* unir fuerzas = join + forces, pool + forces.* unir inextricablemente = interweave.* unir mediante espigas = tenon.* unir mediante hiperenlaces = hotlink [hot-link].* unir mediante mortaja = mortise.* unirse = come together, partner, bond, stand up as + one.* unirse a = ally with, join, hop on, join + Posesivo + ranks.* unirse a una conversación = chime in.* unirse en matrimonio = tie + the knot.* unir sin solapar = butt together.* volverse a unir a = rejoin.* * *1.verbo transitivo1)a) < cables> to join; (con cola, pegamento) to stick... together; < esfuerzos> to combinelos unió en matrimonio — (frml) he joined them in matrimony (frml)
b) sentimientos/intereses to uniteunida sentimentalmente a... — (period) romantically involved with...
c) <características/cualidades/estilos> to combine3) ( fusionar) <empresas/organizaciones> to merge4) < salsa> to mix2.unirse v pron1)a) ( aliarse) personas/colectividades to join togetherse unieron para hacer un frente común — they joined forces o united in a common cause
b) características/cualidades to combine3) ( fusionarse) empresas/organizaciones to merge* * *= aggregate, bridge, connect, join together, link, marry, string, unite, confound, piece together, weld into/together, splice, bundle, pool, band, bind + Nombre + together, knit, knit, federate, conjoin, cement.Ex: You have attempted to aggregate the UDC class number incorrectly.
Ex: BLAISE offers a variety of services bridging the cataloguing and information retrieval functions.Ex: Plainly, it is not always the case that there is a connection between farming and spelling, and many other documents can be identified where these subjects are not connected.Ex: A portfolio is a container for holding loose materials, e.g. paintings, drawings, papers, unbound sections of a book, and similar materials, consisting of two covers joined together at the back.Ex: These references operate in a similar fashion whether they are used to link authors' names or subject headings.Ex: At that time OCLC was already going strong, and we tried to find some backing from the State of New York and possibly from the federal government to marry those two systems.Ex: There is no question of stringing together simple concepts in a preferred citation order to produce a single index description of the summarized subject content of a document.Ex: It has become increasingly difficult to unite both categories in one union and demands for a trade union of library employees have been raised.Ex: The confounding of opposites is also common though, again, care has to be taken to see that we do not confound two subjects on which extensive literature exists.Ex: During his stay in Laputa, Captain Gulliver was very impressed by a book-writing machine which produced fragments of sentences which were dictated to scribes and later pieced together.Ex: The Department of Trade and Industry has undergone many changes over the years; it has been split into two separate departments and welded together again.Ex: A filmloop is a short length of film enclosed in a cassette and with the end of the film spliced on to the beginning so that it requires no rewinding.Ex: CD-ROM products that combine, or bundle, related information services will be at the forefront because of their usefulness to end-users.Ex: The results of two studies of the way reference librarians work were pooled to provide an understanding of the important features necessary in software for computerized reference work.Ex: The author advises banding retention policies to focus on a few clear options.Ex: People value the public library highly as an educational and community resource and the library acts as an 'information junction' to bind the community together.Ex: I want to knit that to another Internet format, which is the Web log -- the 'blog'.Ex: I want to knit that to another Internet format, which is the Web log -- the 'blog'.Ex: The usefulness of the many online periodicals and scientific digital libraries that exist today is limited by the inability to federate these resources through a unified interface.Ex: The grotesque is an effect achieved by conjoining disparate framents which do not realistically belong together.Ex: An in-house bulletin may serve to cement firm relationships with the library's personnel.* conseguir unir = rally.* unir a = tie (to), couple with.* unir esfuerzos = join + hands.* unir fuerzas = join + forces, pool + forces.* unir inextricablemente = interweave.* unir mediante espigas = tenon.* unir mediante hiperenlaces = hotlink [hot-link].* unir mediante mortaja = mortise.* unirse = come together, partner, bond, stand up as + one.* unirse a = ally with, join, hop on, join + Posesivo + ranks.* unirse a una conversación = chime in.* unirse en matrimonio = tie + the knot.* unir sin solapar = butt together.* volverse a unir a = rejoin.* * *unir [I1 ]vtA1«persona»: unió los trozos con un pegamento she stuck the pieces together with glueunió los cables con cinta aislante he joined the wires with insulating tapeha unido dos estilos muy diferentes he has combined two very different stylesunamos nuestros esfuerzos let us combine our efforts2 «sentimientos/intereses» to unitelos unía el deseo de … they were united by their desire to …los une su afición al deporte their love of sport binds them together o acts as a bond between them o unites themel amor que nos une the love which unites usunida sentimentalmente a … ( period); romantically involved with …3 ‹características/cualidades› unir algo A algo to combine sth WITH sthune a su inteligencia una gran madurez he combines intelligence with great maturityB (comunicar) to linkla nueva carretera une los dos pueblos the new road links the two townsel puente aéreo que une las dos ciudades the shuttle service which runs between o links the two citiesC ‹salsa› to mix■ unirseA1 (aliarse) «personas/colectividades» to join togetherse unieron para hacer un frente común they joined forces o united in a common causelos dos países se unieron en una federación the two countries joined together to form a federationse unieron en matrimonio they were married, they were joined in matrimony ( frml)varias empresas se unieron para formar un consorcio several companies joined together o came together o combined to form a consortiumunirse A algo:se unió a nuestra causa he joined our cause2 «características/cualidades» to combineen él se unen la ambición y el orgullo ambition and pride come together o combine in him, he combines ambition with pridea su belleza se une una gran simpatía her beauty is combined with a very likable personalityB (juntarse) «caminos» to converge, meetdonde el tráfico del oeste se une con el del norte where traffic from the west converges with o meets traffic from the north* * *
unir ( conjugate unir) verbo transitivo
1
(con cola, pegamento) to stick … together;
‹ esfuerzos› to combine
unir algo a algo to combine sth with sth
2 ( comunicar) ‹ lugares› to link
3 ( fusionar) ‹empresas/organizaciones› to merge
unirse verbo pronominal
1 ( aliarse) [personas/colectividades] to join together;
2 ( juntarse) [ caminos] to converge, meet
3 ( fusionarse) [empresas/organizaciones] to merge
unir verbo transitivo
1 (cables, conexiones) to join, unite
2 (esfuerzos, intereses) to join
(asociar, fusionar) unieron sus empresas, they merged their companies
3 (comunicar) to link: ese camino une las dos aldeas, that path links the two villages
' unir' also found in these entries:
Spanish:
acercar
- casar
- empalmar
- fundir
- juntar
- ligar
- remachar
- vincular
English:
bond
- cement
- connect
- couple
- join
- join up
- link
- neither
- screw together
- stick together
- unite
- yoke
- amalgamate
- bring
- marry
- reunite
- splice
- unify
* * *♦ vt1. [juntar] [pedazos, piezas, habitaciones] to join;[empresas, estados, facciones] to unite; Informát [archivos] to merge;unió los dos palos con una cuerda he joined o tied the two sticks with a piece of string;debemos unir fuerzas we must combine forcesles une una fuerte amistad they are very close friends, they share a very close friendship;les une su pasión por la música they share a passion for music;los lazos que nos unen the ties that bind us;Formalunir a dos personas en (santo) matrimonio to join two people in (holy) matrimony3. [comunicar] [ciudades, terminales, aparatos] to connect, to link;la línea férrea que une la capital a o [m5] con la costa the railway o US railroad between o which links the capital and the coast4. [combinar] to combine;en su obra une belleza y técnica her work combines beauty with technique;unir algo a algo [añadir] to add sth to sth;a la desinformación hay que unir también el desinterés de la gente in addition to the lack of information, we have to take into account people's lack of interest5. [mezclar] to mix o blend in;una la mantequilla con el azúcar cream together the butter and the sugar* * *v/t1 join2 personas unite3 características combine ( con with)4 ciudades link* * *unir vt1) juntar: to unite, to join, to link2) combinar: to combine, to blend* * *unir vb1. (juntar) to join2. (comunicar) to link3. (relacionar) to unite -
11 слой
слой сущcoatingверхние слои атмосферыupper atmosphereветер в верхних слоях атмосферы1. upper wind2. aloft wind влияние пограничного слояboundary-layer effectвоздух в пограничном слоеboundary-layer airгребень для ограничения пограничного слояboundary-layer fenceдренажный слой ВППrunway wearing courseзакрылок со сдувом пограничного слояblown flapзакрылок с отсосом пограничного слояsuction flapзащитный слой1. protective layer2. protective coating зондирование верхних слоев атмосферыupper-air soundingизолирующий слойinsulating layerкарта верхних слоев атмосферыupper-air streamlineкарта особых явлений погоды в верхних слоях атмосферыhigh level significant weather chartкарта прогнозов состояния верхних слоев атмосферыprognostic upper air chartкрыло с управляемым пограничным слоемbackswept boundary layer controlled wingламинарный слойlaminar layerметод разбивки атмосферы на слоиatmospheric layering techniqueнагрев пограничного слояboundary layer heatingнаносить слойapply coatingнижние слои атмосферыlower atmosphereотверстие для отсоса пограничного слоя на крылеboundary layer bleed perforationотделение пограничного слояboundary layer separationотделитель пограничного слояboundary layer splitter plateотсос пограничного слояboundary layer suctionплотный верхний слой облакаdense upper cloudsпограничный слойboundary layerразделитель пограничного слояboundary layer splitterсдувание пограничного слояboundary-layer removalсдув пограничного слояboundary layer blowingслой атмосферыatmospheric shellслой атмосферы между эшелонамиlayer between levelsслой атмосферы с температурной инверсиейlidслой консервацииpreservative coatingслой кордаfabric layerслой корда покрышкиtire cord layerслой облаковcloud sheetслой облачностиcloud layerслой сплошной облачностиblanketсопротивление при образовании пограничного слояboundary-layer dragтемпература верхних слоев атмосферыupper air temperatureтемпература пограничного слояboundary layer temperatureтурбулентный слойturbulent layerуправление пограничным слоемboundary layer controlустойчивость пограничного слояboundary layer stabilityформа пограничного слояboundary layer configurationфрикционный слойfriction padэнергия пограничного слояboundary layer energy -
12 действие электрической дуги, возникающей внутри НКУ распределения и управления
действие электрической дуги, возникающей внутри НКУ распределения и управления
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[Интент]Параллельные тексты EN-RU
Effects of the electric arc inside switchgear and controlgear assemblies
In the proximity of the main boards, i.e. in the proximity of big electrical machines, such as transformers or generators, the short-circuit power is high and consequently also the energy associated with the electrical arc due to a fault is high.
Without going into complex mathematical descriptions of this phenomenon, the first instants of arc formation inside a cubicle can be schematized in 4 phases:
1. compression phase: in this phase the volume of the air where the arc develops is overheated owing to the continuous release of energy; due to convection and radiation the remaining volume of air inside the cubicle warms up; initially there are temperature and pressure values different from one zone to another;
2. expansion phase: from the first instants of internal pressure increase a hole is formed through which the overheated air begins to go out. In this phase the pressure reaches its maximum value and starts to decrease owing to the release of hot air;
3. emission phase: in this phase, due to the continuous contribution of energy by the arc, nearly all the air is forced out under a soft and almost constant overpressure;
4. thermal phase: after the expulsion of the air, the temperature inside the switchgear reaches almost that of the electrical arc, thus beginning this final phase which lasts till the arc is quenched, when all the metals and the insulating materials coming into contact undergo erosion with production of gases, fumes and molten material particles.
Should the electrical arc occur in open configurations, some of the described phases could not be present or could have less effect; however, there shall be a pressure wave and a rise in the temperature of the zones surrounding the arc.
Being in the proximity of an electrical arc is quite dangerous; here are some data to understand how dangerous it is:
• pressure: at a distance of 60 cm from an electrical arc associated with a 20 kA arcing fault a person can be subject to a force of 225 kg; moreover, the sudden pressure wave may cause permanent injuries to the eardrum;
• arc temperatures: about 7000-8000 °C;
• sound: electrical arc sound levels can reach 160 db, a shotgun blast only 130 db.
[ABB]Действие электрической дуги, возникающей внутри НКУ распределения и управления
Короткое замыкание вблизи больших силовых устройств, таких как трансформаторы или генераторы имеет очень большую мощность. Поэтому энергия электрической дуги, возникшей в результате короткого замыкания, очень большая.
Не вдаваясь в сложное математическое описание данного явления, можно сказать, что первые мгновения формирования дуги внутри шкафа можно упрощенно разделить на четыре этапа:
1. Этап сжатия: на этом этапе объем воздуха, в котором происходит зарождение дуги перегревается вследствие непрерывного высвобождения энергии. За счет конвекции и излучения оставшийся объем воздуха внутри шкафа нагревается. На этом начальном этапе значения температуры и давления воздуха в разных зонах НКУ разные.
2. Этап расширения: с первых мгновений внутреннее давление создает канал, через который начинается движение перегретого воздуха. На этом этапе давление достигает своего максимального значения, после чего начинает уменьшаться вследствие выхода горячего воздуха.
3. Этап эмиссии: на этом этапе вследствие непрерывного пополнения энергией дуги почти весь воздух выталкивается под действием мягкого и почти постоянного избыточного давления.
4. Термический этап: после выхлопа воздуха температура внутри НКУ почти достигает температуры электрической дуги. Так начинается заключительный этап, который длится до тех пор, пока дуга не погаснет. При этом все металлические и изоляционные материалы, вступившие в контакт с дугой, оказываются подвергнутыми эрозии с выделением газов, дыма и частиц расплавленного материала.
Если электрическая дуга возникнет в открытом НКУ, то некоторые из описанных этапов могут не присутствовать или могут иметь меньшее воздействие. Тем не менее будет иметь место воздушная волна и подъем температуры вблизи дуги.
Находиться вблизи электрической дуги довольно опасно. Ниже приведены некоторые сведения, помогающие осознать эту опасность:
• давление: На расстоянии 60 см от электрической дуги, вызванной током короткого замыкания 20 кА, человек может подвергнуться воздействию силы 225 кг. Более того, резкая волна давления может нанести тяжелую травму барабанным перепонкам;
• температура дуги: около 7000-8000 °C;
• шумовое воздействие: Уровень шумового воздействия электрической дуги может достигнуть 160 дБ (выстрел из дробовика – 130 дБ).
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Русско-английский словарь нормативно-технической терминологии > действие электрической дуги, возникающей внутри НКУ распределения и управления
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