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1 multiple-frequency shift keying
English-German dictionary of Electrical Engineering and Electronics > multiple-frequency shift keying
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2 multiple frequency modulation
< edp> (magnetic media recording method) ■ modifizierte Frequenzmodulation f (MFM) DIN ; magnetische Feldmodulation f ; modifizierte Wechseltaktschrift f ; Magnetfeldmodulation fEnglish-german technical dictionary > multiple frequency modulation
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3 Dual Tone Multiple-Frequency
(DTMF) < edp> (audio signaling frequency on touchtone, pushbutton phones) ■ Dual-Tone Multiple-Frequency f (DTMF)English-german technical dictionary > Dual Tone Multiple-Frequency
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4 dual-tone multiple frequency
English-German dictionary of Electrical Engineering and Electronics > dual-tone multiple frequency
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5 frequency-division multiple access
English-German dictionary of Electrical Engineering and Electronics > frequency-division multiple access
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6 Frequency Division Multiple Access
abbr. FDMAУниверсальный русско-немецкий словарь > Frequency Division Multiple Access
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7 Frequency-Hopping Multiple Access
abbr. FHMAУниверсальный русско-немецкий словарь > Frequency-Hopping Multiple Access
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8 frequency-division multiple access
(FDMA) < tele> ■ Frequenzvielfachzugriff m (FDMA); Frequenzmultiplex n ; Vielfachzugriff im Frequenzmultiplex m ; Mehrfachzugriff im Frequenzmultiplex m ; FDMA-Verfahren nEnglish-german technical dictionary > frequency-division multiple access
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9 frequency-division multiple access
n DT, TELECOM Mehrfachzugriff im Frequenzmultiplex mDictionary English-German Informatics > frequency-division multiple access
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10 high-frequency multiple use of subscriber’s lines
high-frequency multiple use of subscriber’s lines NRT hochfrequente Mehrfachausnutzung f von TeilnehmerleitungenEnglish-German dictionary of Electrical Engineering and Electronics > high-frequency multiple use of subscriber’s lines
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11 radio-frequency multiple telephone
radio-frequency multiple telephone Hochfrequenzmehrfachfernsprecher mEnglish-German dictionary of Electrical Engineering and Electronics > radio-frequency multiple telephone
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12 time division-frequency division multiple access
time division-frequency division multiple access (TD-FDMA) KM zeit- und frequenzgeschachtelter Mehrfachzugriff m (Mehrfachzugriffsverfahren beim GSM)English-German dictionary of Electrical Engineering and Electronics > time division-frequency division multiple access
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13 UMTS Terrestrial Radio Access Frequency-Division Duplex
English-german technical dictionary > UMTS Terrestrial Radio Access Frequency-Division Duplex
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14 wideband code-division multiple access WCDMA
English-german technical dictionary > wideband code-division multiple access WCDMA
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15 DTMF
< edp> (audio signaling frequency on touchtone, pushbutton phones) ■ Dual-Tone Multiple-Frequency f (DTMF) -
16 кратно-частотная вибрация
кратно-частотная вибрация
Вибрация с частотой, кратной частоте вращения и не зависящей от неуравновешенности ротора.
Примечание
Такая вибрация может быть вызвана различными причинами, например анизотропией ротора.
[ ГОСТ 19534-74]Тематики
EN
DE
FR
Русско-немецкий словарь нормативно-технической терминологии > кратно-частотная вибрация
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17 Кратно - частотная вибрация
94. Кратно - частотная вибрация
D. Vibration m it Vielfach-Frequenz
E. Multiple-frequency vibration
F. Vibration sur une multiple frequence de la rotation
Вибрация с частотой, кратной частоте вращения и не зависящей от неуравновешенности ротора.
Примечание. Такая вибрация может быть вызвана различными причинами, например анизотропией ротора
Источник: ГОСТ 19534-74: Балансировка вращающихся тел. Термины оригинал документа
Русско-немецкий словарь нормативно-технической терминологии > Кратно - частотная вибрация
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18 DTMF
English-German dictionary of Electrical Engineering and Electronics > DTMF
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19 многоцепная линия электропередачи
многоцепная линия электропередачи
Линия электропередачи, имеющая более двух комплектов фазных или разнополярных электрических проводов.
[ ГОСТ 24291-90]EN
multiple circuit line
a line comprising several circuits not necessarily at the same voltage and frequency installed on the same support
[IEV number 466-01-10]FR
ligne multiple
ligne comprenant plusieurs circuits, éventuellement de tensions et de fréquences différents, installés sur le même support
[IEV number 466-01-10]Тематики
EN
DE
FR
Русско-немецкий словарь нормативно-технической терминологии > многоцепная линия электропередачи
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20 длительный допустимый ток
- Strombelastbarkeit, f
- Dauerstrombelastbarkeit, f
(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-немецкий словарь нормативно-технической терминологии > длительный допустимый ток
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См. также в других словарях:
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Frequency-shift keying — Modulation par déplacement de fréquence Exemple de modulation FSK cohérente La modulation par déplacement de fréquence (MDF), plus connue sous sa dénomination anglophone de frequency shift keying (FSK) est un mode de modulation de fréquence… … Wikipédia en Français
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