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61 ammeter
- digital ammeter
- electrodynamic ammeter
- electron-tube ammeter
- hinged-iron ammeter
- hot-wire ammeter
- induction ammeter
- magnetooptic ammeter
- optical ammeter
- permanent-magnet movable-coil ammeter
- polarized-vane ammeter
- shunt ammeter
- snap-on ammeter
- soft-iron ammeter
- surge-crest ammeter
- thermal ammeter
- thermal-expansion ammeter
- thermocouple ammeterThe New English-Russian Dictionary of Radio-electronics > ammeter
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62 steel
сталь || стальной- abrasion-resistant steel
- acid Bessemer steel
- acid electric steel
- acid open-hearth steel
- acid steel
- acid-resisting steel
- age-hardenable steel
- ageing steel
- aircraft structural steel
- air-hardened steel
- air-hardening steel
- air-melted steel
- alkaliproof steel
- alkali-resistant steel
- alloy steel
- alloy tool steel
- alloyed steel
- alphatized steel
- aluminized steel
- aluminum grain-refined steel
- aluminum steel
- aluminum-coated steel
- aluminum-nickel steel
- aluminum-stabilized steel
- anchor steel
- angle steel
- annealed steel
- anticorrosion steel
- arc-furnace steel
- armco steel
- ausaging steel
- ausforming steel
- austenitic manganese steel
- austenitic Ni-Cr stainless steel
- austenitic stainless steel
- austenitic steel
- austenitic-carbidic steel
- austenitic-intermetallic steel
- automatic steel
- automobile steel
- axle steel
- bainitically heat-treated steel
- balanced steel
- ball bearing steel
- banding steel
- bandsaw steel
- bar steel
- basic Bessemer steel
- basic converter steel
- basic open-hearth steel
- basic oxygen steel
- bearing steel
- bearing-grade steel
- beaten steel
- beryllium steel
- Bessemer steel
- blanking steel
- blister steel
- blue steel
- boiler steel
- boron steel
- bottle-top steel
- bottom-run steel
- bright drawing steel
- bright steel
- bright-drawn steel
- bright-finished steel
- bronze steel
- bulb steel
- bulb-angle steel
- burned steel
- capped steel
- carbon nitrided steel
- carbon steel
- carbon tool steel
- carbonized steel
- carbon-martensite steel
- carbon-molybdenum steel
- carbon-vacuum deoxidized steel
- carburized steel
- carburizing steel
- case-hardened steel
- case-hardening steel
- cast steel
- cemented steel
- chain steel
- chilled steel
- chisel steel
- chrome steel
- chrome-manganese steel
- chrome-molybdenum steel
- chrome-nickel steel
- chrome-nickel-alloy steel
- chrome-nickel-molibdenum steel
- chrome-plated steel
- chrome-tungsten steel
- chrome-vanadium steel
- chromium steel
- chromium tool steel
- chromium-aluminum steel
- chromium-cobalt steel
- chromium-copper steel
- chromium-manganese steel
- chromium-molibdenum steel
- chromium-nickel steel
- chromium-nickel-molybdenum steel
- chromium-silicon steel
- chromium-tungsten steel
- chromium-tungsten-vanadium steel
- chromized steel
- clad steel
- cobalt steel
- cobalt-nickel steel
- coiled steel
- cold work steel
- cold-drawn steel
- cold-heading steel
- cold-rolled steel
- columbium-stabilized steel
- commercial forging steel
- commercial quality steel
- commercial steel
- common steel
- composite steel
- compound steel
- concrete-prestressing steel
- concrete-reinforcing steel
- constructional steel
- consumable electrode vacuum-melted steel
- controlled rimming steel
- converted steel
- converter steel
- copper steel
- copper-bearing steel
- copper-chromium steel
- copperclad steel
- copper-nickel steel
- copper-plated steel
- corrosion-resistant steel
- corrosion-resisting steel
- corrugated sheet steel
- CQ steel
- creep-resisting steel
- crucible steel
- crude steel
- cutlery-type stainless steel
- cyanided steel
- damascus steel
- damask steel
- DDQ steel
- dead-hard steel
- dead-melted steel
- dead-soft steel
- deep drawing quality steel
- deep drawing steel
- deep-hardening steel
- degasified steel
- deoxidized steel
- diamond tread steel
- die steel
- direct-process steel
- dirty steel
- dopped steel
- double-reduced steel
- double-refined steel
- double-shear steel
- drawn steel
- drill steel
- duplex steel
- dynamo sheet steel
- dynamo steel
- easily deformable steel
- EDD steel
- effervescent steel
- electric furnace steel
- electric steel
- electric tool steel
- electrical furnace steel
- emergency steel
- eutectoid steel
- exotic steel
- exposed quality steel
- extra deep drawing steel
- extrafine steel
- extrahard steel
- extrahigh tensile steel
- extrasoft steel
- face-hardened steel
- fagoted steel
- fashioned steel
- fast-finishing steel
- fast-machine steel
- faulty steel
- ferrite steel
- ferritic stainless steel
- ferritic steel
- fiery steel
- figured steel
- file steel
- fine steel
- fine-grained steel
- finished steel
- first quality steel
- flange steel
- flat steel
- flat-bulb steel
- flat-rolled steel
- forge steel
- forged steel
- forging die steel
- forging steel
- free-cutting steel
- free-machining steel
- fully deoxidized steel
- fully finished steel
- galvanized steel
- gear steel
- general purpose steel
- glass-hard steel
- grade steel
- graphitic steel
- graphitizable steel
- gun barrels steel
- gun steel
- Hadfield steel
- half-hard steel
- Halvan tool steel
- hammered steel
- hard cast steel
- hard steel
- hard-chrome steel
- hardened steel
- hard-grain steel
- heat-resistant steel
- heat-treated steel
- heavily alloyed steel
- heavy-fagoted steel
- heavy-melting steel
- hexagonal steel
- high-alloy steel
- high-carbon steel
- high-chromium steel
- high-cobalt steel
- high-creep strength steel
- high-ductility steel
- high-elastic limit steel
- higher-carbon steel
- high-grade steel
- high-hardenability core steel
- high-hardenability steel
- high-manganese steel
- high-nickel steel
- high-permeability steel
- high-quality steel
- high-resistance steel
- high-speed steel
- high-strength low alloy steel
- high-strength steel
- high-sulphur steel
- high-temperature steel
- high-tensile steel
- hollow drill steel
- hot die steel
- hot-brittle steel
- hot-rolled steel
- hot-work steel
- hot-working die steel
- hot-working steel
- HSLA steel
- H-steel
- hypereutectoid steel
- hyperpearlitic steel
- hypoeutectoid steel
- hypopearlitic steel
- Indian steel
- induction furnace steel
- induction vacuum melted steel
- ingot steel
- intermediate-alloy steel
- iron-chromium stainless steel
- irreversible steel
- killed steel
- knife steel
- knife-blade steel
- lead-coated steel
- leaded steel
- lean alloy steel
- ledeburitic steel
- light gage steel
- liquid-compressed steel
- loman steel
- low earing steel
- low-alloy steel
- low-alloyed steel
- low-carbon steel
- low-ductility steel
- low-expansion steel
- low-hardenability steel
- low-hardening steel
- low-manganese steel
- low-nickel steel
- low-phosphorus steel
- low-texture steel
- machine-tool steel
- magnet steel
- mandrel steel
- manganese steel
- manganese-killed steel
- manganese-silicon steel
- maraging steel
- martempering steel
- martensitic steel
- mechanically capped steel
- medium alloy steel
- medium-carbon steel
- medium-hard steel
- medium-strength steel
- medium-temper steel
- merchant steel
- mild steel
- milling steel
- mixed steel
- molybdenum steel
- needled steel
- nickel steel
- nickel-chrome steel
- nickel-chrome-molybdenum steel
- nickel-chromium steel
- nickel-chromium-molybdenum steel
- nickel-clad steel
- nickel-molybdenum steel
- nitrided steel
- nonaging steel
- noncorrosive steel
- nondeforming steel
- nonhardening steel
- nonmagnetic steel
- nonpiping steel
- nonrustic steel
- nonshrinking steel
- nonstrain-aging steel
- normal steel
- octagon steel
- oil-hardening steel
- open-hearth steel
- open-poured steel
- ordinary steel
- oriented steel
- overblown steel
- overheated steel
- over-reduced steel
- oxidation-resisting steel
- paragon steel
- pearlitic steel
- perished steel
- permanent-magnet steel
- PH steel
- piled steel
- pipe steel
- piped steel
- plain carbon steel
- plain steel
- planished sheet steel
- planished steel
- plate steel
- plow steel
- pneumatic steel
- polished sheet steel
- polished steel
- pot steel
- powder metallurgical compacted steel
- powdered metal high-speed steel
- precipitation-hardening steel
- precision steel
- pressure vessel steel
- primary steel
- puddle steel
- puddled steel
- punching steel
- purified steel
- PV steel
- QT steel
- quality steel
- quenched-and-tempered steel
- quick-cutting steel
- quick-speed steel
- rail steel
- railway structural steel
- rapid machining steel
- rapid steel
- raw steel
- red-hard steel
- refined steel
- refining steel
- refractory steel
- reinforcing steel
- rephosphorized steel
- resilient steel
- resulphurized steel
- rimmed steel
- rimming steel
- rising steel
- rivet steel
- rolled section steel
- rolled steel
- roller-bearing steel
- rose steel
- round steel
- rustless steel
- rust-resisting steel
- saw steel
- scrap steel
- screw steel
- secondary steel
- section steel
- selenium steel
- self-hardening steel
- semideoxidized steel
- semifinished steel
- semikilled steel
- shallow-hardening steel
- shape steel
- shear steel
- shearing steel
- sheet steel
- shock-resisting steel
- Siemens-Martin steel
- silchrome steel
- silicon steel
- silicon-killed steel
- silicon-manganese steel
- silver steel
- simple steel
- skelp steel
- slowly cooled steel
- soft steel
- special steel
- special treatment steel
- spheroidized steel
- spotty steel
- spring steel
- stabilized steel
- stainless clad steel
- stainless steel
- standard steel
- stock steel
- strain-aged steel
- stress-relieved annealed steel
- strip steel
- strong steel
- structural steel
- super-corrosion-resistant stainless steel
- superduty steel
- surface-hardening steel
- surgical steel
- tap steel
- tapped-on-carbon steel
- T-bulb steel
- tee-bulb steel
- tempered steel
- tensile strength steel
- ternary steel
- thermostrengthened steel
- Thomas steel
- through-hardening steel
- titanium steel
- titanium-stabilized steel
- tool steel
- Tor steel
- transformation induced plasticity steel
- transformer steel
- treated steel
- TRIP steel
- tube steel
- tungsten steel
- turbohearth steel
- two-ply steel
- tyre steel
- ultrastrong steel
- unkilled steel
- unsound steel
- vacuum carbon deoxidized steel
- vacuum degased steel
- vacuum-cast steel
- vacuum-induction melted steel
- vacuum-remelted steel
- valve steel
- vanadium steel
- water-hardening steel
- wear-resisting alloy steel
- weathering steel
- weld steel
- weldable steel
- welding steel
- wild steel
- wire rope steel
- Wootz steel
- wrought steelEnglish-Russian dictionary of mechanical engineering and automation > steel
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63 cam
1) кулачок, кулачковая шайба; эксцентрик; выступ на распределительном валу, зуб3) копир, лекало5) палец6) кулак; кулачный диск7) шаблон8) горн. рудоразборный стол9) лодыжка ( в кулачных молотах)10) скошенная, криволинейная поверхность детали, действующая на другую деталь•to cam in — включать, вводить в зацепление ( при приводе посредством кулачка)
- actuating cam - adjustable cam - admission cam - barrel cam - belt shifter cam - brake cam - centring cam - compound cam - compression-relief cam - conical cam - control cam - cross-grooved cam - cutting cam - cylinder cam - deflecting cam - disk cam - double-lift cam - double-profile cam - double-track cam - edge cam - exhaust cam - expansion cam - face cam - four-lipped cam - groove cam - guide cam - half-compression cam - half-nut cam - heart cam - ignition cam - inlet cam - inverse cam - leader cam - long-dwell cam - make-and-break cam - master cam - multiple-mounted cam - multiple-track cam - mushroom cam - nut cam - offset cam - oscillating cam - outlet cam - pattern cam - periphery cam - permanent cam - plate cam - push cam - radial cam - rear return cam - releasing cam - relief cam - removable strap cam - return cam - rocker cam - rocking cam - rolling cam - scroll cam - side cam - sliding cam - spherical cam - strap cam - swash plate cam - time cam - toe cam - trigger cam - tri-lobe cam - tripping cam - two-dimensional cam - valve cam - variable-lift cam - wiper cam - yoke camto cam out — выключать, выводить из зацепления
* * *1. кулачок, палец2. копир, шаблон, лекало -
64 fastener
1) крепёжная деталь, крепёжное средство (клей, шуруп, гвоздь и т.п.)2) скоба; держатель;3) пряжка; застёжка4) сцепка; замок; запор; зажим5) соединитель (напр. ремённый)•- expansion fastener - sash fastener - threaded fastener - window fastener* * *крепёжная деталь; зажим; застёжка- compression spring clip fastener
- corrugated fastener
- permanent fasteners
- sash fastener
- temporary fasteners -
65 aluminum paste alloy
сплав на основе алюминиевой пасты (напр. идёт на изготовление элементов для солнечных батарей)- artificial-interstitial alloy - backing alloy - bearing alloy - beryllium-copper-aluminum alloy - body-centered cubic alloy - brass brazing alloy - brazing alloy - metal alloy - castable alloy - casting alloy - cold-worked alloy - columbium alloy - commercial alloy - copper alloy - copper-base alloy - copper-bearing alloy - corrosion-resistant alloy - creep-resistant alloy - difficalt-to-extrude alloy - directionally solidified alloy - disordered alloy - doped alloy - electron-beam-melting alloy - EBM alloy - electron-beam-refining alloy - EBF alloy - electrical-resistance alloy - electroslag refining alloy - ESR alloy - eutectic alloy - face-centered cubic alloy - fancy alloy - fastener alloy - fernico alloy - ferromagnetic alloy - foundry alloy - four-component alloy - free-cutting alloy - free-machining alloy - fusible alloy - gamma-phase alloy - general-purpose alloy - hard-facing alloy - hard-magnetic alloy - hard-superconducting alloy - heat-resisting alloy - heat-treatable alloy - heavy alloy - hexagonal close-packed alloy - high alloy - high-carbon alloy - high-coercitivity alloy - high-density alloy - high-melting-temperature alloy - high-permeability alloy - high-resistance alloy - high-strength alloy - high-temperature alloy - high-tensile alloy - high-yield alloy - homogenized alloy - hypercutectic alloy - hypoeutectoid alloy - interstitial alloy - iron-aluminum alloy - iron-base alloy - iron-bearing alloy - iron-carbon alloy - iron-chromium-cobalt alloy - iron-cobalt alloy - iron-manganese alloy - iron-tin alloy - iron-tungsten alloy - lead alloy - lead-antimony alloy - lead-antimony-tin alloy - light alloy - light alloy disk - light-metal alloy - low alloy - low-carbon alloy - low-ductile alloy - low-expansion alloy - low-melting-point alloy - low-permeability alloy - low-temperature alloy - low-tensile alloy - low-yield alloy - magnesium-base alloy - magnesium-rare earth-zirconium alloy - magnetic alloy - magnetically hard alloy - magnetically soft alloy - magnetic-hardening alloy - master alloy - mushy alloy - nickel-base alloy - nickel-chromium alloy - noncorrosive alloy - non-ferrous alloy - nonheat-treatable alloy - non-refractory alloy - nonscaling alloy - ordered alloy - peritectic alloy - permanent magnet alloy - powder metallurgical alloy - precipitation hardened alloy - preferred-orientation alloy - process alloy - quinary alloy - random alloy - random-orientation alloy - rare-earth alloy - reduction alloy - refractory alloy - resistance alloy - resistance-clement alloy - resistor alloy - row alloys - self-lubricating alloy - semiaustenitic alloy - semiconducting alloy - semiferritic alloy - semihard magnetic alloy - shape-metal alloy - silver brazing alloy - soft magnetic alloy - solder alloy - solid solution alloy - solution-treated alloy - stereotype alloy - strain-hardened alloy - substitution alloy - substitutional alloy - super alloy - superconducting alloy - tailored alloy - tantalum-base alloy - textured alloy - thermocouple alloy - thermomagnetic alloy - tin-base alloy - vacuum-arc-refining alloy - vacuum melted alloy - vacuum-induction-melting alloy - VAR alloy - VIM alloy - virgin alloy - wear-resistant alloy - whisker-reinforced alloy - white alloy - work-hardening alloy - wrought alloy - zinc-base alloyАнгло-русский словарь по машиностроению > aluminum paste alloy
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66 joint
соединение; сочленение; сплетение; связь; стык; узел; разъём; шарнир; шарнирная связь; шов; спай; скрутка; сращивание; замок; II соединять(ся); сочленять(ся); пригонять; уплотнять (сальник и т.п.)- joint angle - joint cap - joint face - joint leakage - joint lever - joint liner - joint of girders - joint of rim - joint packing - joint piece - joint pin - joint plate - joint pliers - joint ring - joint sleeve - joint tongue - joint washer - joint weld - cemented lap joint - circumferential joint - constant-velocity joint - constant-velocity universal ball joint - constant-velocity universal spheric joint - cotter joint - cross joint - curb joint - double-strap joint - fished joint - flush joint - folded-over joint - ground joint - hem joint - high-angle joint - key joint - knee joint - knock-off joint - knuckle joint - knuckle-and-socket joint - laced joint - lap joint - lead joint - lock joint - longitudinal joint - loose tongue joint - married joint - metal-to-metal joint - mortise-dowel joint - muff joint - multiple joint - nipple joint - oil joint - open joint - open-butt joint - open-tee joint - packed joint - packless joint - paving expantion joint - pendulum joint - permanent joint - pin joint - pin-connected joint - pinned joint - pivot joint - plug lap joint - plumbed joint - rail joint - ring joint - rivet joint - riveted joint - rocker joint - screw joint - screwed joint - single-riveted joint - skew joint - sleeve joint - slick joint - sliding joint - slip joint - socket joint - socket-and-spigot joint - spliced joint - stapped joint - straped joint - sweated joint - swing joint - T-joint - tee joint - telescope joint - tenon-dowel joint - threaded joint - toggle joint - tongued-and-grooved joint - transverse joint - triple-riveted joint - turning joint - twist joint - union joint - universal joint - water-sealed joint - wedge joint -
67 function
1) функция, действие || функционировать; действовать- essential functions - routine function - safety-related functions2) функциональное назначение; роль- circuit function - intrinsic function - metering function - primary function - robot function - planning function - service function - support function4) функциональный узел ( машины)5) матем. функциональная зависимость, функция- absolutely additive function - absolutely bounded function - absolutely continuous function - absolutely integrable function - absolutely monotone function - absolutely summable function - absolutely symmetric function - almost complex function - almost continuous function - almost convex function - almost everywhere defined function - almost everywhere finite function - almost invariant function - almost periodic function - almost recursive function - almost separably-valued function - almost separating function - almost universal function - analytically independent function - analytically representable function - approximately differentiable function - asymptotically differentiable function - asymptotically finite function - asymptotically uniformly optimal function - bounded below function - cellwise continuous function - circumferentially mean p-valent function - comparison function - complementary error function - complete analytic function - completely additive function - completely computable function - completely monotone function - completely multiplicative function - completely productive function - completely subadditive function - completely symmetrical function - completely undefined function - complex hyperbolic function - conditional risk function - countably multiplicative function - countably valued function - covariant function - cumulative distribution function - cumulative frequency function - deficiency function - double limit function - doubly periodic function - doubly recursive function - effectively computable function - effectively constant function - effectively decidable function - effectively variable function - elementarily symmetric function - entire function of maximum type - entire function of mean type - entire function of potential type - entire function of zero type - entire rational function - essentially increasing function - essentially integrable function - essentially real function - essentially smooth function - everywhere differentiable function - everywhere smooth function - expansible function - explicitly definable function - exponentially convex function - exponentially decreasing function - exponentially increasing function - exponentially multiplicative function - exponentially vanishing function - finitely mean valent function - finitely measurable function - function of appropriate behavior - function of bounded characteristic - function of bounded type - function of bounded variation - function of complex variable - function of exponential type - function of finite genus - function of finite variation - function of fractional order - function of infinite type - function of integral order - function of maximal type - function of minimal type - function of mixed variables - function of normal type - function of number theory - function of one variable - function of rapid descent - function of rapid growth - function of real variable - general universal function - geometric carrier function - implicitly definable function - incomplete dibeta function - incomplete gamma function - incomplete tribeta function - incompletely defined function - inductively defined function - inductively integrable function - infinitely divisible function - infinitely many-valued function - integral logarithmic function - inverse trigonometric function - inverted beta function - iterative function - joint correlation function - joint density function - linearly separable function - locally bounded function - locally constant function - locally holomorphic function - locally homogeneous function - locally integrable function - locally negligible function - locally regular function - locally summable function - logarithmic generating function - logarithmic integral function - logarithmically infinite function - logarithmically plurisubharmonic function - logarithmically subharmonic function - lower semicontinuous function - monotone non-decreasing function - monotone non-increasing function - multiply periodic function - multiply recursive function - negative definite function - negative infinite function - nontangentially bounded function - normalized function - normed function - nowhere continuous function - nowhere differentiable function - nowhere monotonic function - n-times differentiable function - n-tuply periodic function - numeralwise expressible function - numeralwise representable function - numerical function - numerically valued function - oblate spheroidal function - operating characteristic function - optimal policy function - parametrically definable function - partially symmetric function - piecewise constant function - piecewise continuously differentiable function - piecewise linear function - piecewise monotonic function - piecewise polynomial function - piecewise quadratic function - piecewise regular function - piecewise smooth function - pointwise approximated function - positive homogeneous function - positive infinite function - positive monotone function - positive monotonic function - positive semidefinite function - potentially calculable function - potentially recursive function - power series function - probability generating function - quadratically summable function - rapidly damped function - rapidly decreasing function - rapidly oscillatory function - recursively continuous function - recursively convergent function - recursively defined function - recursively differentiable function - recursively divergent function - recursively extensible function - relative distribution function - relative frequency function - representing function - reproducing kernel function - residual function - residue function - scalarwise integrable function - scalarwise measurable function - sectionally smooth function - simply periodic function - singly recursive function - slowly increasing function - slowly oscillating function - slowly varying function - smoothly varying function - solid spherical harmonic function - solid zonal harmonic function - steadily increasing function - stopped random function - strictly convex function - strictly decreasing function - strictly increasing function - strictly integrable function - strictly monotone function - strongly differentiable function - strongly holomorphic function - strongly integrable function - strongly measurable function - strongly plurisubharmonic function - totally additive function - totally continuous function - totally measurable function - totally multiplicative function - totally positive function - triangular function - uniformly best decision function - uniformly bounded function - uniformly definable function - uniformly differentiable function - uniformly homotopic function - uniformly integrable function - uniformly limited function - uniformly measurable function - uniformly smooth function - unit step function - unitary divisor function - upper measurable function - upper semicontinuous function - weakly analytic function - weakly continuous function - weakly differentiable function - weakly holomorphic function - weakly measurable function - weakly singular function - weighted random functiondomain of a function — область определения функции, область изменения независимой переменной
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68 PAM
PAM, partial mobilization (expansion plan)————————PAM, partial mobilization————————PAM, payload assist module————————PAM, permanent active militia————————PAM, personnel accounting management————————PAM, personnel action memorandum————————PAM, Phoenix airborne missileавиационная ракета "Феникс"————————PAM, planning, activation, modificationпланирование, ввод в строй, модификация————————PAM, post-acceptance modification————————PAM, priorities and allocations manual————————PAM, procurement aids man————————PAM, procurement of aircraft and missilesзакупки самолетов, вертолетов и ракетEnglish-Russian dictionary of planing, cross-planing and slotting machines > PAM
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69 effects of the electric arc inside switchgear and controlgear assemblу
- 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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