-
1 коэффициент потерь
- facteur de dissipation, m
коэффициент потерь
коэффициент рассеяния
-
[IEV number 151-15-47]EN
dissipation factor
loss factor
for a capacitor or inductor under periodic conditions, reciprocal of the quality factor
[IEV number 151-15-47]FR
facteur de dissipation, m
pour un condensateur ou une bobine d'inductance en régime périodique, inverse du facteur de qualité
[IEV number 151-15-47]Синонимы
EN
DE
FR
- facteur de dissipation, m
Русско-французский словарь нормативно-технической терминологии > коэффициент потерь
-
2 тангенс угла потерь конденсатора
тангенс угла потерь конденсатора
Отношение активной мощности конденсатора к его реактивной мощности при синусоидальном напряжении определенной частоты
[ ГОСТ 21415-75]
тангенс угла потерь конденсатора
Отношение мощности потерь конденсатора к его реактивной мощности.
[ ГОСТ 1282-88]Тематики
- конденсаторы для повыш. коэф. мощности
- конденсаторы для электронной аппаратуры
EN
DE
FR
56. Тангенс угла потерь конденсатора
D. Verlustfaktor
E. Dissipation factor
F. Tangente de l'angle de pertes
Отношение активной мощности конденсатора к его реактивной мощности при синусоидальном напряжении определенной частоты
Источник: ГОСТ 21415-75: Конденсаторы. Термины и определения оригинал документа
Русско-французский словарь нормативно-технической терминологии > тангенс угла потерь конденсатора
-
3 угол потерь
- angle de pertes, m
угол потерь
-
[IEV number 151-15-48]EN
loss angle
for a capacitor or inductor under periodic conditions, angle the tangent of which is the dissipation factor
NOTE – For dielectric and magnetic materials, other definitions for the loss angle exist.
Source: see IEC 60050-121
[IEV number 151-15-48]FR
angle de pertes, m
pour un condensateur ou une bobine d'inductance en régime périodique, angle dont la tangente est égal au facteur de dissipation
NOTE – Pour les matériaux diélectriques et magnétiques, il existe d'autres définitions de l'angle de pertes.
Source: voir la CEI 60050-121
[IEV number 151-15-48]EN
DE
FR
- angle de pertes, m
Русско-французский словарь нормативно-технической терминологии > угол потерь
-
4 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
-
5 Средняя рассеиваемая мощность коллектора
65. Средняя рассеиваемая мощность коллектора
D. Mittlere Kollektorverlustleistung
E. Collector (average) power dissipation
F. Ruissance dissipée (moyenne) au collecteur
65б. Коэффициент комбинационных составляющих третьего порядка биполярного транзистора
Е Third order intermodulation products factor
Источник: ГОСТ 20003-74: Транзисторы биполярные. Термины, определения и буквенные обозначения параметров оригинал документа
Русско-французский словарь нормативно-технической терминологии > Средняя рассеиваемая мощность коллектора
См. также в других словарях:
Dissipation factor — In physics, the dissipation factor (DF) is a measure of loss rate of energy of a mode of oscillation (mechanical, electrical, or electromechanical) in a dissipative system. It is the reciprocal of Quality factor, which represents the quality of… … Wikipedia
dissipation factor — sklaidos faktorius statusas T sritis fizika atitikmenys: angl. dissipance; dissipation factor; scattering factor vok. Dissipationsgrad, m; Schalldissipationsgrad, m; Streuungskoeffizient, m rus. коэффициент рассеяния, m; множитель рассеяния, m;… … Fizikos terminų žodynas
dissipation factor — sklaidos faktorius statusas T sritis Standartizacija ir metrologija apibrėžtis Išsklaidytos ir krintančios garso galių dalmuo. atitikmenys: angl. dissipance; dissipation factor vok. Dissipationsgrad, m; Schalldissipationsgrad, m rus. коэффициент… … Penkiakalbis aiškinamasis metrologijos terminų žodynas
facteur de dissipation — sklaidos faktorius statusas T sritis fizika atitikmenys: angl. dissipance; dissipation factor; scattering factor vok. Dissipationsgrad, m; Schalldissipationsgrad, m; Streuungskoeffizient, m rus. коэффициент рассеяния, m; множитель рассеяния, m;… … Fizikos terminų žodynas
scattering factor — sklaidos faktorius statusas T sritis fizika atitikmenys: angl. dissipance; dissipation factor; scattering factor vok. Dissipationsgrad, m; Schalldissipationsgrad, m; Streuungskoeffizient, m rus. коэффициент рассеяния, m; множитель рассеяния, m;… … Fizikos terminų žodynas
facteur de dissipation — sklaidos faktorius statusas T sritis Standartizacija ir metrologija apibrėžtis Išsklaidytos ir krintančios garso galių dalmuo. atitikmenys: angl. dissipance; dissipation factor vok. Dissipationsgrad, m; Schalldissipationsgrad, m rus. коэффициент… … Penkiakalbis aiškinamasis metrologijos terminų žodynas
Fluctuation dissipation theorem — In statistical physics, the fluctuation dissipation theorem is a powerful tool for predicting the non equilibrium behavior of a system such as the irreversible dissipation of energy into heat from its reversible fluctuations in thermal… … Wikipedia
Q factor — For other uses of the terms Q and Q factor see Q value. In physics and engineering the quality factor or Q factor is a dimensionless parameter that compares the time constant for decay of an oscillating physical system s amplitude to its… … Wikipedia
Q factor — /ˈkju fæktə/ (say kyooh faktuh) noun 1. a measure of the ratio between stored energy and energy dissipation of an electrical device, etc., used as a measure of efficiency. 2. Also, Q value. the amount of heat released in a nuclear explosion,… …
Ceramic capacitor — In electronics, a ceramic capacitor is a capacitor constructed of alternating layers of metal and ceramic, with the ceramic material acting as the dielectric. The temperature coefficient depends on whether the dielectric is Class 1 or Class 2. A… … Wikipedia
коэффициент потерь — коэффициент рассеяния [IEV number 151 15 47] EN dissipation factor loss factor for a capacitor or inductor under periodic conditions, reciprocal of the quality factor [IEV number 151 15 47] FR facteur de dissipation, m pour un condensateur ou une … Справочник технического переводчика