-
1 длительный допустимый ток
- courant permanent admissible, m
- courant admissible, m
(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-французский словарь нормативно-технической терминологии > длительный допустимый ток
-
2 электрооборудование
- matériel électrique, m
- matériel
- équipement
электрооборудование
Совокупность электротехнических изделий и (или) электротехнических устройств, предназначенных для выполнения заданной работы. Электрооборудование в зависимости от объекта установки имеет соответствующее наименование, например, электрооборудование автомобиля и др.
[Макаров Е.Ф. Справочник по электрическим сетям 0,4-35 кВ и 110-1150 кВ]
электрооборудование
Совокупность электротехнических устройств, объединенных общими признаками.
Примечание.
Признаками объединения в зависимости от задачи могут быть: назначение, например, технологическое; условия применения, например, тропическое; принадлежность к объекту, например, станку, цеху.
[ ГОСТ 18311-80]
электрооборудование
Любое оборудование, предназначенное для производства, преобразования, передачи, аккумулирования, распределения или потребления электрической энергии, например машины, трансформаторы, аппараты, измерительные приборы, устройства защиты, кабельная продукция, бытовые электроприборы
(МЭС 826-07-01).
[ ГОСТ Р МЭК 61140-2000]
электрическое оборудование
Оборудование, используемое для производства, преобразования, передачи, распределения или потребления электрической энергии.
Примечание - Примерами электрического оборудования могут быть электрические машины, трансформаторы, коммутационная аппаратура и аппаратура управления, измерительные приборы, защитные устройства, электропроводки, электроприемники
[ ГОСТ Р МЭК 60050-826-2009]
электрооборудование
Оборудование, предназначенное для производства, передачи и изменения характеристик электрической энергии, а также для её преобразования в другой вид энергии.
К электрооборудованию нормативные и правовые документы относят электродвигатели, трансформаторы, коммутационную аппаратуру, аппаратуру управления, защитные устройства, измерительные приборы, кабельные изделия, бытовые электрические приборы и другие электротехнические изделия. Электрооборудование используют для производства электрической энергии, изменения её характеристик (напряжения, частоты, вида электрического тока и др.), передачи, распределения электроэнергии и, в конечном итоге, – для её преобразования в другой вид энергии. Электрооборудование, применяемое в электроустановках зданий, обычно предназначено для преобразования электрической энергии в механическую, тепловую и световую энергию, то есть оно представляет собой электроприёмники.
[ http://www.volt-m.ru/glossary/letter/%DD/view/96/]N
equipment
single apparatus or set of devices or apparatuses, or the set of main devices of an installation, or all devices necessary to perform a specific task
NOTE – Examples of equipment are a power transformer, the equipment of a substation, measuring equipment.
[IEV number 151-11-25]
electric equipment
item used for such purposes as generation, conversion, transmission, distribution or utilization of electric energy, such as electric machines, transformers, switchgear and controlgear, measuring instruments, protective devices, wiring systems, current-using equipment
[IEV number 826-16-01]FR
équipement, m
matériel, m
appareil unique ou ensemble de dispositifs ou appareils, ou ensemble des dispositifs principaux d'une installation, ou ensemble des dispositifs nécessaires à l'accomplissement d'une tâche particulière
NOTE – Des exemples d’équipement ou de matériel sont un transformateur de puissance, l’équipement d’une sous-station, un équipement de mesure.
[IEV number 151-11-25]
matériel électrique, m
matériel utilisé pour la production, la transformation, le transport, la distribution ou l'utilisation de l'énergie électrique, tel que machine, transformateur, appareillage, appareil de mesure, dispositif de protection, canalisation électrique, matériels d'utilisation
[IEV number 151-11-25]Тематики
Синонимы
EN
DE
- Ausrüstung
- Betriebsmittel
- elektrisches Betriebsmittel, n
FR
- matériel
- matériel électrique, m
- équipement
Русско-французский словарь нормативно-технической терминологии > электрооборудование
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