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101 continuous current-carrying capacity
длительная пропускная способность по току
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[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
(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
Англо-русский словарь нормативно-технической терминологии > continuous current-carrying capacity
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102 artesian capacity of a well
Англо-русский словарь нормативно-технической терминологии > artesian capacity of a well
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103 maximum capacity well
- скважина с дебитом, соответствующим максимальной производительности насоса
скважина с дебитом, соответствующим максимальной производительности насоса
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[ http://slovarionline.ru/anglo_russkiy_slovar_neftegazovoy_promyishlennosti/]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > maximum capacity well
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104 storage capacity of a well
English-Russian dictionary on nuclear energy > storage capacity of a well
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105 artesian capacity of a well
артезианская производительность скважины (количество воды, которое выдает скважина на поверхность в результате артезианского напора)Англо-русский словарь нефтегазовой промышленности > artesian capacity of a well
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106 maximum capacity well
скважина с дебитом, соответствующим максимальной производительности насосаАнгло-русский словарь нефтегазовой промышленности > maximum capacity well
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107 water-intake capacity of a well
поглощающая способность скважины, приёмистость скважины* * *Англо-русский словарь нефтегазовой промышленности > water-intake capacity of a well
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108 artesian capacity of a well
Нефть и газ: артезианская производительность скважиныУниверсальный англо-русский словарь > artesian capacity of a well
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109 full well capacity
Электроника: ёмкость максимального заполнения потенциальной ямы, полная ёмкость ( пиксела), фотоэлектронная ёмкость (глубина колодца) -
110 maximum capacity well
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111 maximum-capacity well
2) Нефтегазовая техника скважина с дебитом, соответствующим максимальной производительности насоса -
112 productive capacity of a well
Нефть: производительность скважиныУниверсальный англо-русский словарь > productive capacity of a well
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113 specific capacity of a well
Универсальный англо-русский словарь > specific capacity of a well
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114 tested well capacity
Нефтегазовая техника установленная производительность скважины -
115 water-intake capacity of a well
Универсальный англо-русский словарь > water-intake capacity of a well
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116 artesian well capacity
Англо-русский гидрогеологический словарь > artesian well capacity
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117 total capacity of a well
общая или полная производительность скважины.English-Russian dictionary of terms for geological exploration drilling > total capacity of a well
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118 water-intake capacity of a well
поглощающая способность скважины, приемистость скважины.English-Russian dictionary of terms for geological exploration drilling > water-intake capacity of a well
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119 maximum-capacity well
• скважина с дебитом, соответствующим максимальной производительности насосаАнгло-русский словарь нефтегазовой промышленности > maximum-capacity well
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120 productive capacity of a well
Англо-русский словарь нефтегазовой промышленности > productive capacity of a well
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