-
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
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2 present
cadeau ⇒ 1 (a) présent ⇒ 1 (b), 1 (c), 2 (a) actuel ⇒ 2 (b) donner ⇒ 3 (a), 3 (c) remettre ⇒ 3 (a) présenter ⇒ 3 (b), 3 (c)-(h), 3 (j)∎ to give sb a present faire un cadeau à qn;∎ we gave her a pony as a present nous lui avons offert un ou fait cadeau d'un poney;∎ to make sb a present of sth faire cadeau de qch à qn;∎ it's for a present (in shop) c'est pour offrir∎ at present actuellement, à présent;∎ that's all I can tell you at present c'est tout ce que je peux vous dire pour l'instant ou pour le moment;∎ as things are at present (at this stage) au point où en sont les choses; (nowadays) par les temps qui courent;∎ up to the present jusqu'à présent, jusqu'à maintenant;∎ that's enough for the present ça suffit pour le moment ou pour l'instant;∎ to live only in or for the present vivre pour l'instant présent ou au présent∎ in the present au présent∎ by these presents par les présentes(a) (in attendance) présent;∎ to be present at a meeting être présent à ou assister à une réunion;∎ how many were present? combien de personnes étaient là ou étaient présentes?;∎ those present were very moved les personnes présentes étaient très émues, l'assistance était très émue;∎ he cannot be interviewed without a lawyer being present on ne peut pas l'interroger sans la présence d'un avocat;∎ present company excepted à l'exception des personnes présentes(b) (current → job, government, price) actuel;∎ in the present case dans le cas présent;∎ at the present time actuellement, à l'époque actuelle;∎ up to the present day jusqu'à présent, jusqu'à aujourd'hui;∎ the present year l'année f en cours; Finance l'année f courante;∎ given the present circumstances étant donné les circonstances actuelles, dans l'état actuel des choses;∎ in the present writer's opinion de l'avis de l'auteur de ces lignes∎ to present sth to sb or sb with sth donner ou offrir qch à qn;∎ they presented him with a clock ils lui ont offert une ou fait cadeau d'une pendule;∎ he presented his collection to the museum il a fait cadeau de sa collection au musée;∎ the singer was presented with a bunch of flowers la chanteuse s'est vu offrir ou remettre un bouquet de fleurs;∎ who is going to present the prizes? qui va procéder à la remise des prix?;∎ she was presented with first prize on lui a décerné le premier prix;∎ the project presents us with a formidable challenge le projet constitue pour nous un formidable défi;∎ he presented us with a fait accompli il nous a mis devant le fait accompli;∎ they were presented with an empty goalmouth ils se trouvèrent devant un but vide;∎ this presented her with no option but to agree ceci ne lui a pas laissé d'autre alternative que d'accepter;∎ figurative to present sb with an easy target offrir une bonne cible à qn;∎ she presented him with a daughter elle lui a donné une fille∎ to present sb to sb présenter qn à qn;∎ allow me to present Mr Jones permettez-moi de vous présenter M. Jones;∎ to be presented at Court être présenté à la Cour∎ the programme was presented by Ian King l'émission était présentée par Ian King(e) (offer → entertainment) présenter;∎ we proudly present Donna Stewart nous avons le plaisir ou nous sommes heureux de vous présenter Donna Stewart;∎ presenting Vanessa Brown in the title role avec Vanessa Brown dans le rôle principal;∎ the opera company is presenting a varied programme la troupe de l'opéra présente un programme varié∎ the essay is well presented la dissertation est bien présentée;∎ I wish to present my complaint in person je tiens à déposer plainte moi-même;∎ to present a bill in Parliament présenter ou introduire un projet de loi au Parlement;∎ Law to present a plea introduire une instance∎ the house presented a sorry sight la maison offrait un triste spectacle;∎ if the opportunity presents itself si l'occasion se présente;∎ a strange idea presented itself to her une idée étrange lui est venue;∎ the case presents all the appearances of murder tout semble indiquer qu'il s'agit d'un meurtre;∎ to present sb/sth in a good/bad light présenter qn/qch sous un jour favorable/défavorable(h) (show → passport, ticket) présenter;∎ you must present proof of ownership vous devez présenter un certificat de propriété ou prouver que cela vous appartient;∎ Military present arms! présentez armes!(i) (arrive, go)∎ to present oneself se présenter;∎ she presented herself at 9 o'clock as instructed elle se présenta, comme convenu, à 9 heures;∎ to present oneself at or for an examination se présenter à ou pour un examen∎ to present a cheque for payment présenter un chèque à l'encaissement;∎ to present a bill for acceptance présenter une traite à l'acceptation∎ the foetus presented itself normally la présentation (fœtale) était normale∎ the patient presented with bruises and multiple fractures cette patiente présentait des contusions et des fractures multiples►► Finance present capital capital m appelé;Grammar present indicative présent m de l'indicatif;Grammar present participle participe m présent;Grammar present perfect passé m composé;∎ in the present perfect au passé composé;Grammar present subjunctive présent m du subjonctif;Grammar present tense présent m;∎ in the present tense au présent;Accountancy present value valeur f actuelle ou actualisée -
3 максимальный ожидаемый пиковый ток (цепи переменного тока)
- valeur maximale de crête du courant présumé (d'un circuit à courant alternatif)
максимальный ожидаемый пиковый ток (цепи переменного тока)
Ожидаемый пиковый ток, возникающий в момент, обусловливающий его наибольшее возможное значение.
Примечание. В многофазной цепи многополюсного аппарата максимальный ожидаемый ток характеризует только один полюс
МЭК 60050(441-17-04).
[ ГОСТ Р 50030. 1-2000 ( МЭК 60947-1-99)]
[ ГОСТ Р 50345-99( МЭК 60898-95)]EN
maximum prospective peak current (of an a.c. circuit)
the prospective peak current when initiation of the current takes place at the instant which leads to the highest possible value
NOTE – For a multiple device in a polyphase circuit, the maximum prospective peak current refers to a single pole only.
[IEV number 441-17-04]FR
valeur maximale de crête du courant présumé (d'un circuit à courant alternatif)
valeur de crête du courant présumé quand l'établissement du courant a lieu à l'instant qui conduit à la plus grande valeur possible
NOTE – Pour un appareil multipolaire dans un circuit polyphasé, la valeur maximale de crête du courant présumé ne se rapporte qu'à un seul pôle.
[IEV number 441-17-04]Тематики
- выключатель автоматический
- выключатель, переключатель
- электротехника, основные понятия
EN
- maximum prospective peak current (of an a.c. circuit)
DE
FR
- valeur maximale de crête du courant présumé (d'un circuit à courant alternatif)
Русско-французский словарь нормативно-технической терминологии > максимальный ожидаемый пиковый ток (цепи переменного тока)
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