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1 система координат
система координат
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
co-ordinate system
A reference system used to measure horizontal and vertical distances on a planimetric map. A coordinate system is usually defined by a map projection, a spheroid of reference, a datum, one or more standard parallels, a central meridian, and possible shifts in the x- and y-directions to locate x, y positions of point, line, and area features. A common coordinate system is used to spatially register geographic data for the same area. (Source: ESRI)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > система координат
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2 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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3 European
European [‚jʊərə'pi:ən]1 noun(inhabitant of Europe) Européen(enne) m,f; (pro-Europe) partisan m de l'Europe unie, Européen(enne) m,feuropéen;∎ we must adopt a more European outlook nous devons adopter un point de vue plus européen ou plus ouvert sur l'Europe;∎ the Single European Market le marché unique (européen)►► European Atomic Energy Community Communauté f européenne de l'énergie atomique;the European Bank for Reconstruction and Development la Banque européenne pour la reconstruction et le développement;European Broadcasting Union Union f européenne de radiodiffusion, UER f;the European Central Bank la banque centrale européenne;Finance European Central Securities Depositories Association association f européenne des dépositaires centraux de titres;Politics the European Coal and Steel Community la Communauté européenne de charbon et de l'acier;the European Commission la Commission européenne;European Commissioner commissaire m européen;Politics the European Community la Communauté européenne;the European Convention on Human Rights la Convention européenne des droits de l'homme;American European Common Market Marché m commun européen;the European Court of Justice la Cour européenne de justice;Football European Cup Coupe f d'Europe;Finance European currency snake serpent m monétaire européen;Finance European Development Fund Fonds m européen de développement;Politics European Economic Area Espace m économique européen;formerly European Economic Community Communauté f économique européenne;European Environmental Bureau Bureau m européen de l'environnement;European Free Trade Association Association f européenne de libre-échange;European Investment Bank Banque f européenne d'investissement;Finance European monetary agreement accord m monétaire européen;formerly the European Monetary Cooperation Fund le Fonds européen de coopération monétaire;Finance European Monetary Fund Fonds m monétaire européen;Finance the European Monetary Institute l'Institut m monétaire européen;European Parliament Parlement m européen;American European plan (in hotel) chambre f sans pension;the European Regional Development Fund le fonds européen de développement régional;Finance European Social Fund Fonds m social européen;European Space Agency Agence f spatiale européenne;European Standards Commission comité m européen de normalisation;the European Union l'Union f européenne -
4 экономика окружающей среды
экономика окружающей среды
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
environmental economics
A recognized field of specialization in the discipline of Economics that embraces the issues of pollution control and environment protection, in which costs and benefits are difficult or impossible to estimate, much of the subject matter falling outside the competitive market system. Yet, it is an area in which immense common property resources need to be allocated sensibly to the overall public good. The subject is also very much concerned with ways and means to achieve this sensible allocation such as emission and effluent charges, user charges for the treatment or disposal of waste, environmental taxes, product charges, deposit refunds, tradeable pollution rights, performance bonds, natural resource accounting, and the economic implications of sustainable development. (Source: GILP96)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > экономика окружающей среды
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