-
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 контрольная температура окружающего воздуха
контрольная температура окружающего воздуха
Температура окружающего воздуха, при которой устанавливают время-токовые характеристики.
[ ГОСТ Р 50345-99( МЭК 60898-95)]EN
reference ambient air temperature
the ambient air temperature on which the time-current characteristics are based
[IEC 60898-1, ed. 1.0 (2002-01)]FR
température de référence de l'air ambiant
température de l'air ambiant sur laquelle sont basées les caractéristiques de temps-courant
[IEC 60898-1, ed. 1.0 (2002-01)]При отсутствии других указаний:
- для тепловых расцепителей значения срабатывания указывают для контрольной температуры (30±2) °С.
Рабочие характеристики расцепителей, зависящие от температуры окружающего воздуха, следует проверять при контрольной температуре (см. 4.7.3 и 5.2Ь), подавая испытательный ток во все фазные полюса расцепителя
[ ГОСТ Р 50030. 2-99 ( МЭК 60947-2-98)]
Для АВО, калиброванных на контрольную температуру, отличную от (23±2) °С, испытание должно проводиться при этой температуре с допуском ±2 °С.
[ ГОСТ Р 50031-99( МЭК 60934-93)]
Номинальный ток (In)
Установленный изготовителем ток, который выключатель способен проводить в продолжительном режиме (см. 4.3.2.14) при указанной контрольной температуре окружающего воздуха.
Стандартная контрольная температура окружающего воздуха 30 °С. Если для данного выключателя используется другое контрольное значение температуры окружающего воздуха, необходимо учитывать ее влияние на защиту кабелей от перегрузки, так как согласно монтажным правилам она также основывается на контрольной температуре окружающего воздуха.
Примечание — Контрольную температуру для защиты кабелей от перегрузок принимают 25 °С по МЭК 369 [5].
[ ГОСТ Р 50345-99( МЭК 60898-95)]
Параллельные тексты EN-RUThe operating characteristic of the breaker with a thermal magnetic trip element changes as the base ambient temperature is adjusted to 40°C.
[LS Industrial Systems]Значения рабочих характеристик автоматических выключателей с теплоэлектромагнитным расцепителем зависят от температуры окружающего воздуха и отличаются от значений, указанных для контрольной температуры 40 °С.
[Перевод Интент]Rated current compensation in accordance with ambient temperature
When normal ambient temperature exceeds the temperature specified in the environment the following formula help to select the applicable current.
[LS Industrial Systems]Изменение номинального тока в зависимости от температуры окружающего воздуха
Если температура окружающего воздуха будет превышать контрольную температуру, то допустимый рабочий ток можно рассчитать по приведенной ниже формуле.
[Перевод Интент]Тематики
EN
- base ambient temperature
- normal ambient temperature
- reference ambient air temperature
- reference temperature
FR
Русско-французский словарь нормативно-технической терминологии > контрольная температура окружающего воздуха
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3 live
I.live1 [lɪv]• nothing could live in such a hostile environment rien ne pourrait survivre dans un environnement si hostile• you'll live! (inf) tu n'en mourras pas !• let's live a little! (inf) il faut profiter de la vie !• if you haven't been to Rio you haven't lived! (inf) si tu n'as pas vu Rio, tu n'as rien vu !b. ( = earn one's living) gagner sa viec. ( = reside) habiter• where do you live? où habitez-vous ?• where does the teapot live? (inf) où est-ce que vous rangez la théière ?3. compounds[+ disgrace] faire oublier (avec le temps)a. [+ person] vivre aux crochets deb. [+ fruit, rice] se nourrir de ; [+ money, benefit] vivre avec► live on[person] continuer à vivre ; [tradition] survivrea. ( = feed on) se nourrir deb. ( = subsist on) to live on $10,000 a year vivre avec 10 000 dollars par an• what does he live on? de quoi vit-il ?c. ( = depend financially on) vivre aux crochets de( = experience) connaître( = be equal to) être à la hauteur de ; ( = be worthy of) répondre àII.live2 [laɪv]1. adjectivea. ( = not dead) vivantb. ( = not recorded) en direct• "recorded live" « enregistré en public »c. [bullet] réel ; ( = unexploded) non exploséd. (with electric current) that's live! c'est branché !2. adverb3. compounds• he's a (real) live wire (inf) il a un dynamisme fou ► live yoghurt noun yaourt m aux ferments actifs* * *I 1. [lɪv]transitive verb ( conduct) vivre [life]2.to live a normal/peaceful life — vivre normalement/paisiblement
1) ( dwell) [animal] vivre; [person] gen vivre, habiter ( with avec); ( have one's address) habiterto live together — vivre ou habiter ensemble
to live in — vivre dans, habiter [house, apartment]
2) ( lead one's life) vivreto live for — ne vivre que pour [sport, work]
to live through something — vivre [experience]
3) ( remain alive) gen, fig vivre; ( survive) survivreas long as I live... — tant que je vivrai...
I'll live! — hum je n'en mourrai pas!
4) ( subsist) vivreto live on ou off — vivre de [fruit, charity]; vivre sur [wage, capital]
5) ( put up with)to live with — accepter [situation]; supporter [décor]
6) ( experience life) vivreyou haven't lived until you've been to... — tu n'as rien vu tant que tu n'es pas allé à...
•Phrasal Verbs:- live in- live on- live out••II 1. [laɪv]to live it up — (colloq) faire la fête (colloq)
1) ( not dead) [animal] vivant; [birth] d'un enfant viable2) Radio, Television [broadcast] en direct; [performance] sur scène; [theatre] vivant; [album] enregistré sur scène3) ( burning) [coal] ardent4) ( capable of exploding) [ammunition] réel/réelle; ( unexploded) [shell] nonexplosé5) Electricity sous tension2.adverb Radio, Television [appear, broadcast] en direct -
4 загрязненная почва
загрязненная почва
—
[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
contaminated soil
Soil which because of its previous or current use has substances under, on or in it which, depending upon their concentration and/or quantity, may represent a direct potential or indirect hazard to man or to the environment. (Source: GRAHAW)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > загрязненная почва
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