-
1 off-state power dissipation
рассеиваемая мощность в закрытом состоянии тиристора
Значение мощности, рассеиваемой тиристором при протекании тока в закрытом состоянии тиристора.
Обозначение
Pзс
PD
[ ГОСТ 20332-84]Тематики
EN
FR
- puissance dissipée à l’état bloqué
Англо-русский словарь нормативно-технической терминологии > off-state power dissipation
-
2 on-state power dissipation
рассеиваемая мощность в открытом состоянии тиристора
Значение мощности, рассеиваемой тиристором при протекании тока в открытом состоянии.
Обозначение
Pос
PT
[ ГОСТ 20332-84]Тематики
EN
FR
- puissance dissipée à l’état passant
Англо-русский словарь нормативно-технической терминологии > on-state power dissipation
-
3 off-state power dissipation
Универсальный англо-русский словарь > off-state power dissipation
-
4 on-state power dissipation
Универсальный англо-русский словарь > on-state power dissipation
-
5 off-state power dissipation
рассеиваемая мощность в закрытом состоянии, рассеиваемая мощность в закрытом состоянии тиристораEnglish-Russian dictionary of mechanical engineering and automation > off-state power dissipation
-
6 on-state power dissipation
рассеиваемая мощность в открытом состоянии, рассеиваемая мощность в открытом состоянии тиристораEnglish-Russian dictionary of mechanical engineering and automation > on-state power dissipation
-
7 off-state power dissipation
рассеиваемая мощность в закрытом состоянии; рассеиваемая мощность в закрытом состоянии тиристораАнгло-русский словарь по машиностроению > off-state power dissipation
-
8 Mean on-state power dissipation
94. Средняя рассеиваемая мощность в открытом состоянии тиристора
E. Mean on-state power dissipation
F. Puissance dissipée moyenne à l’état passant
Pос,ср
Произведение мгновенных значений тока и напряжения в открытом состоянии тиристора, усредненное по всему периоду
Источник: ГОСТ 20332-84: Тиристоры. Термины, определения и буквенные обозначения параметров оригинал документа
Англо-русский словарь нормативно-технической терминологии > Mean on-state power dissipation
-
9 dissipation
1) рассеяние, диссипация3) распыление; разбрасывание•- gate power dissipation
- off-state power dissipation
- on-state power dissipation
- peak gate power dissipation
- peak power dissipation
- power dissipation
- reverse conducting power dissipation
- reverse gate power dissipation
- reverse power dissipation
- surge power dissipation
- surge reverse power dissipation
- turn-off power dissipation
- turn-on power dissipationEnglish-Russian dictionary of mechanical engineering and automation > dissipation
-
10 dissipation
утеря; потеря; утечка; рассеяние; распыление; диссипация; рассеиваемая мощность; разбрасывание- dissipation loss - dissipation mechanism - dissipation of energy - dissipation of heat - dissipation of noise - energy dissipation - forward gate power dissipation - gate power dissipation - heat dissipation - off-state power dissipation - peak gate power dissipation - peak power dissipation - power dissipation -
11 puissance dissipée à l’état bloqué
рассеиваемая мощность в закрытом состоянии тиристора
Значение мощности, рассеиваемой тиристором при протекании тока в закрытом состоянии тиристора.
Обозначение
Pзс
PD
[ ГОСТ 20332-84]Тематики
EN
FR
- puissance dissipée à l’état bloqué
91. Рассеиваемая мощность в закрытом состоянии тиристора
Е. Off-state power dissipation
F. Puissance dissipée à l’état bloqué
Pзс
Значение мощности, рассеиваемой тиристором при протекании тока в закрытом состоянии тиристора
Источник: ГОСТ 20332-84: Тиристоры. Термины, определения и буквенные обозначения параметров оригинал документа
Франко-русский словарь нормативно-технической терминологии > puissance dissipée à l’état bloqué
-
12 puissance dissipée à l’état passant
рассеиваемая мощность в открытом состоянии тиристора
Значение мощности, рассеиваемой тиристором при протекании тока в открытом состоянии.
Обозначение
Pос
PT
[ ГОСТ 20332-84]Тематики
EN
FR
- puissance dissipée à l’état passant
93. Рассеиваемая мощность в открытом состоянии тиристора
Е. On-state power dissipation
F. Puissance dissipée à l’état passant
Pос
Значение мощности, рассеиваемой тиристором при протекании тока в открытом состоянии
Источник: ГОСТ 20332-84: Тиристоры. Термины, определения и буквенные обозначения параметров оригинал документа
Франко-русский словарь нормативно-технической терминологии > puissance dissipée à l’état passant
-
13 Puissance dissipée moyenne à l’état bloqué
92. Средняя рассеиваемая мощность в закрытом состоянии тиристора
Е. Mean off-state power dissipation
F. Puissance dissipée moyenne à l’état bloqué
Pзс,ср
Произведение мгновенных значений тока и напряжения в закрытом состоянии тиристора, усредненное по всему периоду
Источник: ГОСТ 20332-84: Тиристоры. Термины, определения и буквенные обозначения параметров оригинал документа
Франко-русский словарь нормативно-технической терминологии > Puissance dissipée moyenne à l’état bloqué
-
14 Puissance dissipée moyenne à l’état passant
94. Средняя рассеиваемая мощность в открытом состоянии тиристора
E. Mean on-state power dissipation
F. Puissance dissipée moyenne à l’état passant
Pос,ср
Произведение мгновенных значений тока и напряжения в открытом состоянии тиристора, усредненное по всему периоду
Источник: ГОСТ 20332-84: Тиристоры. Термины, определения и буквенные обозначения параметров оригинал документа
Франко-русский словарь нормативно-технической терминологии > Puissance dissipée moyenne à l’état passant
-
15 loss
1) потеря; (мн. ч.) потери3) затухание, ослабление4) срыв ( в следящих системах)5) вчт. проигрыш6) ущерб; убыток•losses by slagging — потери со шлаком;losses by splashing — потери со всплесками;loss on ignition — потери при прокаливании;loss of auxiliary power — потеря вспомогательных источников энергоснабженияloss of circulation — поглощение бурового раствораloss of load — отключение нагрузки; сброс нагрузкиloss of lock rate — нарушение синхронизма, выпадение из синхронизмаloss of phase — 1. отключение (обрыв) фазы 2. выпадение из синхронизма, нарушение синхронизмаloss of synchronism — нарушение синхронизма, выпадение из синхронизма-
absorption loss
-
accumulated loss
-
activation loss
-
active return loss
-
added loss
-
additional iron loss
-
aircraft control loss
-
airscrew slip loss
-
alternating hysteresis loss
-
altitude loss
-
antenna-to-medium coupling loss
-
aperture loss
-
apparent power loss
-
arc-drop loss
-
ashpit loss
-
atmospheric evaporation loss
-
attenuation loss
-
attrition loss
-
avoidable loss
-
backwash loss
-
baking loss
-
balance return loss
-
banking loss
-
bearing friction loss
-
bending loss
-
bit loss
-
bleeding loss of greases
-
boil-off losses
-
branching loss
-
breathing loss
-
bridging loss
-
brush contact resistance loss
-
brush friction loss
-
bulk resistive loss
-
burn-off loss
-
cable loss
-
canal loss
-
capacitor loss
-
capacity loss
-
carbon loss
-
carpet loss
-
choke loss
-
circulating current loss
-
circulating loss
-
cladding loss
-
clad loss
-
coil loss
-
cold loss
-
commutator loss
-
component loss
-
compression loss
-
conduction loss
-
connection loss
-
constant loss
-
contact loss
-
convection loss
-
convective loss
-
conversion loss
-
conveyance loss
-
cooling loss
-
copper loss
-
core loss
-
corona power loss
-
corrosion loss
-
counting loss
-
coupling loss
-
current loss
-
diameter loss
-
dielectric absorption loss
-
dielectric loss
-
dielectric hysteresis loss
-
directional control loss
-
discharge loss
-
dispersion loss
-
dissipation loss
-
dissipative loss
-
distillation loss
-
distribution loss
-
divergence loss
-
dot loss
-
draft loss
-
dust loss
-
dusting loss
-
early loss
-
echo return loss
-
eddy-current loss
-
edge loss
-
elastic loss
-
electric loss
-
end loss
-
entrance loss
-
equivalent power loss
-
evaporation loss
-
evaporative loss
-
excitation loss
-
exit loss
-
external beat loss
-
fiber loss
-
field I2R loss
-
filling loss
-
filter loss
-
fixed loss
-
flow loss
-
form loss
-
free-space loss
-
Fresnel loss
-
friction loss
-
fuel tank loss
-
gap loss
-
generation losses
-
gyromagnetic resonance loss
-
harmonic tooth-ripple loss
-
head loss
-
head-to-tape spacing loss
-
heat loss
-
heat-leak loss
-
hysteresis loss
-
I2R loss
-
idling loss
-
implementation loss
-
incremental hysteresis loss
-
incremental losses
-
individual process loss
-
induction loss
-
in-process loss
-
insertion loss
-
instrument wall loss
-
insulation loss
-
interaction loss
-
intermodulation loss
-
interstage loss
-
intrinsic loss
-
inverse loss
-
ionization loss
-
iron loss
-
irrigation loss
-
jacket loss
-
Joule's loss
-
kerf loss
-
keying loss
-
late loss
-
latent heat loss
-
leakage loss
-
light leakage loss
-
line loss
-
linewidth loss
-
link loss
-
load loss
-
magnetic hysteresis loss
-
magnetic iron loss
-
magnetic loss
-
mass loss
-
mechanical loss
-
melting loss
-
metal loss
-
milling loss
-
mining loss
-
mismatch loss
-
mode conversion loss
-
multipath loss
-
net loss
-
no-load loss
-
ohmic loss
-
oil stock loss
-
on-state power loss
-
open circuit loss
-
operational loss
-
optical loss
-
oven loss
-
overall loss
-
oxidational loss
-
partial mud loss
-
path loss
-
permeation loss of gasoline
-
piezoelectric loss
-
pipe bend loss
-
pipe loss
-
plasma loss
-
pointing loss
-
power loss
-
preparation loss
-
pressure loss
-
pressure rapid loss
-
process loss
-
propagation loss
-
pumping loss
-
radiant loss
-
radiation loss
-
reactive power loss
-
real loss
-
refining loss
-
reflection loss
-
refraction loss
-
refrigeration loss
-
regularity return loss
-
reject loss
-
relaxation loss
-
residual loss
-
resistance loss
-
resonance loss
-
restriction loss
-
return loss
-
rheostatic loss
-
roasting loss
-
rotational loss
-
rusting loss
-
salting loss
-
scattering loss
-
secondary loss
-
self-demagnetization loss
-
shadow loss
-
sheath loss
-
short-circuit loss
-
shrinkage loss
-
shutdown loss
-
signing return loss
-
slip loss
-
specific loss
-
spillover loss
-
splicing loss
-
spreading loss
-
stack loss
-
standby loss
-
standing evaporation loss
-
startup thermal loss
-
steady-state loss
-
storage loss
-
strand loss
-
stray-field loss
-
stray-load loss
-
supplementary loss
-
tailing loss
-
targeting loss
-
temperature loss
-
thickness loss
-
torque retention loss
-
total loss
-
tracking loss
-
transformer loss
-
transition loss
-
transmission line loss
-
transmission loss
-
treatment loss
-
tropospheric loss
-
turn-off power loss
-
vaporization loss
-
variable loss
-
volatilization loss
-
voltage loss
-
volt-ampere loss
-
volumetric loss
-
wall loss
-
warm-end loss
-
waste-heat loss
-
water loss
-
watt loss
-
weight loss
-
wheeling loss
-
windage loss -
16 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
Франко-русский словарь нормативно-технической терминологии > courant admissible, m
-
17 courant permanent 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
Франко-русский словарь нормативно-технической терминологии > courant permanent admissible, m
-
18 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
Немецко-русский словарь нормативно-технической терминологии > Dauerstrombelastbarkeit, f
-
19 Strombelastbarkeit, 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
Немецко-русский словарь нормативно-технической терминологии > Strombelastbarkeit, f
-
20 continuous current-carrying capacity
длительная пропускная способность по току
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
(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
Англо-русский словарь нормативно-технической терминологии > continuous current-carrying capacity
- 1
- 2
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