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1 характеристика нагрузки
характеристика нагрузки
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[IEV number 312-06-04]EN
load characteristic
linear or non-linear relationship between the value of the output voltage and the value of the output current for a specified load and for a fixed setting of the controls
NOTE 1 – The load can be complex and/or non-linear.
NOTE 2 – The load characteristic can also describe the effects of overload.
[IEV number 312-06-04]FR
caractéristique de charge
relation linéaire ou non linéaire entre la valeur de la tension de sortie et la valeur du courant de sortie pour une charge spécifiée et pour une position fixe des réglages
NOTE 1 – La charge peut être complexe et/ou non linéaire.
NOTE 2 – La caractéristique de charge peut aussi décrire les effets d’une surcharge.
[IEV number 312-06-04]EN
DE
FR
Русско-немецкий словарь нормативно-технической терминологии > характеристика нагрузки
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2 длительный допустимый ток
- Strombelastbarkeit, f
- Dauerstrombelastbarkeit, f
(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-немецкий словарь нормативно-технической терминологии > длительный допустимый ток
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3 номинальное сопротивление входной цепи электрического реле
- Nennimpedanz eines Eingangskreises
- Nennimpedans eines Eingangskreises
- Bemessungsimpedanz eines Erregungskreises
номинальное сопротивление входной цепи электрического реле
Значение полного сопротивления входной цепи электрического реле, определенное в заданных условиях
[ ГОСТ 16022-83]EN
rated impedance of an energizing circuit
the value of the complex impedance of a given energizing circuit of a relay determined under specified conditions
[IEV number 446-12-14]FR
impédance assignée d'un circuit d'alimentation
valeur de l'impédance complexe du circuit d'alimentation considéré, déterminée dans des conditions spécifiées
[IEV number 446-12-14]Тематики
Классификация
>>>EN
DE
FR
62. Номинальное сопротивление входной цепи электрического реле
D. Nennimpedanz eines Eingangskreises
E. Rated impedance of an energizing circuit
F. Impedance assignée d’un circuit d’alimentation
Значение полного сопротивления входной цепи электрического реле, определенное в заданных условиях
Источник: ГОСТ 16022-83: Реле электрические. Термины и определения оригинал документа
Русско-немецкий словарь нормативно-технической терминологии > номинальное сопротивление входной цепи электрического реле
См. также в других словарях:
Complex number — Complex Com plex (k[o^]m pl[e^]ks), a. [L. complexus, p. p. of complecti to entwine around, comprise; com + plectere to twist, akin to plicare to fold. See {Plait}, n.] 1. Composed of two or more parts; composite; not simple; as, a complex being; … The Collaborative International Dictionary of English
complex number — n. any number expressed as a + bi, where a and b are real numbers and i is the imaginary unit, √P1: if b is zero it is a real number, but if b is not zero it is an imaginary number … English World dictionary
complex number — ► NOUN Mathematics ▪ a number containing both a real and an imaginary part … English terms dictionary
Complex number — A complex number can be visually represented as a pair of numbers forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the square root of –1. A complex… … Wikipedia
complex number — noun (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of 1 (Freq. 3) • Syn: ↑complex quantity, ↑imaginary number, ↑imaginary • Topics: ↑mathematics, ↑math, ↑ … Useful english dictionary
complex number — a mathematical expression (a + bi) in which a and b are real numbers and i2 = 1. [1825 35] * * * Any number consisting of both real numbers and imaginary numbers. It has the form a + bi, where a and b are real numbers and i = 1; a is called the… … Universalium
complex number — kompleksinis skaičius statusas T sritis informatika apibrėžtis Skaičius, išreiškiamas tokia forma: a + bi, kur a ir b yra realieji skaičiai, o i yra šaknis iš 1 ir vadinama menamąja dalimi. Kompleksiniai skaičiai gali būti pavaizduojami taškais… … Enciklopedinis kompiuterijos žodynas
complex number — number which is a combination of real and imaginary numbers, non concrete numbers (Mathematics) … English contemporary dictionary
complex number — noun Date: 1856 a number of the form a + b √ 1 where a and b are real numbers … New Collegiate Dictionary
complex number — noun A number of the form a + bi, where a and b are real numbers and i = minus;1 … Wiktionary
complex number — See number … Philosophy dictionary
