-
1 heating on points
Железнодорожная сигнализация: обогрев стрелок -
2 system
1) система; сеть; комплекс2) установка, устройство3) план; расположение4) система; порядок; классификация•- system of catalogs - system of catalogues - system of forces - system of ground points - system of road signs - system of scaffolds - acoustic signalling system - active residential solar heating system - aeration system - air-brake system - air-comfort system - air-conditioning system - air-curtain system - air-foam system - airline system - airline vacuum system - air-pressure water system - all-outside air-conditioning system - arch system - arch-and-pier system - audible alarm system - Automated Data Management System in Building - ADMSB - automatic fire alarm system - balanced system of ventilation - bar system - basic system - beam system - blower system - British absolute system of units - building system - building central air conditioning system - building solar optical system - bypass pipe system - cable system - cantilever tieback system - cathodic protection system of pipelines - central fan electric heating system - central hot water supply system - check-board system - circulating water system - closed system - closed heat supply system - closed pipeline system - collecting system - colour spraying systems - combined extract-and-input system - combined sewerage system - community complete system in containers or skids - composite cable roof system - compressed-air system - computer-aided system - consolidated power system - control system of survey - cooling system - cooling pipe system - coordinate system - curing system - decimal system - designation system - discrete system - discrete-continual system - distributing system - district heating system - double-pipe system - double-pipeline system - double-pipe riser system - downward system of ventilation - drainage system - drencher system - drop system - dry pipe sprinkler system - dry return system - duct system - earthling system - ejector system - elastic system - electric heating system - embedded panel system - emergency power supply system - energy recovery system - engineer's system of units - filling system of navigation lock - filtration system - fire-alarm sounding system - fire-fighting system - fire-sprinkling system - fire warning system - fixing systems - flange system - flooding system - floor system - floor system of bridge - floor heating system - flow-through system - flue gas cleaning system - fluid power system - forced circulation system - four-axis system - framed system - gas heating system - glaze systems - gravity system - gravity water supply system - grid system - hazard system - heating system - heat pump system - heat supply system - high pressure air-conditioning system - high velocity air-conditioning system - hinged system - hoisting system - hot air system - hot blast system - hot water supply system - inflation system - instantaneously variable system - integral deck system - integrated dispatching system - invariable system - ion-exchange system - irrigation system - land system - large public water system - lateral system - left-handed system - lighting system - local air-conditioning system - lock-filling system - long-line system - low pressure air-conditioning system - low velocity air-conditioning system - low voltage system - main system - management system - measuring system - mechanical systems of a house - medium-size public water system - membrane system - metric system - modular coordinating space system - monitoring system - multistage gas supply system - network system - observing system - once-through system - one-layer cable system - one-pipe heating system - one-pipe loop system - open system - open heat supply system - open return system - overhead system of heating - overhead heating system - panel air system - panel cooling system - pipeline system - piping system - plane system - plumbing system - pollution control system - population settlement group system - post-tensioned system - potabilization system - power system - power-reservoir system - pressurized water treatment system - pre-tensioned system - primary system - public transport system - public water system - public waterworks system - quality control system - quarternary system - railroad system - recirculated heating system - recirculation duct air conditioning system - recool system - rectangular system of street layout - reliability coefficients system - remote control system - reusing water supply system - rigid cable roof system - ring heating system - roll-cap system - round duct system - safety valve of a hydraulic system - saprobity system - separate sewerage system - septic system - sewerage system - single duct air-conditioning system - single-stage system - single-track automatic block system - slab-stringer system - smoke-detector system - solar aquatic system - solar cooling system - solar heating system - solar thermal power system - space system - split system - sprinkler system - statically determinate system - statically indeterminate system - steel plate system - structural system - supply air system - suspension system - thermal reheat system - three-dimensional system - three-way system of reinforcement - thrust system - total energy system - two-dimensional system - two-duct air-conditioning system - two-layer cable roof system - two-pipe water heating system - underfloor heating system - underground cable system - unified modular coordination system - universal sewerage system - upfeed water heating system - up-lighting system - utility system - utility detection system - vacuum system - vandalproof system - variable air volume system - ventilation system - warning system - waste treatment system - waste water system - water system - water measuring systems - water purification system - water quality system - water quality indicator system - water supply system - water supply by zones system - water treatment systems - wind bracing system - zone system* * *1. система; сеть (напр. трубопроводов); устройство2. способ, метод- system of forcessystem in equilibrium — равновесная система, система в состоянии равновесия
- system of masses
- system of scaffolds
- ABC system
- AC system
- acoustical ceiling system
- active solar energy system
- aesthetic value system
- air classification system
- air cycle refrigerating system
- airfield soil classification system
- air pollution control system
- air-to-air system
- air-to-water system
- air transport system
- alarm system
- all-air system
- all outside air system
- all-water coil system
- all water fan coil system
- approach lighting system
- arterial system
- Atterberg soil classification system
- audio alarm system
- automated casting system
- automatic fire alarm system
- automatic fire protection system
- automatic flushing system
- balanced system
- balanced system of streets
- balanced ventilation system
- bar system
- beam structural system
- bell alarm system
- Benoto piling system
- bivalent heat pump system
- bleed-in system
- blow and exhaust system
- blow through air-conditioning system
- blow through fan system
- bootstrap system
- box system
- bridge deck structured system
- British soil classification system
- building system
- building automation system
- building-drainage system
- building gravity drainage system
- building management system
- built-in dust suppression system
- burglar alarm system
- cable system
- central air heating system
- central fan system
- centralized hot-water supply system
- central plant air conditioning system
- changeover system
- circulating system
- circulation water supply system
- circulation water system
- closed system
- closed heat-supply system
- closed-loop heat pump system
- closed-type steam heating system
- coding system
- cogeneration system
- cold supply system
- collapsing-ring bridge rail system
- combined drainage system
- combined sewage system
- complanar system of structural members
- complanar force system
- complete-mix activated sludge system
- composite frame system
- compression system
- concrete suspended flooring system
- constant volume system
- continuous conveying system
- continuous suspension system
- control system
- cooling system
- coordinate system
- cost-efficient floor system
- crossbar approach lighting system
- cross blow ventilation system
- curtain walling system
- custom forming system
- decentralized air conditioning system
- decentralized sewerage system
- deluge sprinkler system
- desiccant cooling system
- designation system
- design-built system
- diffusion-absorption system
- digital indicating system
- direct system
- direct air heating system
- direct cooling system
- direct expansion system
- direct hot water system
- direct hot-water supply system
- direct return system
- direct through air-conditioning system
- distribution system
- domestic hot water system
- domestic sewerage system
- "Dot" recording system
- double-pipe system
- double stack system
- down-feed system
- drainage system
- draw-in system
- draw-through fan system
- draw-through system
- drencher system
- drop system
- dry-pipe sprinkler system
- dual conduit system
- duct system
- ductless split air conditioning system
- dust collecting system
- dust extract system
- early warning system
- economical floor system
- ejector refrigerating system
- elastic mechanical system
- elastic system
- electric heating system
- electric reheat system
- energy management system
- environmental system
- exhaust system
- extract system
- FAA soil classification system
- fan coil system
- Federal aviation administration soil classification system
- fire alarm system
- fire-extinguishing system
- fire protection system
- flat plate-pipe column floor system
- floor structural system
- floor system
- flow-through system
- F-number system
- force system
- forming-and-reinforcing system
- Forton system
- four pipe system
- gantry crane system
- gas heating system
- gravity system
- gravity-flow heating system
- gravity sewerage system
- gravity steam heating system
- gravity water-supply system
- grid coordinate system
- gridiron distribution system
- grounding system
- groundwater control system
- group water supply system
- gyratory system
- heat distribution system
- heating system
- heat-of-light system
- heat pump system
- heat recovery system
- heat supply system
- heat-traced system
- high-intensity lighting system
- high temperature hot-water heating system
- high velocity system
- hold-over system
- holonomic system
- hot-air system
- hot water system
- hot-water circulation system
- hush piling system
- hybrid system
- hydraulic control system
- hydrophilic system
- hydrophobic system
- indirect expansion system
- indirect hot-water supply system
- indirect refrigeration system
- individual sewage-disposal system
- induction air conditioning system
- induction system
- industrialized building systems
- inflation system
- instrument landing system
- integral deck system
- integrated distribution floor system
- inverter driven VRV system
- Jackson system
- land system
- large panel system
- lighting system
- line system
- liquid overfeed system
- local sewerage system
- low-pressure system
- low pressure hot water system
- low velocity system
- main system
- maintenance management system
- mass transit system
- materials-handling system
- mechanical system
- mechanical refrigerating system
- mechanical supply system
- medium pressure hot water system
- medium temperature hot water system
- microbore heating system
- modular system
- modular air conditioning system
- modular compression sealing system
- modular decking system
- modular precast building system
- multiple-degree system
- multiple web system
- multiple well system
- multistage gas-supply system
- multizone system
- municipal piping system
- nail-free formwork system
- non-changeover system
- octopus duct system
- oil fired heating system
- once-through water-supply system
- one-degree system
- one-duct air-conditioning system
- one-pipe system
- one-pipe loop system
- one-way system
- open system
- open expansion tank system
- open-loop control system
- open return system
- open steam heating system
- operation system
- overhead heating system
- overhead runway system
- packaged cogeneration system
- panel air-conditioning system
- panel air system
- panel-lock system
- partially-separate system
- piping system
- plane system of forces
- plane grid system
- plenum system
- plumbing system
- pneumatic conveying system
- post-tensioning system
- preaction sprinkler system
- prefabricated pipe conduit system
- pressurization system
- pressurized heating system
- pressurized hot water system
- primary-secondary system
- principal system
- public system
- public waterwork system
- push-through fan system
- push-through system
- quality system
- rail mounted track laying system
- raised floor system
- rapid transport system
- recool system
- recycling system
- recycling water system
- redundant bridge system
- refrigerating system
- regenerative air cycle system
- regional settlement system
- reheat system
- return system
- return air system
- reverse return system
- reverse return upfeed system
- rising heating system
- road system
- roofing system
- run-around system
- safety system
- scraper system
- sealed heating system
- security system
- self-climbing form system
- separate sewerage system
- separate system
- series loop system
- sewage system
- shunt system
- single-degree-of-freedom system
- single-degree system
- single duct air conditioning system
- single-pipe heating system
- single-pipe heat-supply system
- single-stack plumbing system
- single-storey heating system
- single web system
- single-zone air-conditioning system
- slab-stringer system
- small bore heating system
- smoke control system
- smoke extract ventilation system
- soil system
- soil absorption system
- solar heating system
- solid fuel heating system
- split system
- sprinkler system
- state plane coordinate system
- statically determinate system
- statically indeterminate system
- stationary system of loads
- steam heating system
- steel plate system
- storm sewer system
- structural system
- structural monitoring system
- sub-atmospheric heating system
- subbuilding drainage system
- subsurface drainage system
- subsurface sewage disposal system
- supply air system
- supporting formwork system
- suspension structural system
- swing joint system
- taxiway system
- telpher system
- terminal reheat system
- thermal storage heating system
- thermosiphon system
- three-pipe system
- three-pipe air-conditioning system
- three-pipe heat supply system
- total energy system
- track laying system
- trench shoring system
- trussed system
- truss-supported deck system
- tube cleaning system
- two-degree-of-freedom system
- two-degree system
- two-pipe system
- two value system of proportional balancing
- two value system
- two-way system
- underfloor conduit system
- unvented system
- up-feed heating system
- utility detection system
- vacuum heating system
- vacuum return system
- vacuum waste disposal system
- variable air volume system
- variable refrigerant volume system
- variable volume system
- variable water volume system
- VAV system
- vented system
- ventilation system
- VRV system
- VWV system
- warning system
- water-air heating system
- water booster system
- water-supply system
- water-to-air system
- water-to-water system
- wellpoint system
- wet return system
- wind framing system
- wire cable control system
- wiring system
- zoned system
- zone reheat system -
3 method
1) метод; способ; средство2) система; порядок3) технология4) методика•- method of applying liquid lubrication - method of calculation - method of column analogy - method of comparison - method of connecting - method of determining bending moments by fixed points - method of directions - method of elastic arch - method of elastic weights - method of electric needles - method of exchange of members - method of firing - method of fixed points - method of images - method of initial parameters - method of joints - method of least squares - method of least work - method of limit equilibrium - method of minimum strain energy - method of moments - method of movement - method of operation - method of payment - method of planning - method of production - method of redundant reactions - method of rotations - method of sections - method of separate joint displacement - method of slopes - method of stowage - method of strain measurement method - method of substitute redundant members - method of successive approximations - method of successive corrections - method of training - method of transportation - method of working - method of zero moment points - methods of network planning and control - ad hoc method - advertising method - aero-projection method - air-permeability method - airslide method - approximation method - arbitrary proportions method - area moment method - artificial islands method - ball method of testing - bench method - bidding methods - brush method of treatment timber - building methods - caisson method - cantilever method of design - cassette method of production of thin-slab structures - central mixing method - centre drift method - centrifuge method - centroidal method of design - change-in-stress method - chemical injection method - closed building method - column analogy method of design - compressed-air method of tunnelling - concrete testing method - cone method - construction works quality control method - core-drill method - correlation method - cut-and-cover method - cut-and-try method - cylinder method - deflection method - design methods - development method - dip method - dipping method of treatment timber - effective method - electrolytic method - emulsified-asphalt penetration method - energy method - equal load increments method - equal strain method - error method - fabrication method - fixing method - float and chains method - flow-line conveyer method - force method - graphical method - heading method of tunnelling - hot-air heating standpipe method - hot penetration method - hydraulic fill method - impact method - kinematic method - lacquer film method - land-assembly methods - lift-slab method - limit equilibrium method - limit stage design method - line production method - loading method - magnaflux method - mechanical method by pumps - membrane method of waterproofing - mixed-in-place method - mock-up methods of design - modular ratio method - moire fringe method - moment area method - moment-distribution method - moment-of-inertia method of designing - mud-jack method - mulch method - near end moment distribution method - neutral-points method - non-destructive testing methods - normal method - packing methods - patented method of construction - penetration method - percussive pneumatic method of riveting - photo-elastic method of stress-determination - photo-elasticity method - pilot method - pilot tunnel method - pin-and-string method - pipe-bridge method - plastic method of design - plastic theory method - polarized light method - portal method of design - pounding method of curing concrete - production line method of construction - qualitative methods - quantitative methods - relaxation method - ring-and-ball method - rolled-on method - safe method of heat insulation - safety methods - sampling method - sand-bearing method of testing clay pipes - sand-island method - scheduling method - seismic method of prospecting - simultaneous construction method - slope deflection method - spatial self-fixation erection method - statistical analysis method - stovepipe pipe-laying method - strain-energy method - successive construction method - surface-coating method of waterproofing - synthetic method of restoration - thixotropic liquid method - tilt-up method - top-heading method - transfiguration method - trial-load method - turnover method - ultimate-strength method - ultrasonic pulse velocity method - void method of proportioning - volume method of concrete mix design - volumetric method - water-jet method of pile-driving - weight method - well-point method of excavation - work method - working stress method of design* * *метод, способ; система; порядок; методика; технология- method of analysis
- method of application
- method of attack
- method of bearing and distances
- method of bipolar coordinates
- method of calculation
- method of design
- method of detail survey
- method of elastic weights
- method of electric needles
- method of expansion into series
- method of fixed points
- method of intersection
- method of joint isolation
- method of least work
- methods of manufacture
- method of minimum strain energy
- method of moment distribution
- method of radiation
- method of redistribution of pressure
- method of sections
- method of steam jet
- methods of structural analysis
- method of successive approximations
- methods of testing
- method of water needles
- accepted method of building
- accepted method of house construction
- accurate method of analysis
- adhesive nail-on method
- admittance method
- advanced methods of concreting
- advance slope method
- aggregate exposure method
- air permeability method
- alternate methods
- American method
- analytical method of determining reactions
- API method of pile design
- approximate method
- approximation method
- area method
- area-moment method
- assembly methods
- Austrian method
- autogenous curing method
- balanced cantilever method
- Belgian method
- Benoto method
- bentonite method
- Billner method
- "bin" method
- boiling water method
- boom placement concreting method
- bricklaying methods
- building method
- building block module method
- cable method of rock stressing
- calculation method
- cantilever method
- Chicago method
- circular-arc method
- Coast-Survey method
- collapse method of structural design
- combined finite strip-finite element method
- compaction methods of clays
- conjugate beam method
- consistency measurement method
- construction methods
- construction and erection methods
- contiguous pile method
- continuous-flight augers method
- continuous-sample method of advance
- convergence method
- critical method
- critical path method
- Cross moment distribution method
- Cross method
- cross-section method
- current design methods
- cut-and-cover method
- dampproofing methods
- displacement method
- displacement method of advance
- dual-rail method
- dummy unit-load method
- dust-spot method
- Dutch cone method
- earth pressure balanced tunneling method
- elastic center method
- elastic weights method
- electric analogy method
- electric resisting method
- energy method
- equal friction method of duct sizing
- equal friction method
- equivalent load method
- erection method
- fast track construction methods
- fatigue test method
- finite difference method
- finite element method
- finite strip method
- flight auger method
- flotation caisson method
- flue loss method
- folded plate method of analysis
- force method
- free cantilever method of construction
- general method of analysis
- Glotzl hydraulic cell method
- Gow method
- Hardy Cross method
- housing appraisal method
- in-duct method
- industrialized methods of construction
- iterative method
- jack method
- jacking method
- lacquer curtain coating method
- laser beam method
- leap-frog method
- limit equilibrium method
- limit state method
- listening methods
- load factor design method
- mandrel method
- mathematical method of design
- matrix method of structural analysis
- maturity method
- measuring method
- mixed-mode method
- mix-in-place method
- modern building methods
- modular ratio method
- moiré fringe method
- moment-balance method
- nondestructive methods of tests
- normal method of quality control
- null method
- numerical method
- one-rail method
- optical square method
- permissible stress method
- phototheodolite method
- plastic methods of structural analysis
- plate count method
- precast concrete manufacturing methods
- pressuremeter method
- proven construction methods
- p-y method of pile design
- rapid test method
- ratio method of balancing
- rebound hammer method
- reference point method
- relaxation method
- reproducible methods
- resistivity method
- resonant-frequency method
- reverberant field method
- Rockwell method of hardness testing
- safe method
- safe working methods
- secant interlocking pile method
- secant pile method
- seismic method of surveying
- seismic reflection method
- seismic refraction method
- semiprobabilistic design method
- shear transfer method
- shock response method of pile testing
- sliding-wedge method
- slope deflection method
- solar radiation method
- sonic method
- special method of quality control
- standard test method
- static regain method of duct sizing
- static regain method
- statistical design method
- step-by-step method
- strength design method
- strength evaluation method
- successive approximations method
- suspended cantilever method
- swamp shooting method
- Tagg method
- tangent modulus method
- test methods
- Theis method
- thixotropic liquid method
- three-point method
- tilt-up method
- time-saving method of construction
- TNO method of analysis
- TNO method of pile testing
- transit and stadia method
- tremie method
- truss analogy method
- turn-of-nut method
- ultrasonic pulse velocity method
- vacuum concrete method of bridge construction
- valveless pulse-jet method
- vane shear method
- velocity reduction method of duct sizing
- velocity reduction method
- vibratory method
- Vickers method of hardness testing
- volume method of measuring aggregates
- warm water method
- water fog spray method
- western bricklaying method
- western method
- working-stress design method -
4 set
2) телевизионный приёмник, телевизор3) станция; установка; аппарат; устройство4) набор; комплект; группа; партия; серия5) множество; совокупность6) установка; регулирование; настройка || устанавливать; регулировать; настраивать7) вчт установка в состояние "1" || устанавливать в состояние "1"8) задание; назначение || задавать; назначать10) (психологическая) установка, предрасположенность к определённым действиям в определённой ситуации•- set of generating elements
- set of order statistics
- set of restrictions
- airborne radiometry set
- answer relay set
- antisidetone telephone set
- ASCII character set
- AT command set
- automatic telephone set
- automatic transistor test set
- automatic zero set
- balancer set
- beacon portable set
- bifurcation set
- bridging set
- built-in set
- cache set
- call-back telephone set
- carried set
- carrier set
- catastrophe set
- character set
- checkpoint data set
- chip set
- ciphering mode set
- coded character set
- coin-box set
- color TV set
- common-battery set
- compatible sets
- complete instruction set
- complex instruction set
- concatenated data set
- core set
- core set of modulation protocols
- core-logic chip set
- cradle set
- crystal set
- customer set
- cylinder set
- data set
- dial telephone set
- disjoint sets
- disjunctive set
- ECH set
- eddy-current heating set
- empty set
- extension set
- fault set
- four-wire terminating set
- fractal set
- fuzzy set
- handset telephone set
- Hayes command set
- Horn-convex set
- hybrid set
- independent set of lines
- independent set of points
- information set
- infrared-communications set
- instruction set
- interval-valued fuzzy sets
- invariant set
- Julia set
- key set
- lexicographically ordered set
- line data set
- local-battery telephone set
- loran set
- machine-instruction set
- magneto telephone set
- Mandelbrot set
- manual telephone set
- mask set
- master mask set
- membership set
- microprocessor set
- microprogram set
- model set
- modulized integrated-circuit TV set
- motor-generator set
- noise-measuring set
- normal set
- null set
- operator's head set
- paging telephone set
- Pareto set
- partitioned data set
- pointed-valued fuzzy sets
- push-button set
- radio set
- receiving set
- recurrent set
- reduced instruction set
- resolvent set
- ringing set
- satellite communication set
- self-affine fractal set
- sequential data set
- sferics set
- sidetone telephone set
- single-byte character set
- singleton set
- sound-powered telephone set
- spring set
- staff set
- stripe set
- structured set
- subaudio telegraph set
- subnormal set
- subscriber set
- tail warning radar set
- telegraph set
- telephone set
- telephone data set
- television set
- term set
- terminal set
- terminating set
- test set
- training set
- transistor TV set
- transmission distortion measuring set
- transmission measuring set
- TV set
- uncountable set
- unimodal set
- unitized TV set
- universal character set
- universal multiple-octet coded character set
- users set
- validation set
- vertex set
- volume set
- Zermelo set
- zero set -
5 set
2) телевизионный приёмник, телевизор3) станция; установка; аппарат; устройство4) набор; комплект; группа; партия; серия5) множество; совокупность6) установка; регулирование; настройка || устанавливать; регулировать; настраивать7) вчт. установка в состояние "1" || устанавливать в состояние "1"8) задание; назначение || задавать; назначать10) (психологическая) установка, предрасположенность к определённым действиям в определённой ситуации•- answer relay set
- antisidetone telephone set
- ASCII character set
- AT command set
- automatic telephone set
- automatic transistor test set
- automatic zero set
- balancer set
- beacon portable set
- bifurcation set
- bridging set
- built-in set
- cache set
- call-back telephone set
- carried set
- carrier set
- catastrophe set
- character set
- checkpoint data set
- chip set
- ciphering mode set
- coded character set
- coin-box set
- color TV set
- common-battery set
- compatible sets
- complete instruction set
- complex instruction set
- concatenated data set
- core set of modulation protocols
- core set
- core-logic chip set
- cradle set
- crystal set
- customer set
- cylinder set
- data set
- dial telephone set
- disjoint sets
- disjunctive set
- ECH set
- eddy-current heating set
- empty set
- extension set
- fault set
- four-wire terminating set
- fractal set
- fuzzy set
- handset telephone set
- Hayes command set
- Horn-convex set
- hybrid set
- independent set of lines
- independent set of points
- information set
- infrared-communications set
- instruction set
- interval-valued fuzzy sets
- invariant set
- Julia set
- key set
- lexicographically ordered set
- line data set
- local-battery telephone set
- loran set
- machine-instruction set
- magneto telephone set
- Mandelbrot set
- manual telephone set
- mask set
- master mask set
- membership set
- microprocessor set
- microprogram set
- model set
- modulized integrated-circuit TV set
- motor-generator set
- noise-measuring set
- normal set
- null set
- operator's head set
- paging telephone set
- Pareto set
- partitioned data set
- pointed-valued fuzzy sets
- push-button set
- radio set
- receiving set
- recurrent set
- reduced instruction set
- resolvent set
- ringing set
- satellite communication set
- self-affine fractal set
- sequential data set
- set of equations
- set of generating elements
- set of order statistics
- set of restrictions
- sferics set
- sidetone telephone set
- single-byte character set
- singleton set
- sound-powered telephone set
- spring set
- staff set
- stripe set
- structured set
- subaudio telegraph set
- subnormal set
- subscriber set
- tail warning radar set
- telegraph set
- telephone data set
- telephone set
- television set
- term set
- terminal set
- terminating set
- test set
- training set
- transistor TV set
- transmission distortion measuring set
- transmission measuring set
- TV set
- uncountable set
- unimodal set
- unitized TV set
- universal character set
- universal multiple-octet coded character set
- users set
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- vertex set
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- zero setThe New English-Russian Dictionary of Radio-electronics > set
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6 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.
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Англо-русский словарь нормативно-технической терминологии > electric arc phenomenon
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