-
1 maximum allowed power flow
Энергосистемы: максимально допустимый перетокУниверсальный англо-русский словарь > maximum allowed power flow
-
2 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
-
3 ampacity (US)
(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 > ampacity (US)
-
4 continuous current
(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
непрерывный ток
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999]Тематики
- электротехника, основные понятия
EN
Англо-русский словарь нормативно-технической терминологии > continuous current
-
5 current-carrying capacity
(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
предельно допустимый ток
—
[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
прочность печатной платы к токовой нагрузке
Свойство печатной платы сохранять электрические и механические характеристики после воздействия максимально допустимой токовой нагрузки на печатный проводник или металлизированное отверстие печатной платы.
[ ГОСТ Р 53386-2009]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > current-carrying capacity
-
6 level
1) уровеньб) ранг; позиция; категория; иерархическое положениев) амплитуда; интенсивность; относительное значениег) нивелир; ватерпас2) регулировать уровень; устанавливать уровень (напр. освещённости)3) приводить к одинаковому уровню; выравнивать; сглаживать; устранять отличия; нивелировать4) громкость || регулировать громкость5) ранжировать; определять позицию; относить к (определённой) категории; устанавливать степень субординации в иерархии6) горизонтальная линия или плоскость; ровная поверхность, плоская поверхность || устанавливать в горизонтальной плоскости; выравнивать; нивелировать; устанавливать по уровню или ватерпасу7) степень (напр. интеграции)10) рлк нацеливать; наводить; прицеливаться•- level of interactivity
- level within factor - acceptor level
- acceptor impurity level
- accuracy level
- activity level
- adaptation level
- algorithmic level
- allowed level
- allowed energy level
- alpha level
- alpha-geometric level
- alphamosaic level
- ambient level
- amplitude-modulation noise level
- atomic energy level
- audio-signal output level
- average picture level
- background level
- back-lobe level
- band-gap level
- band-power level
- band-pressure level
- base level
- behavioral level
- bit level
- black level
- blacker-than-black level
- blanking level
- brightness level
- bus interface level
- call-tone level
- carrier level
- carrier-noise level
- charged trapping level
- charge-storage level
- chorus level
- chromatic level
- circuit noise level
- clamp level
- clearance level
- clipping level
- common level
- compatibility level
- composite picture signal output level
- concentration level
- confidence level
- contamination level
- conventional significance level
- cross-product level - cutoff level
- data-flow level
- datagram level
- data service level
- deep level
- deep-lying level
- defect level - digital signal level
- discrete level
- discrete energy level
- donor level
- donor impurity level
- doping level
- DS level
- effective privilege level
- electric level
- electronic Zeeman level
- energy level
- entry level
- equivalent loudness level
- equivalent peak level
- exchange level
- exchange-split level
- excitation level
- exciton level
- extra level
- facsimile-signal level
- Fermi level
- Fermi characteristic energy level - floating level
- FM noise level
- foreground level
- free energy level
- function level
- functional level
- gate level
- gray level
- ground level
- ground state level
- HFS level
- high level
- higher bias level
- high logic level
- hum level
- hyperfine-structure level
- impedance level
- implementation level
- impurity level
- impurity energy level
- injection level
- input level - intensity level
- interchange level
- intermediate level
- intermediate energy level
- intrinsic level
- inversion level
- inverted level
- ISO 9660 implementation level
- ISO 9660 interchange level
- jet stream level
- jumbo cell level
- layout level
- light level
- line level
- local level
- logic level
- logical device level
- loudness level
- lower level
- lower energy level
- lowest level
- lowest energy level
- low-field level
- low logic level
- luminescent level
- mask level
- maximum record level
- maximum relative side-lobe level
- metastable level
- multiplet level
- neutral level
- noise level
- occupied energy level
- octave-band pressure level
- operate level of echo suppressor
- orbital energy level
- overload level
- partially filled level
- partially occupied level
- peak signal level
- peak sound-pressure level
- pedestal level
- perceived noise level
- perturbed level
- perturbed energy level
- phonon level
- power level
- power spectrum level
- precedence level
- pressure spectrum level
- price level
- printthrough level
- probability level
- program level
- pumping level
- quantization level
- quantizing level
- quasi-Fermi level
- recording level
- redundancy level
- reference level
- reference black level
- reference white level
- register transfer level
- relative co-polar side-lobe level
- relative cross-polar side-lobe level
- reorder level
- requested privilege level
- resistivity level
- resonance level
- risk level
- rotational level
- rotational energy level
- saturation level
- sensation level
- shallow impurity level
- side-lobe level
- signal level
- significance level
- singlet level
- soil level
- sound level
- sound-energy flux density level
- sound-power level
- sound-pressure level
- specific sound-energy flux level
- speech level
- strong-field level
- surface level
- switching level
- sync level
- synchronizing level
- system level
- television level
- testing level
- test's significance level
- threshold level
- through level
- timing level
- tolerable noise level
- transducer overload level
- transmission level
- trapping level
- trigger level
- triplet level
- true level
- turntable spirit level
- unaffected level
- unfilled level
- unfilled energy level
- unoccupied level
- unoccupied energy level
- upper level
- upper energy level
- usable levels
- vacant energy level
- vacuum level
- variable quantizing level
- variation level
- velocity level
- vibrational level
- vibrational energy level
- virtual level
- virtual energy level
- voltage level
- weighted noise level
- white level
- Zeeman energy level
- zero level -
7 level
1) уровеньб) ранг; позиция; категория; иерархическое положениев) амплитуда; интенсивность; относительное значениег) нивелир; ватерпас2) регулировать уровень; устанавливать уровень (напр. освещённости)3) приводить к одинаковому уровню; выравнивать; сглаживать; устранять отличия; нивелировать4) громкость || регулировать громкость5) ранжировать; определять позицию; относить к (определённой) категории; устанавливать степень субординации в иерархии6) горизонтальная линия или плоскость; ровная поверхность, плоская поверхность || устанавливать в горизонтальной плоскости; выравнивать; нивелировать; устанавливать по уровню или ватерпасу7) степень (напр. интеграции)10) рлк. нацеливать; наводить; прицеливаться•- acceptable reliability level
- acceptor impurity level
- acceptor level
- accuracy level
- activity level
- adaptation level
- algorithmic level
- allowed energy level
- allowed level
- alpha level
- alpha-geometric level
- alphamosaic level
- ambient level
- amplitude-modulation noise level
- atomic energy level
- audio-signal output level
- average picture level
- background level
- back-lobe level
- band-gap level
- band-power level
- band-pressure level
- base level
- behavioral level
- bit level
- black level
- blacker-than-black level
- blanking level
- brightness level
- bus interface level
- call-tone level
- carrier level
- carrier-noise level
- charged trapping level
- charge-storage level
- chorus level
- chromatic level
- circuit noise level
- clamp level
- clearance level
- clipping level
- common level
- compatibility level
- composite picture signal output level
- concentration level
- confidence level
- contamination level
- conventional significance level
- cross-product level
- C-scale sound level in decibels
- current privilege level
- cutoff level
- data service level
- data-flow level
- datagram level
- deep level
- deep-lying level
- defect level
- descriptor privilege level
- device level
- digital signal level
- discrete energy level
- discrete level
- donor impurity level
- donor level
- doping level
- DS level
- effective privilege level
- electric level
- electronic Zeeman level
- energy level
- entry level
- equivalent loudness level
- equivalent peak level
- exchange level
- exchange-split level
- excitation level
- exciton level
- extra level
- facsimile-signal level
- Fermi characteristic energy level
- Fermi level
- FIDO/opus/Seadog standard interface level
- filled energy level
- floating level
- FM noise level
- foreground level
- free energy level
- function level
- functional level
- gate level
- gray level
- ground level
- ground state level
- HFS level
- high level
- high logic level
- higher bias level
- hum level
- hyperfine-structure level
- impedance level
- implementation level
- impurity energy level
- impurity level
- injection level
- input level
- input/output privilege level
- integration level
- intensity level
- interchange level
- intermediate energy level
- intermediate level
- intrinsic level
- inversion level
- inverted level
- ISO 9660 implementation level
- ISO 9660 interchange level
- jet stream level
- jumbo cell level
- layout level
- level of details
- level of integration
- level of interactivity
- level within factor
- light level
- line level
- local level
- logic level
- logical device level
- loudness level
- low logic level
- lower energy level
- lower level
- lowest energy level
- lowest level
- low-field level
- luminescent level
- mask level
- maximum record level
- maximum relative side-lobe level
- metastable level
- multiplet level
- neutral level
- noise level
- occupied energy level
- octave-band pressure level
- operate level of echo suppressor
- orbital energy level
- overload level
- partially filled level
- partially occupied level
- peak signal level
- peak sound-pressure level
- pedestal level
- perceived noise level
- perturbed energy level
- perturbed level
- phonon level
- power level
- power spectrum level
- precedence level
- pressure spectrum level
- price level
- printthrough level
- probability level
- program level
- pumping level
- quantization level
- quantizing level
- quasi-Fermi level
- recording level
- redundancy level
- reference black level
- reference level
- reference white level
- register transfer level
- relative co-polar side-lobe level
- relative cross-polar side-lobe level
- reorder level
- requested privilege level
- resistivity level
- resonance level
- risk level
- rotational energy level
- rotational level
- saturation level
- sensation level
- shallow impurity level
- side-lobe level
- signal level
- significance level
- singlet level
- soil level
- sound level
- sound-energy flux density level
- sound-power level
- sound-pressure level
- specific sound-energy flux level
- speech level
- strong-field level
- surface level
- switching level
- sync level
- synchronizing level
- system level
- television level
- testing level
- test's significance level
- threshold level
- through level
- timing level
- tolerable noise level
- transducer overload level
- transmission level
- trapping level
- trigger level
- triplet level
- true level
- turntable spirit level
- unaffected level
- unfilled energy level
- unfilled level
- unoccupied energy level
- unoccupied level
- upper energy level
- upper level
- usable levels
- vacant energy level
- vacuum level
- variable quantizing level
- variation level
- velocity level
- vibrational energy level
- vibrational level
- virtual energy level
- virtual level
- voltage level
- weighted noise level
- white level
- Zeeman energy level
- zero levelThe New English-Russian Dictionary of Radio-electronics > level
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8 Allen, John F.
SUBJECT AREA: Steam and internal combustion engines[br]b. 1829 Englandd. 2 October 1900 New York (?), USA[br]English inventor of the Allen valve used on his pioneering high-speed engines.[br]Allen was taken to the United States from England when he was 12 years old. He became an engineer on the Curlew, a freight boat running between New York and Providence. A defect which caused the engine to race in rough weather led Allen to invent a new valve gear, but he found it could not be fitted to the Corliss engine. In 1856 he patented an improved form of valve and operating gear to reduce back-pressure in the cylinder, which was in fact the reverse of what happened in his later engines. In 1860 he repaired the engines of a New York felt-hat manufacturer, Henry Burr, and that winter he was introduced to Charles Porter. Porter realized the potential of Allen's valves for his idea of a high-speed engine, and the Porter-Allen engine became the pioneer of high-speed designs.Porter persuaded Allen to patent his new valves and two patents were obtained in 1862. These valves could be driven positively and yet the travel of the inlet could be varied to give the maximum expansion at different cut-offs. Also, the valves allowed an exceptionally good flow of steam. While Porter went to England and tried to interest manufacturers there, Allen remained in America and continued work on the engine. Within a few years he invented an inclined watertube boiler, but he seemed incapable of furthering his inventions once they had been placed on the market. Although he mortgaged his own house in order to help finance the factory for building the steam engine, in the early 1870s he left Porter and built a workshop of his own at Mott Haven. There he invented important systems for riveting by pneumatic machines through both percussion and pressure which led into the production of air compressors and riveting machines.[br]Further ReadingObituaries appeared in engineering journals at the time of his death.Dictionary of American Biography, 1928, Vol. I, New York: C.Scribner's Sons. C.T.Porter, 1908, Engineering Reminiscences, New York: J.Wiley \& Sons, reprint 1985, Bradley, Ill.: Lindsay Publications (provides details of Allen's valve design).R.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (covers the development of the Porter-Allen engine).RLH -
9 Corliss, George Henry
SUBJECT AREA: Steam and internal combustion engines[br]b. 2 June 1817 Easton, Washington City, New York, USAd. 21 February 1888 USA[br]American inventor of a cut-off mechanism linked to the governor which revolutionized the operation of steam engines.[br]Corliss's father was a physician and surgeon. The son was educated at Greenwich, New York, but while he showed an aptitude for mathematics and mechanics he first of all became a storekeeper and then clerk, bookkeeper, salesperson and official measurer and inspector of the cloth produced at W.Mowbray \& Son. He went to the Castleton Academy, Vermont, for three years and at the age of 21 returned to a store of his own in Greenwich. Complaints about stitching in the boots he sold led him to patent a sewing machine. He approached Fairbanks, Bancroft \& Co., Providence, Rhode Island, machine and steam engine builders, about producing his machine, but they agreed to take him on as a draughtsman providing he abandoned it. Corliss moved to Providence with his family and soon revolutionized the design and construction of steam engines. Although he started working out ideas for his engine in 1846 and completed one in 1848 for the Providence Dyeing, Bleaching and Calendering Company, it was not until March 1849 that he obtained a patent. By that time he had joined John Barstow and E.J.Nightingale to form a new company, Corliss Nightingale \& Co., to build his design of steam-engines. He used paired valves, two inlet and two exhaust, placed on opposite sides of the cylinder, which gave good thermal properties in the flow of steam. His wrist-plate operating mechanism gave quick opening and his trip mechanism allowed the governor to regulate the closure of the inlet valve, giving maximum expansion for any load. It has been claimed that Corliss should rank equally with James Watt in the development of the steam-engine. The new company bought land in Providence for a factory which was completed in 1856 when the Corliss Engine Company was incorporated. Corliss directed the business activities as well as technical improvements. He took out further patents modifying his valve gear in 1851, 1852, 1859, 1867, 1875, 1880. The business grew until well over 1,000 workers were employed. The cylindrical oscillating valve normally associated with the Corliss engine did not make its appearance until 1850 and was included in the 1859 patent. The impressive beam engine designed for the 1876 Centennial Exhibition by E. Reynolds was the product of Corliss's works. Corliss also patented gear-cutting machines, boilers, condensing apparatus and a pumping engine for waterworks. While having little interest in politics, he represented North Providence in the General Assembly of Rhode Island between 1868 and 1870.[br]Further ReadingMany obituaries appeared in engineering journals at the time of his death. Dictionary of American Biography, 1930, Vol. IV, New York: C.Scribner's Sons. R.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (explains Corliss's development of his valve gear).J.L.Wood, 1980–1, "The introduction of the Corliss engine to Britain", Transactions of the Newcomen Society 52 (provides an account of the introduction of his valve gear to Britain).W.H.Uhland, 1879, Corliss Engines and Allied Steam-motors, London: E. \& F.N.Spon.RLH
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