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41 metallic-electrode arc lamp
Универсальный англо-русский словарь > metallic-electrode arc lamp
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42 voltaic arc
1. электрическая дуга2. вольтова дуга -
43 compound arc
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44 contact arc
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45 electrical arc
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46 flaming arc
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47 minute of arc
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48 musical arc
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49 nontransferred arc
English-Russian big polytechnic dictionary > nontransferred arc
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50 rise of arc
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51 direct spinal arc
The English-Russian dictionary general scientific > direct spinal arc
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52 reflex arc
The English-Russian dictionary general scientific > reflex arc
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53 vacuum arc
The English-Russian dictionary general scientific > vacuum arc
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54 electric arc phenomenon
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
Англо-русский словарь нормативно-технической терминологии > electric arc phenomenon
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55 металлодуговая сварка
Большой англо-русский и русско-английский словарь > металлодуговая сварка
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56 welding
сварка || сварочный
- a.c. arc welding
- acetylene welding
- air-acetylene welding
- all-position welding
- aluminothermic welding
- arc welding
- arc stud welding
- argon arc welding
- armour welding
- atomic welding
- atomic-hydrogen welding
- autogenous welding
- automatic welding
- back-hand welding
- back-step welding
- backward welding
- balanced welding
- bare-electrode welding
- bare-wire welding
- bead welding
- bench welding
- bevel welding
- blacksmith welding
- bridge welding
- bronze welding
- built-up welding
- butt welding
- butt seam welding
- button welding
- carbon-electrode welding
- carbon-arc welding
- carbon-dioxide-shielded arc welding
- cold welding
- condenser energy-storage welding
- contact welding
- continuous welding
- cross-wire welding
- d.c. welding
- d.c. arc welding
- deck welding
- direct welding
- double-electrode arc welding
- double-carbon arc welding
- downhand welding
- duplex welding
- duplex spot welding
- electric welding
- electric resistance welding
- electric-arc welding
- electromagnetic welding
- electromagnetic percussive welding
- electromatic welding
- electronic arc welding
- electropercussive welding
- electroslag welding
- electrostatic welding
- electrostatic percussive welding
- energy-storage welding
- erection welding
- field welding
- fillet welding
- fire-cracker welding
- fish-scale welding
- flash welding
- flash upset welding
- flat welding
- floor welding
- forehand welding
- forge welding
- forged spot welding
- fork welding
- friction welding
- fusarc welding
- fuse welding
- fusion welding
- galvanized welding
- gas welding
- gas-arc welding
- gas-pressure welding
- gas-shielded welding
- girth welding
- graphite arc welding
- gravity position welding
- groove welding
- hammer welding
- hammered resistance welding
- hand welding
- heavy welding
- heliarc welding
- helium arc welding
- hidden arc welding
- high-frequency welding
- horizontal welding
- hot-air welding
- hydrogen arc welding
- hydromatic welding
- indirect welding
- inert arc welding
- inert-gas arc welding
- intermittent welding
- inverted welding
- jump welding
- lap welding
- left-hand welding
- leftward welding
- light-gauge welding
- Linde welding
- line welding
- machine welding
- magnetic energy-storage welding
- manual welding
- mash welding
- mash seam welding
- metal welding
- metal-arc welding
- metal electrode welding
- metallic arc welding
- Mig welding
- mitre-flash welding
- mould welding
- multilayer welding
- multipass welding
- multiple-electrode welding
- multiple-electrode spot welding
- multiple-operator welding
- multiple-projection welding
- multiple-spot welding
- non-ferrous welding
- non-pressure welding
- one-operator vertical welding
- overhead welding
- overlap welding
- overlapping welding
- overlaying welding
- oxy-acetylene welding
- oxy-acetylene pressure welding
- oxy-butane welding
- oxy-hydrogen welding
- oxy-propane welding
- percussion welding
- percussive welding
- pin-point welding
- pipe welding
- pipeline welding
- plastic welding
- plate welding
- plug welding
- point welding
- poke welding
- press welding
- press cold welding
- pressure welding
- pressure contact welding
- pressure thermit welding
- program welding
- projection welding
- pulsation welding
- quasi-arc welding
- radio-frequency welding
- refrigerated welding
- refrigerated resistance welding
- relief welding
- resistance welding
- resistance percussion welding
- resistance stud welding
- ridge welding
- rightward welding
- rigid string welding
- ripple welding
- rivet welding
- roll welding
- roller spot welding
- scarf welding
- seam welding
- seam resistance welding
- self-adjusting arc welding
- semi-automatic welding
- sequence resistance welding
- series welding
- shape welding
- shielded arc welding
- shop welding
- shot welding
- shrink welding
- SIGMA welding
- single-spot welding
- site welding
- skip welding
- slot welding
- smith welding
- solid phase welding
- sound welding
- spot welding
- step-back welding
- stitch welding
- stored-energy welding
- stored-energy resistance welding
- string bead welding
- structural welding
- stud welding
- submerged arc welding
- submerged melt welding
- T welding
- tack welding
- Technotherm-Rakos welding
- tee welding
- T-fillet welding
- thermit welding
- thermit fusion welding
- Thomson welding
- tie welding
- Tig welding
- tip welding
- torch welding
- touch welding
- tube welding
- tungsten-arc welding
- twin-arc welding
- two-operator vertical welding
- ultrasonic welding
- ultra-speed welding
- underwater welding
- underwater arc welding
- unshielded arc welding
- upset welding
- upset butt welding
- vertical welding
- wandering welding
- wash welding
- water-gas welding
- Weibel welding
- Zerener welding
- zero welding -
57 welding
1) сварка
2) горнильный
3) горновой
4) заваривание
5) заварка
6) заварочный
7) сваривание
8) сварок
9) приварка
10) спаивание
11) сварочный
– arc welding
– argon-arc welding
– atomic-hydrogen welding
– automatic arc welding
– back-step welding
– backhand welding
– bare-electrode welding
– butt welding
– c welding
– carbon arc welding
– cascade welding
– cold welding
– constricted arc welding
– consumable-electrode arc welding
– controlled-atmosphere welding
– covered-electrode arc welding
– d c welding
– deck arc welding
– diffusion welding
– down-hand welding
– downhand welding
– downhill welding
– downward welding
– electric-arc welding
– electron-beam welding
– electroslag welding
– erection welding
– explosion welding
– fillet welding
– forehand welding
– forge welding
– frame welding
– friction welding
– fusion welding
– gas welding
– gas-shielded are welding
– heating for welding
– helium arc welding
– hidden arc welding
– high-frequency welding
– hot-tool welding
– inert gas arc welding
– intermittent welding
– jointless welding
– lap welding
– laser welding
– longitudinal welding
– machine welding
– magnetic-discharge welding
– manual arc welding
– metallic arc welding
– MIG welding
– multi-electrode welding
– multiple-operator welding
– multiple-spot welding
– nitrogen-shielded arc welding
– noncontact welding
– open-arc welding
– overhead welding
– oxy-acetylene welding
– oxyacetylene welding
– oxyhydrogen welding
– percussion welding
– pick up welding
– pipe welding
– plasma-arc welding
– plug welding
– powder welding
– pressure gas welding
– pressure welding
– pressure-gas welding
– projection welding
– pulsed arc welding
– resistance welding
– roll welding
– seam welding
– semiautomatic welding
– short-circuited arc welding
– single-pass welding
– single-spot welding
– spot welding
– step welding
– submerged arc welding
– tack welding
– TIG welding
– ultrasonic welding
– underwater welding
– unsupported welding
– uphill welding
– upward welding
– welding apparatus
– welding atmosphere
– welding cable
– welding circuit
– welding current
– welding defect
– welding equipment
– welding fabrication
– welding flux
– welding force
– welding gauge
– welding goggles
– welding gun
– welding heat
– welding iron
– welding jig
– welding machine
– welding metallurgy
– welding on
– welding pass
– welding plant
– welding positioner
– welding practice
– welding process
– welding rod
– welding rods
– welding scale
– welding shop
– welding source
– welding station
– welding timer
– welding tip
– welding torch
– welding tractor
– welding transformer
atomic-hydrogen welding apparatu — атомно-водородный сварочный аппарат
multi-operator welding set — многопостовой сварочный аппарат
multiple-arc welding machine — многодуговая сварочная машина
multiple-spot welding machine — многоточечная сварочная машина
plasma electron-beam welding — электроннолучевая сварка в плазме
single-operator welding machine — однопостовая сварочная машина
single-operator welding set — однопостовой сварочный аппарат
single-operator welding unit — однопостовая сварочная установка
storage-battery percussion welding — <tech.> сварка аккумуляторная
storage-battery welding machine — конденсаторная сварочная машина
two-operator welding unit — двухпостовая сварочная установка
ultrasonic welding machine — устройство ультразвуковой сварки
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58 welding
1) сварка, сваривание, сварочные работы || сварочный2) спайка, спаивание || спайный3) сплавление ( поливинилхлорида)4) геол. слипание, уплотнение, консолидация ( осадков)•- fusion thermit welding - gravity position welding - heated-tool welding - staggered intermittent welding - storage-battery percussion welding - storage-battery welding welding -
59 rectifier
= rect1) выпрямитель2) пп диод•- asymmetric silicon-controlled rectifier
- avalanche rectifier
- avalanche silicon-controlled rectifier
- barrier-film rectifier
- barrier-layer rectifier
- barrier-level rectifier
- battery-charger rectifier
- bias rectifier
- biphase rectifier
- blocking-layer rectifier
- bridge rectifier
- cascade rectifier
- charging rectifier
- chemical rectifier
- cold-cathode rectifier
- contact rectifier
- controlled rectifier
- controlled avalanche rectifier
- controlled mercury-arc rectifier
- copper-oxide rectifier
- copper-sulfide rectifier
- crystal rectifier
- diffused-junction rectifier
- diode rectifier
- dry-disk rectifier
- dry-plate rectifier
- electrolytic rectifier
- electronic rectifier
- fast rectifier
- forward-biased rectifier
- full-wave rectifier
- gas-filled rectifier
- gate-controlled rectifier
- gate-turnoff silicon-controlled rectifier
- germanium rectifier
- glow-discharge rectifier
- glow-tube rectifier
- Gratz rectifier
- grid-controlled rectifier
- grid-controlled mercury-arc rectifier
- GTO silicon-controlled rectifier
- half-wave rectifier
- high-current rectifier
- high-vacuum rectifier
- high-voltage rectifier
- hot-cathode rectifier
- ignitron rectifier
- iron-selenium rectifier
- junction rectifier
- light-activated silicon-controlled rectifier
- linear rectifier
- magnesium-copper sulfide rectifier
- magnitude-controlled rectifier
- mechanical rectifier
- mercury-arc rectifier
- mercury-vapor rectifier
- metallic rectifier
- n-type crystal rectifier
- pendulum rectifier
- planar silicon-controlled rectifier
- point-contact rectifier
- polyphase rectifier
- pool-cathode mercury-arc rectifier
- power rectifier
- p-type crystal rectifier
- punch-through rectifier
- reverse-biased rectifier
- selenium rectifier
- semiconductor rectifier
- silicon rectifier
- silicon-controlled rectifier
- single-phase rectifier
- solid electrolytic rectifier
- tantalum rectifier
- thermionic rectifier
- three-phase rectifier
- thyratron rectifier
- thyristor rectifier
- tungar rectifier
- vacuum-tube rectifier
- vapor rectifier
- vibrating-reed rectifier
- vibrator rectifier
- voltage-doubler rectifier
- voltage-multiplier rectifier -
60 rectifier
1) выпрямитель2) пп. диод•- asymmetric silicon-controlled rectifier
- avalanche rectifier
- avalanche silicon-controlled rectifier
- barrier-film rectifier
- barrier-layer rectifier
- barrier-level rectifier
- battery-charger rectifier
- bias rectifier
- biphase rectifier
- blocking-layer rectifier
- bridge rectifier
- cascade rectifier
- charging rectifier
- chemical rectifier
- cold-cathode rectifier
- contact rectifier
- controlled avalanche rectifier
- controlled mercury-arc rectifier
- controlled rectifier
- copper-oxide rectifier
- copper-sulfide rectifier
- crystal rectifier
- diffused-junction rectifier
- diode rectifier
- dry-disk rectifier
- dry-plate rectifier
- electrolytic rectifier
- electronic rectifier
- fast rectifier
- forward-biased rectifier
- full-wave rectifier
- gas-filled rectifier
- gate-controlled rectifier
- gate-turnoff silicon-controlled rectifier
- germanium rectifier
- glow-discharge rectifier
- glow-tube rectifier
- Gratz rectifier
- grid-controlled mercury-arc rectifier
- grid-controlled rectifier
- GTO silicon-controlled rectifier
- half-wave rectifier
- high-current rectifier
- high-vacuum rectifier
- high-voltage rectifier
- hot-cathode rectifier
- ignitron rectifier
- iron-selenium rectifier
- junction rectifier
- light-activated silicon-controlled rectifier
- linear rectifier
- magnesium-copper sulfide rectifier
- magnitude-controlled rectifier
- mechanical rectifier
- mercury-arc rectifier
- mercury-vapor rectifier
- metallic rectifier
- n-type crystal rectifier
- pendulum rectifier
- planar silicon-controlled rectifier
- point-contact rectifier
- polyphase rectifier
- pool-cathode mercury-arc rectifier
- power rectifier
- p-type crystal rectifier
- punch-through rectifier
- reverse-biased rectifier
- selenium rectifier
- semiconductor rectifier
- silicon rectifier
- silicon-controlled rectifier
- single-phase rectifier
- solid electrolytic rectifier
- tantalum rectifier
- thermionic rectifier
- three-phase rectifier
- thyratron rectifier
- thyristor rectifier
- tungar rectifier
- vacuum-tube rectifier
- vapor rectifier
- vibrating-reed rectifier
- vibrator rectifier
- voltage-doubler rectifier
- voltage-multiplier rectifierThe New English-Russian Dictionary of Radio-electronics > rectifier
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дуга между металлическими электродами — — [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 metallic arc … Справочник технического переводчика
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