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1 максимально допустимая величина
Sakhalin energy glossary: maximum allowed valueУниверсальный русско-английский словарь > максимально допустимая величина
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2 максимальное значение
1. maximum value2. эл. peak valueРусско-английский большой базовый словарь > максимальное значение
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3 значение
( расчетного параметра) level, ( величины) magnitude, sense* * *значе́ние с.1. ( размер величины) value, magnitudeвычисля́ть значе́ние — compute [calculate] a valueзадава́ть значе́ние — pre-assign [preset, prescribe, predetermine, specify] a valueнормирова́ть значе́ние — normalize a valueожида́ть значе́ние — expect a valueопределя́ть [оце́нивать] значе́ние — estimate a valueпринима́ть значе́ние1. (в расчётах, проектах) adopt [specify] a value2. (о какой-л. величине) take (on) [assume] a valueуточня́ть значе́ние — ( определять окончательное значение) finalize a value; ( проверять) verify a value2. ( важность) significance3. (смысл, содержание) meaning, senseабсолю́тное значе́ние — absolute value, magnitudeамплиту́дное значе́ние — peak [crest] valueасимптоти́ческое значе́ние — asymptotic valueбифуркацио́нное значе́ние — bifurcational valueвиртуа́льное значе́ние — virtual valueгла́вное значе́ние — principal valueграни́чное значе́ние — boundary valueдвоя́кое значе́ние — bifurcational valueдействи́тельное значе́ние — actual [real] valueде́йствующее значе́ние — effective [root-mean-square, rms] valueдопусти́мое значе́ние — legitimate [admissible, allowed, allowable] valueеди́нственное значе́ние — unique valueзапрещё́нное значе́ние — forbidden [unpermitted] valueи́стинное значе́ние — стат., мат. ideal value; ( в логике) truth valueзначе́ние и́стинности — truth valueконе́чное значе́ние — finite valueмаксима́льное значе́ние1. maximum value2. эл. peak valueмгнове́нное значе́ние — instantaneous valueнача́льное значе́ние — initial valueненулево́е значе́ние — non-zero valueнулево́е значе́ние — zero valueоконча́тельное значе́ние — final valueпредвари́тельное значе́ние — tentative valueпреде́льное значе́ние — limiting valueпроизво́льное значе́ние — arbitrary valueравнове́сное значе́ние — equilibrium valueразрешё́нное значе́ние — allowed [permitted] valueразря́дное значе́ние — place valueсо́бственное значе́ние — characteristic [proper] value, eigenvalue; ( матрицы) latent rootсредневзве́шенное значе́ние — weighted mean valueсре́днее значе́ние — mean, mean [average] valueсре́днее значе́ние по всем состоя́ниям — value averaged over all statesсре́днее арифмети́ческое значе́ние — arithmetical average, arithmetical meanсре́днее геометри́ческое значе́ние — geometrical meanсреднеквадрати́чное значе́ние — root-mean-square [effective, rms] valueстациона́рное значе́ние — steady-state [stationary] valueустанови́вшееся значе́ние — steady-state [stationary] valueуточнё́нное значе́ние ( в методе последовательных приближений) — improved valueхаракте́рное значе́ние — representative valueцелочи́сленное значе́ние — integral valueча́стное значе́ние — particular [special] valueчи́сленное значе́ние — numerical valueнаходи́ть чи́сленное значе́ние алгебраи́ческого выраже́ния — evaluate an (algebraic) expressionзначе́ние шкалы́, коне́чное — full scare valueэффекти́вное значе́ние — effective [root-mean-square, rms] value -
4 длительный допустимый ток
(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-английский словарь нормативно-технической терминологии > длительный допустимый ток
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5 давать возможность
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•This relation provides (or presents) a way (or a possibility, or a means) of estimating the actual savings.
•This method enables one (or us) to solve the Hitchcock problem. The testing machine makes possible testing (or makes it possible to test) large components.
•Knowledge of the numerical values of and offers (or furnishes) a means (or a way) of determining...
•These curves permit the life of bearings to be accurately specified.
•A sharp peak due to stretching of the aldehydic C-H serves to differentiate it from other types of carbonyl compound.
•Alpha emission provides a way for an unstable nucleus to lose two protons and two neutrons simultaneously.
•These criteria provide the means of classifying (or furnish an opportunity to classify) the coal by rank.
* * *Давать возможность -- to give the ability (+ inf.), to allow for, to allow the opportunity of, to provide an (the) opportunity (+ inf.), to provide a means of, to offer the potential of, to offer the potential for, to enableThe process gives the ability to remove soluble or suspended iron to the maximum extent possible.Additionally, some relatively purposeful analysis of the numerical experiments allowed for computational simplifications of the results.Testing in this hierarchical pattern allowed the opportunity of rapidly evaluating the maximum number of concepts requiring minimal time and cost.The discusser's comments provide an opportunity to call attention to a point of much value to the original paper.Transpiration cooled liner approaches offer the potential of substantial reductions in liner cooling flow requirements.The parameter approach offers the potential for extrapolating data without extensive long time testing.The use of a numerical technique has enabled a more general solution of the equations than was previously possible.Русско-английский научно-технический словарь переводчика > давать возможность
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