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1 przeciążalność obwodu prądowego
• overcurrent factorSłownik polsko-angielski dla inżynierów > przeciążalność obwodu prądowego
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2 кратность насыщения
Русско-английский политехнический словарь > кратность насыщения
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3 ylivirtasuhde
• overcurrent ratio• overcurrent factor -
4 коэффициент перегрузки
1) Aviation: acceleration factor, g-load factor2) Engineering: overcurrent factor, overload factor, partial safety factor for load3) Telecommunications: overload coefficient4) Astronautics: g-factor, load factor5) Transport: transshipment factor6) Oil&Gas technology overloading ratio7) Electrical engineering: (допустимой длительной для электрообрудования) service factorУниверсальный русско-английский словарь > коэффициент перегрузки
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5 кратность насыщения
Engineering: overcurrent factorУниверсальный русско-английский словарь > кратность насыщения
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6 Bemessungsüberstromziffer
Deutsch-Englisch Wörterbuch der Elektrotechnik und Elektronik > Bemessungsüberstromziffer
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7 Überstromfaktor
Überstromfaktor m overcurrent factorDeutsch-Englisch Wörterbuch der Elektrotechnik und Elektronik > Überstromfaktor
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8 перегрузка
1) General subject: overburden, overfreight, overpressure, rehandling, overcharge, overwork, surcharge, transshipment, over load2) Geology: out-of-balance load4) Naval: supercharge, supercharging5) Medicine: blockade, overexertion, overstrain6) Military: ( over) load factor, blue-out, (с одного вида транспорта на другой) transshipment7) Engineering: acceleration (в полете от ускорения), blocking, congestion (напр. линии связи), flooding, impaction, load rejection, ol, over load factor, overcharging, overdrive, overload, overshoot (усилителя выходным сигналом), overtaxing (линий, пунктов подачи электроэнергии), overtolerance load, spillover, surcharge load, thrashing (системы управления виртуальной памяти), transfer, transloading, transshipment (с одного вида транспорта на другой)8) Chemistry: overstraining9) Construction: abnormal loading, overburden pressure, overloading, stalling load, supercharge loading, surcharge loading10) Mathematics: transferring11) Railway term: transfer work (напр. на автотранспорт), transhipping12) Law: trans-shipment13) Economy: overloading (транспортного средства), overuse (производственных мощностей), reshipment, strain, transhipment14) Accounting: shifting15) Automobile industry: excess weight, extra duty, freight handling, handling, overweight, rebooking, reloading16) Mining: over-load, overfeeding, transloading (материалов), transshipment (для транспортировки)17) Forestry: transfering (напр. лесоматериалов с автомобиля на железнодорожную платформу)18) Metallurgy: overstress19) Polygraphy: surcharges21) Textile: load-up22) Information technology: congestion (каналов связи), overrun (области, массива), overrunning, starvation23) Oil: excess load, thrasing24) Astronautics: G-load, acceleration force, acceleration in gravity, acceleration in gravity units, acceleration load, g-factor, g-force, g-loading, gravity load, load factor, overflux, rap25) Coolers: overloading (напр. компрессора)26) Ecology: overburdening27) Advertising: overworked capacity28) Household appliances: traffic overflow, traffic overload29) Drilling: straining30) Oilfield: overload overcharging31) Programming: overloading (Использование одного и того же имени для функций с разной сигнатурой (набором параметров). В некоторых текстах используется словосочетание "совместное использование")32) Automation: over-tolerance load, override, overstressing, pick-and-place, reload33) Quality control: overriding (измерительного прибора), straining (машины), supercharge load34) General subject: overcurrent (бортовой электросети)35) Aviation medicine: G-effect, acceleration factor, back acceleration, forward acceleration, head acceleration, left acceleration, load, overload (ing), overload phenomenon, right acceleration, tailward acceleration36) Makarov: blocking (на дороге), congestion (на дороге), excessive load, g-load (летательного аппарата), g-loading (летательного аппарата), load factor (летательного аппарата), overload (превышение нормальный нагрузки), overload (реки обломочным материалом), overshoot (усилителя входным сигналом), spillover (сети), surcharge (напр. трубопровода), surcharge (напр., трубопровода), transshipment (с одного судна на другое)37) Security: congestion (канала связи)38) Logistics: cargo transfer, reshipping, transferring cargo39) Aluminium industry: transfer point41) Electrical engineering: reload (топлива в ядерном реакторе)42) Cement: over-capacity43) Organized crime: trans-shipment of firearms (огнестрельного оружия) -
9 длительный допустимый ток
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Русско-английский словарь нормативно-технической терминологии > длительный допустимый ток
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