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1 localized field
Электроника: локализованное поле -
2 localized field
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3 localized field
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4 localized field
The New English-Russian Dictionary of Radio-electronics > localized field
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5 localized field
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6 field
1) поле (1. физическое поле (напр. электромагнитное) 2. величина, характеризующая физическое поле 3. (открытое) пространство; область; зона 4. тлв вчт полукадр (в системах отображения с чересстрочной развёрткой) 5. вчт поименованная группа данных; элемент данных; столбец данных 6. вчт обрабатываемая отдельно группа разрядов 7. вчт кольцо с ненулевыми элементами, образующими абелеву группу по операции умножения 8. сфера деятельности; область интересов) || полевой; относящийся к полю2) опт. поле зрения4) рлк карта местности ( на экране индикатора)5) полигон6) поле боя (напр. в компьютерных играх)•- fields of atom
- field of complex numbers
- field of events
- field of force
- field of functions
- field of order N-
- field of quotients
- field of relations
- field of search
- field of selection
- field of values
- field of view
- field of vision
- field without sources
- field without vortices
- field with sources
- field with vortices
- Abelian field
- ac field
- accelerating field
- acoustoelectric field
- address field
- affine field
- aiding drift field
- alphanumeric field
- alternate fields
- alternating-gradient field
- angular field of view
- anisotropy field
- antenna field
- aperture field
- applied field
- authentication field
- auxiliary field
- avalanche field
- axial field
- backscattered field
- backward field
- base field
- base sweeping field
- bias magnetic field
- biasing magnetic field
- biomagnetic fields
- bit field
- block information field
- blue field
- breakdown field
- built-in field
- calculated field
- canonical field
- card field
- caustic field
- central field
- chain field
- character field
- charge-separation field
- chiral field
- circuital field
- coercive field
- collapse field
- color field
- compressing field
- computed field
- confining field
- conservative field
- constant field
- containing field
- control field
- Coulomb field
- countable field
- counterrotating field
- coupled fields
- critical field
- CRC field
- crossed fields
- crystal field
- crystal lattice field
- crystalline field
- curl field
- curling field
- cusped magnetic field
- cutoff field
- cyclic redundancy check field
- cylinder number field
- data field
- dc field
- decelerating field
- deflection field
- degaussing field
- demagnetizing field
- derived field
- destination field
- diffracted field
- dipole field
- dipole sound field
- display field
- disturbed field
- disturbing field
- domain erasing field
- domain nucleation field
- drift field
- dynamic field
- dynamic threshold field
- E-field
- Earth's electric field
- Earth's magnetic field
- edge diffracted field
- effective field
- effective field of magnetic anisotropy
- electric field
- electromagnetic field
- electrostatic field
- EM field
- emit field
- entrance field
- equilibrium field
- erasure field
- even field
- evoked magnetic fields of brain
- exchange field
- extension field
- external field
- extraneous field
- far field
- far-radiated field
- far-scattered field
- far-zone field
- Fermat field
- file field
- finite field
- first field
- first critical field
- fixed-length field
- flag field
- focusing field
- force-free magnetic field
- forward field
- frame number field
- Fraunhofer field
- free field
- free-space field
- Fresnel field
- fringing field
- fringing field of junction
- frozen field
- gage field
- Galois field
- Galois field pn
- gate-to-drain field
- geometrical optics field
- gradient field
- gravitational field
- green field
- guide field
- guiding field
- H-field
- halaxy magnetic field
- Hall field
- Hall electric field
- harmonic field
- head number field
- heating field
- heating electric field
- helical field
- heliotron magnetic field
- high-frequency field
- holographically reconstructed field
- homogeneous field
- hyperfine field
- I-field
- ID field
- identifier field
- illuminating field
- impressed field
- incident field
- inducing field
- induction field
- infinite field
- information field
- inhomogeneous field
- in-plane field
- instruction field
- integer field
- interlaced field
- internal field
- interplanetary magnetic field
- irrotational field
- jack field
- junction field
- Kerr field
- key field
- label field
- lamellar field
- laser field
- lateral field
- leakage field
- local field
- localized field
- local receptive field
- macroscopic field
- magnetic field
- magnetic fields of eye
- magnetic bias field
- magnetic mirror field
- magnetization reversal field
- magnetizing field
- magnetostatic field
- magnetron critical field
- maximum permeability field
- Mersenne field
- message field
- microscopic field
- mirror field
- modulating field
- modulation field
- molecular field
- monochromatic field
- multibeam field
- multidimensional field
- near field
- near-zone field
- noise field
- noncircuital field
- nonstationary field
- nonuniform field
- normal-mode field
- nucleation field
- numeric field
- nutation field
- object field
- odd field
- orderable field
- ordered field
- operand field
- operation field
- particle switching field
- penumbra field
- periodic field
- perpendicular critical field
- perturbed field
- physical optics field
- piezoelectric field
- polarization field
- poloidal field
- potential field
- primary color field
- prime field
- privilege field
- proper field
- protected field
- pseudoscalar field
- pump field
- pumping field
- punched-card field
- quadrupolar field
- quadrupolar field with X neutral point
- quadrupolar field with X -type neutral point
- quantum field
- quasi-potential field
- quotent field
- radial field
- radiated field
- radiation field
- radio-frequency field
- radio influence field
- reactive field
- receptive field
- reconstructed field
- red field
- rediffracted field
- reference field
- reflected field
- repeating field
- reradiated field
- residual field
- residue class field
- resonance field
- retarding field
- RF field
- rotating field
- rotational field
- satellite's field of view
- scalar field
- scattered field
- second field
- second critical field
- sector number field
- seed field
- self-consistent field
- shadow field
- shaping field
- signal field
- skipped field
- solenoidal field
- sort field
- sound field
- source field
- source-to-drain field
- space-charge field
- spinor field
- spontaneous magnetic fields of brain
- starting field
- static field
- stationary field
- stochastic field
- stray field
- superposed field
- surface superconducting field
- sweeping field
- switching field
- symbol field
- tag field
- television field
- tensor field
- thermal field
- thermal radiation field
- third critical field
- threshold field
- topological field
- transient field
- transition field
- trapped field
- traveling field
- tunneling field
- two-turn field
- uniform field
- unit electric field
- unperturbed field
- vanishing field
- variable field
- variable-length field
- variant field
- vector field
- visual field
- vortex field
- wall creation field
- wave field
- waveguide field
- write field
- zero-approximation field -
7 field
1) поле (1. физическое поле (напр. электромагнитное) 2. величина, характеризующая физическое поле 3. (открытое) пространство; область: зона 4. тлв.; вчт. полукадр (в системах отображения с чересстрочной развёрткой) 5. вчт. поименованная группа данных; элемент данных; столбец данных 6. вчт. обрабатываемая отдельно группа разрядов 7. вчт. кольцо с ненулевыми элементами, образующими абелеву группу по операции умножения 8. сфера деятельности; область интересов) || полевой; относящийся к полю2) опт. поле зрения4) рлк. карта местности ( на экране индикатора)5) полигон6) поле боя (напр. в компьютерных играх)•- ac field
- accelerating field
- acoustoelectric field
- address field
- affine field
- aiding drift field
- alphanumeric field
- alternate fields
- alternating-gradient field
- angular field of view
- anisotropy field
- antenna field
- aperture field
- applied field
- authentication field
- auxiliary field
- avalanche field
- axial field
- backscattered field
- backward field
- base field
- base sweeping field
- bias magnetic field
- biasing magnetic field
- biomagnetic fields
- bit field
- block information field
- blue field
- breakdown field
- built-in field
- calculated field
- canonical field
- card field
- caustic field
- central field
- chain field
- character field
- charge-separation field
- chiral field
- circuital field
- coercive field
- collapse field
- color field
- compressing field
- computed field
- confining field
- conservative field
- constant field
- containing field
- control field
- Coulomb field
- countable field
- counterrotating field
- coupled fields
- CRC field
- critical field
- crossed fields
- crystal field
- crystal lattice field
- crystalline field
- curl field
- curling field
- cusped magnetic field
- cutoff field
- cyclic redundancy check field
- cylinder number field
- data field
- dc field
- decelerating field
- deflection field
- degaussing field
- demagnetizing field
- derived field
- destination field
- diffracted field
- dipole field
- dipole sound field
- display field
- disturbed field
- disturbing field
- domain erasing field
- domain nucleation field
- drift field
- dynamic field
- dynamic threshold field
- E field
- Earth's electric field
- Earth's magnetic field
- edge diffracted field
- effective field of magnetic anisotropy
- effective field
- electric field
- electromagnetic field
- electrostatic field
- EM field
- emit field
- entrance field
- equilibrium field
- erasure field
- even field
- evoked magnetic fields of brain
- exchange field
- extension field
- external field
- extraneous field
- far field
- far-radiated field
- far-scattered field
- far-zone field
- Fermat field
- field of algebraic numbers
- field of complex numbers
- field of events
- field of force
- field of functions
- field of order N
- field of quotients
- field of relations
- field of search
- field of selection
- field of values
- field of view
- field of vision
- field with sources
- field with vortices
- field without sources
- field without vortices
- fields of atom
- file field
- finite field
- first critical field
- first field
- fixed-length field
- flag field
- focusing field
- force-free magnetic field
- forward field
- frame number field
- Fraunhofer field
- free field
- free-space field
- Fresnel field
- fringing field of junction
- fringing field
- frozen field
- gage field
- Galois field pn
- Galois field
- gate-to-drain field
- geometrical optics field
- gradient field
- gravitational field
- green field
- guide field
- guiding field
- H field
- halaxy magnetic field
- Hall electric field
- Hall field
- harmonic field
- head number field
- heating electric field
- heating field
- helical field
- heliotron magnetic field
- high-frequency field
- holographically reconstructed field
- homogeneous field
- hyperfine field
- ID field
- identifier field
- I-field
- illuminating field
- impressed field
- incident field
- inducing field
- induction field
- infinite field
- information field
- inhomogeneous field
- in-plane field
- instruction field
- integer field
- interlaced field
- internal field
- interplanetary magnetic field
- irrotational field
- jack field
- junction field
- Kerr field
- key field
- label field
- lamellar field
- laser field
- lateral field
- leakage field
- local field
- local receptive field
- localized field
- macroscopic field
- magnetic bias field
- magnetic field
- magnetic fields of eye
- magnetic mirror field
- magnetization reversal field
- magnetizing field
- magnetostatic field
- magnetron critical field
- maximum permeability field
- Mersenne field
- message field
- microscopic field
- mirror field
- modulating field
- modulation field
- molecular field
- monochromatic field
- multibeam field
- multidimensional field
- near field
- near-zone field
- noise field
- noncircuital field
- nonstationary field
- nonuniform field
- normal-mode field
- nucleation field
- numeric field
- nutation field
- object field
- odd field
- operand field
- operation field
- orderable field
- ordered field
- particle switching field
- penumbra field
- periodic field
- perpendicular critical field
- perturbed field
- physical optics field
- piezoelectric field
- polarization field
- poloidal field
- potential field
- primary color field
- prime field
- privilege field
- proper field
- protected field
- pseudoscalar field
- pump field
- pumping field
- punched-card field
- quadrupolar field with X neutral point
- quadrupolar field with X-type neutral point
- quadrupolar field
- quantum field
- quasi-potential field
- quotent field
- radial field
- radiated field
- radiation field
- radio influence field
- radio-frequency field
- reactive field
- receptive field
- reconstructed field
- red field
- rediffracted field
- reference field
- reflected field
- repeating field
- reradiated field
- residual field
- residue class field
- resonance field
- retarding field
- RF field
- rotating field
- rotational field
- satellite's field of view
- scalar field
- scattered field
- second critical field
- second field
- sector number field
- seed field
- self-consistent field
- shadow field
- shaping field
- signal field
- skipped field
- solenoidal field
- sort field
- sound field
- source field
- source-to-drain field
- space-charge field
- spinor field
- spontaneous magnetic fields of brain
- starting field
- static field
- stationary field
- stochastic field
- stray field
- superposed field
- surface superconducting field
- sweeping field
- switching field
- symbol field
- tag field
- television field
- tensor field
- thermal field
- thermal radiation field
- third critical field
- threshold field
- topological field
- transient field
- transition field
- trapped field
- traveling field
- tunneling field
- two-turn field
- uniform field
- unit electric field
- unperturbed field
- vanishing field - variant field
- vector field
- visual field
- vortex field
- wall creation field
- wave field
- waveguide field
- write field
- zero-approximation fieldThe New English-Russian Dictionary of Radio-electronics > field
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8 vector
1) вектор
2) векторный
3) <math.> матрица-столбец
4) <aeron.> пеленг
– axial vector
– basis vector
– bound vector
– buckling vector
– Burgers vector
– column vector
– component of a vector
– component vector
– contravariant vector
– control vector
– correction vector
– covariant vector
– current vector
– decomposition of vector
– derivative of vector
– divergence of vector
– electric vector
– four-momentum vector
– free vector
– input vector
– interrupt vector
– irrotational vector
– linear-dependent vector
– localized vector
– magnetic vector
– magnitude of vector
– modulus of vector
– non-localized vector
– non-vanishing vector
– normal vector
– null vector
– pendulum vector
– position vector
– price vector
– radius vector
– reciprocal vector
– resultant vector
– reversed vector
– rotating vector
– row vector
– solenoidal vector
– space vector
– state vector
– tangent vector
– unit vector
– vector admittance
– vector analysis
– vector calculus
– vector component
– vector equation
– vector impedance
– vector notation
– vector polygon
– vector potential
– vector product
– vector quantity
– vector space
– vector sum
– vector train
– velocity vector
absolute value of a vector — <math.> величина вектора, модуль вектора
circuital vector field — <electr.> поле вихревое
electric displacement vector — вектор электрической индукции
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9 implantation
1) имплантация•-
base implantation
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channel implantation
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channel stop implantation
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collector implantation
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double implantation
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double-ion implantation
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drain implantation
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emitter implantation
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field-oxide implantation
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field implantation
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gate implantation
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hot ion implantation
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ion-beam implantation
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ion implantation
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localized implantation
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local implantation
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masked ion implantation
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maskless implantation
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multiple implantation
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n-type ion implantation
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n-type implantation
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p-type ion implantation
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p-type implantation
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self-aligned ion implantation
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shallow implantation
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single-ion implantation
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source implantation -
10 diffusion
1) диффузия; распространение путём диффузии2) диффузное рассеяние; рассеяние в широких пределах3) рассеивание, распространение влияния одного знака или одного элемента ключа на несколько знаков ( в криптографии)•- diffusion of heat
- abnormal diffusion
- adiabatic diffusion
- ambipolar diffusion
- anisotropic diffusion
- anomalous diffusion
- axial diffusion
- base diffusion
- beam diffusion
- binary diffusion
- block cipher data diffusion
- Bohm diffusion
- capacitor diffusion
- carrier diffusion
- closed-tube diffusion
- coherent diffusion
- collector diffusion
- collector-contact diffusion
- collisional diffusion
- complementary diffusion
- complete diffusion
- controlled diffusion
- convective diffusion
- cooperative diffusion
- cross diffusion
- current diffusion
- data diffusion
- deep diffusion
- defect diffusion
- differential diffusion
- doped-oxides diffusion
- double diffusion
- drive-in diffusion
- electrolyte diffusion
- emitter diffusion
- enhanced diffusion
- free-radical diffusion
- gas-phase diffusion
- gas-phase source diffusion
- grain-boundary diffusion
- guarding diffusion
- improper diffusion
- impurity diffusion - initial diffusion
- insulation diffusion
- intervening diffusion
- inward diffusion
- isolation diffusion
- isothermal diffusion
- key diffusion
- lateral diffusion
- liquid-phase diffusion
- liquid-phase source diffusion
- localized diffusion
- masked diffusion
- membrane diffusion
- mesa diffusion
- narrow-angle diffusion
- nonmasked diffusion
- nonuniform diffusion
- n-type diffusion
- omnidirectional diffusion
- one-way diffusion
- open-tube diffusion
- out-diffusion
- outward diffusion
- overall diffusion
- oxide-masked diffusion
- partial diffusion
- particle diffusion
- perfect diffusion
- phase diffusion
- planar-source diffusion
- plasma diffusion
- post-alloy diffusion
- predeposition diffusion
- preferential diffusion
- proton enhanced diffusion
- p-type diffusion
- quadruple diffusion
- quantum diffusion
- radiation enhanced diffusion
- reach-through diffusion
- resistive diffusion
- resistor diffusion
- selective diffusion
- sequential diffusion
- shallow diffusion
- sheet-type diffusion
- simultaneous diffusion
- single diffusion
- solid-phase diffusion
- solid-phase source diffusion
- solid-state diffusion
- spin diffusion
- standard boron base and resistor diffusion
- steady-state diffusion
- stop diffusion
- stream cipher data diffusion
- successive diffusion
- surface diffusion
- technology diffusion
- through diffusion
- transient diffusion
- triple diffusion
- turbulent diffusion
- two-stage diffusion
- two-step diffusion
- two-way diffusion
- uniform diffusion
- vacuum diffusion
- vapor diffusion
- volume diffusion
- wide-angle diffusion -
11 switching
1) переключение; коммутация2) выключение; включение; разъединение; соединение; прерывание•- automatic emulation switching
- automatic mode switching
- automatic network switching
- automatic reperforator switching
- bank switching
- beam switching
- beam-lobe switching
- bubble-domain switching
- bubble state switching
- channel switching
- charge-controlled switching
- circuit switching
- code switching
- code-division switching
- context switching
- critical-field switching
- cut-through switching
- data link switching
- demand-assigned switching
- dial switching
- domain-wall state switching
- dynamic switching
- electrothermal switching
- emulation switching
- energy-controlled switching
- flux state switching
- frequency-division switching
- front-porch switching
- gain switching
- head switching
- integrated voice/data switching
- label switching
- line switching
- lobe switching
- localized switching
- machine switching
- magnetization switching
- memory switching
- message switching
- minor switching
- multiprotocol label switching
- noncentral-circuit switching
- packet switching
- parametric switching
- passive Q-switching
- phase switching
- preprogrammed switching
- progressive switching
- protocol switching
- pulsed Q-switching
- push-button switching
- Q-switching
- sharing switching
- space switching
- space-division switching
- stage-by-stage switching
- step-by-step switching
- store-and-forward switching
- stored-program control-assisted electromechanical switching
- surface switching
- sweep switching
- tandem switching
- task switching
- telecommunications circuit switching
- thermomagnetic switching
- threshold switching
- time-division switching
- trunk switching
- virtual switching -
12 diffusion
1) диффузия; распространение путём диффузии2) диффузное рассеяние; рассеяние в широких пределах3) рассеивание, распространение влияния одного знака или одного элемента ключа на несколько знаков ( в криптографии)•- adiabatic diffusion
- ambipolar diffusion
- anisotropic diffusion
- anomalous diffusion
- axial diffusion
- base diffusion
- beam diffusion
- binary diffusion
- block cipher data diffusion
- Bohm diffusion
- capacitor diffusion
- carrier diffusion
- closed-tube diffusion
- coherent diffusion
- collector diffusion
- collector-contact diffusion
- collisional diffusion
- complementary diffusion
- complete diffusion
- controlled diffusion
- convective diffusion
- cooperative diffusion
- cross diffusion
- current diffusion
- data diffusion
- deep diffusion
- defect diffusion
- differential diffusion
- diffusion of excitation
- diffusion of heat
- doped-oxides diffusion
- double diffusion
- drive-in diffusion
- electrolyte diffusion
- emitter diffusion
- enhanced diffusion
- free-radical diffusion
- gas-phase diffusion
- gas-phase source diffusion
- grain-boundary diffusion
- guarding diffusion
- improper diffusion
- impurity diffusion
- incomplete diffusion - insulation diffusion
- intervening diffusion
- inward diffusion
- isolation diffusion
- isothermal diffusion
- key diffusion
- lateral diffusion
- liquid-phase diffusion
- liquid-phase source diffusion
- localized diffusion
- masked diffusion
- membrane diffusion
- mesa diffusion
- narrow-angle diffusion
- nonmasked diffusion
- nonuniform diffusion
- n-type diffusion
- omnidirectional diffusion
- one-way diffusion
- open-tube diffusion
- out-diffusion
- outward diffusion
- overall diffusion
- oxide-masked diffusion
- partial diffusion
- particle diffusion
- perfect diffusion
- phase diffusion
- planar-source diffusion
- plasma diffusion
- post-alloy diffusion
- predeposition diffusion
- preferential diffusion
- proton enhanced diffusion
- p-type diffusion
- quadruple diffusion
- quantum diffusion
- radiation enhanced diffusion
- reach-through diffusion
- resistive diffusion
- resistor diffusion
- selective diffusion
- sequential diffusion
- shallow diffusion
- sheet-type diffusion
- simultaneous diffusion
- single diffusion
- solid-phase diffusion
- solid-phase source diffusion
- solid-state diffusion
- spin diffusion
- standard boron base and resistor diffusion
- steady-state diffusion
- stop diffusion
- stream cipher data diffusion
- successive diffusion
- surface diffusion
- technology diffusion
- through diffusion
- transient diffusion
- triple diffusion
- turbulent diffusion
- two-stage diffusion
- two-step diffusion
- two-way diffusion
- uniform diffusion
- vacuum diffusion
- vapor diffusion
- volume diffusion
- wide-angle diffusionThe New English-Russian Dictionary of Radio-electronics > diffusion
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13 switching
1) переключение; коммутация2) выключение; включение; разъединение; соединение; прерывание•- automatic mode switching
- automatic network switching
- automatic reperforator switching
- bank switching
- beam switching
- beam-lobe switching
- bubble state switching
- bubble-domain switching
- channel switching
- charge-controlled switching
- circuit switching
- code switching
- code-division switching
- context switching
- critical-field switching
- cut-through switching
- data link switching
- demand-assigned switching
- dial switching
- domain-wall state switching
- dynamic switching
- electrothermal switching
- emulation switching
- energy-controlled switching
- flux state switching
- frequency-division switching
- front-porch switching
- gain switching
- head switching
- integrated voice/data switching
- label switching
- line switching
- lobe switching
- localized switching
- machine switching
- magnetization switching
- memory switching
- message switching
- minor switching
- multiprotocol label switching
- noncentral-circuit switching
- packet switching
- parametric switching
- passive Q switching
- phase switching
- preprogrammed switching
- progressive switching
- protocol switching
- pulsed Q switching
- push-button switching
- Q switching
- sharing switching
- space switching
- space-division switching
- stage-by-stage switching
- step-by-step switching
- store-and-forward switching
- stored-program control-assisted electromechanical switching
- surface switching
- sweep switching
- tandem switching
- task switching
- telecommunications circuit switching
- thermomagnetic switching
- threshold switching
- time-division switching
- trunk switching
- virtual switchingThe New English-Russian Dictionary of Radio-electronics > switching
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14 situation
ситуация, обстановка, положение; состояние; условия— chemical warfare situation— electronic environment situation— ground activities situation— jamming environment situation -
15 target
объект; цель; мишень; задача; задание; норма; заданный показатель [срок]; конечный пункт; пункт назначения; заданное значение; норматив ( боевой подготовки) ; программировать траекторию ( ракеты) ; нацеливать; прицеливать; ставить задачу на удар [стрельбу] по цели; наводить; подготавливать огонь; приводить ( оружие) к нормальному бою, пристреливать; определять разнобой ( орудий) ; засекать ( цель) ;flare drop tow(ed) target — буксируемая мишень, отстреливающая ИК ловушки
pass the target (to) — передавать цель (напр. в другой сектор)
— aerial training target— hardened target— heat contrast target— interdiction-type target— pay off target— personnel-type target— prone silhouette target— scheduled nuclear target— shore-based target— towed target -
16 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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