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1 на расстоянии ... друг от друга
••The two detectors are placed (or spaced) 100 ft apart.
•The holes are spaced at 10 ft intervals.
* * *На расстоянии... друг от друга-- Two quartz crystal transducers were flush mounted 30.5 cm apart in the wall of the tube.Русско-английский научно-технический словарь переводчика > на расстоянии ... друг от друга
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2 на расстоянии ... друг от друга
••The two detectors are placed (or spaced) 100 ft apart.
•The holes are spaced at 10 ft intervals.
Русско-английский научно-технический словарь переводчика > на расстоянии ... друг от друга
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3 возникать
•The repulsion between two electrons comes about from the exchange of photons.
•An earthquake is generated (or develops, or occurs) when two blocks...
•The potential appearing across the output terminal is...
•These forces arise from the displacement of the aileron.
•The methylamines are widely distributed in nature where they arise probably as the result of decomposition of...
•The strains that are brought about in steel during the hardening process...
•Planets may come into being (or existence, or may result) when small planetesimals fall together.
•Above 1000°F another process is coming into play.
•The pipe developed a leak ( в трубе возникла течь).
•Under such conditions, it is possible that a crack may develop in a furnace.
•All tools develop ( во всех инструментах возникают) residual internal stresses.
•Under these conditions a bias will be developed because of the flow of electrons from grid to ground.
•Problems invariably occur which call for...
•A wave originating at point can reach any of the several detectors.
•No known meteorites seem to have originated on the Moon.
•A model of this type can be changed many times during the construction as new problems present themselves.
•The temperature at which the disorder sets in is a function of...
•Chemistry grew out of the black magic of the dark ages and the alchemy of the middle ages.
•This definition came about because it simplified the study of control systems.
•A dispute which ensued between the two groups...
•These forces are generated in the earth's interior.
•Shear is produced in columns by () variation in...
II•Ultimately, a molecule similar to modern catalase came into existence.
•Brain tumours are not likely to arise from a mature neuron.
•Planets may result [or come into being (or existence)] when small planetesimals fall together.
•As a result there occurs what is known as the Cerenkov effect.
•These craters date back to a period of...
•Planets may evolve into existence when...
•Interest in developing... goes back to the 1950s.
•Such forces occur when...
•In our galaxy, supernovae occur once every 30 years or so.
•Three questions might come to mind about the properties of...
* * *Возникать -- to appear, to develop (появляться), to arise, to come into being; to emerge, to originate (о трудностях, вопросах)Several problems have arisen during the course of the work which have required system development.Did the Neolithic of southern Greece really come into being as abruptly as it now appears it did?To troubleshoot a scale system problem, first determine in which scale system element the problem originates.Русско-английский научно-технический словарь переводчика > возникать
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4 возникать
•The repulsion between two electrons comes about from the exchange of photons.
•An earthquake is generated (or develops, or occurs) when two blocks...
•The potential appearing across the output terminal is...
•These forces arise from the displacement of the aileron.
•The methylamines are widely distributed in nature where they arise probably as the result of decomposition of...
•The strains that are brought about in steel during the hardening process...
•Planets may come into being (or existence, or may result) when small planetesimals fall together.
•Above 1000°F another process is coming into play.
•The pipe developed a leak ( в трубе возникла течь).
•Under such conditions, it is possible that a crack may develop in a furnace.
•All tools develop ( во всех инструментах возникают) residual internal stresses.
•Under these conditions a bias will be developed because of the flow of electrons from grid to ground.
•Problems invariably occur which call for...
•A wave originating at point can reach any of the several detectors.
•No known meteorites seem to have originated on the Moon.
•A model of this type can be changed many times during the construction as new problems present themselves.
•The temperature at which the disorder sets in is a function of...
•Chemistry grew out of the black magic of the dark ages and the alchemy of the middle ages.
•This definition came about because it simplified the study of control systems.
•A dispute which ensued between the two groups...
•These forces are generated in the earth's interior.
•Shear is produced in columns by () variation in...
II•Ultimately, a molecule similar to modern catalase came into existence.
•Brain tumours are not likely to arise from a mature neuron.
•Planets may result [or come into being (or existence)] when small planetesimals fall together.
•As a result there occurs what is known as the Cerenkov effect.
•These craters date back to a period of...
•Planets may evolve into existence when...
•Interest in developing... goes back to the 1950s.
•Such forces occur when...
•In our galaxy, supernovae occur once every 30 years or so.
•Three questions might come to mind about the properties of...
Русско-английский научно-технический словарь переводчика > возникать
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5 НКУ с устройствами ограничения воздействия внутренней дуги
НКУ с устройствами ограничения воздействия внутренней дуги
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[Интент]Параллельные тексты EN-RU
Assemblies equipped with devices limiting internal arc effects (active protection)
A design philosophy which is completely different from that just considered consists in guaranteeing the resistance to internal arcing by installing devices limiting the arc.
The approaches in that direction can be of two different types:
• limiting the destructive effects of the arc, once it has occured, by means of arc detectors
• limiting the destructive effects of the arc, once it has occured, by means of overpressure detectors.
The first possibility consists in installing in the assembly arc detectors which sense the light flux associated with the electric arc phenomenon.
Once the arc has been detected, these devices send an opening signal to the incoming circuit-breaker, thus guaranteeing tripping times of the order of 1-2 ms, therefore shorter than those proper of the circuit-breaker.
The operating logic of an arc detector is the following: the occurrence of an arc inside the switchboard is detected by the arc detector because an intense light radiation is associated with this phenomenon.
The arcing control system detects the event and sends a tripping signal to the circuit-breaker.
All the above with trip times of a few milliseconds and supplanting the tripping of the CB overcurrent relay which, for example, could be delayed due to current selectivity questions.
Figure 1 shows the possible positions where this device can be installed inside a switchboard.
The ideal solution is that which provides the installation of at least one detector for each column, with the consequent reduction to a minimum of the length of the optical fibers carrying the signal.
In order to prevent from an unwanted tripping caused by light sources indepent of the arc (lamps, solar radiation etc.), an additional current sensor is often positioned at the incoming of the main circuit-breaker.
Only in the event of an arc, both the incoming sensor which detects an “anomalous” current due to the arc fault as well as the sensor detecting the light radiation as sociated with the arc enable the system to intervene and allow the consequent opening of the circuit-breaker.
The second possibility consists in installing overpressure sensors inside the switchboard.
As previously described, the overpressure wave is one of the other effects occurring inside an assembly in case of arcing.
As a consequence it is possible to install some pressure sensors which are able to signal the pressure peak associated with the arc ignition with a delay of about 10-15 ms.
The signal operates on the supply circuit-breaker without waiting for the trip times of the selectivity protections to elapse, which are necessarily longer.
Such a system does not need any electronic processing device, since it acts directly on the tripping coil of the supply circuit-breaker.
Obviously it is essential that the device is set at fixed trip thresholds.
When an established internal overpressure is reached, the arc detector intervenes.
However, it is not easy to define in advance the value of overpressure generated by an arc fault inside a switchboard.
[ABB]НКУ с устройствами ограничения воздействия внутренней дуги (активная защита)
Для решения этой задачи используются совершенно другие, отличающиеся от ранее рассмотренных, принципы, заключающиеся в том, что противодействие внутренней дуге обеспечивается применением устройств, ограничивающих саму дугу.
Существует два типа решения проблемы в этом направлении:
• ограничение разрушающего воздействия дуги после того, как ее обнаружат специальные устройства
• ограничение разрушающего воздействия дуги после того, как специальные устройства обнаружат возникновение избыточного давления.
В первом случае в НКУ устанавливают устройства обнаружения дуги, реагирующие на световой поток, сопровождающий явление электрической дуги.
При обнаружении дуги данные устройства посылают сигнал управления на размыкание вводного автоматического выключателя. Гарантируемое время реакции составляет 1-2 мс, что меньше времени срабатывания автоматического выключателя.
Логика работы устройства обнаружения дуги следующая: Дуга, возникшая внутри НКУ, обнаруживается датчиком, реагирующим на интенсивное световое излучение, которым сопровождается горение дуги.
Обнаружив дугу, система управления посылает сигнал автоматическому выключателю.
Время срабатывания датчика и системы управления составляет несколько миллисекунд, что меньше времени срабатывания автоматического выключателя, осуществляющего защиту от сверхтока, который обычно для обеспечения требуемой селективности срабатывает с задержкой.
На рис. 1 показаны места возможной установки устройства защиты внутри НКУ.
Идеальным решением является установка, по крайней мере, одного устройства защиты в каждый шкаф многошкафного НКУ.
Это позволит до минимума сократить длину оптоволоконных кабелей передачи сигнала.
Для предотвращения ложного срабатывания от других источников света (т. е. не от дуги), например, таких как лампы, солнечное излучение и т. п., дополнительно в главной цепи вводного автоматического выключателя устанавливают датчик тока.
Только при наличии двух событий, а именно: срабатывания датчика света и обнаружения аномального увеличения тока, система управления считает, что возникла электрическая дуга и подает команду на отключение вводного автоматического выключателя.
Второе решение заключается в установке внутри НКУ датчика избыточного давления.
Как было описано ранее, одним из характерных проявлений электрической дуги, возникшей внутри НКУ, является ударная волна.
Это означает, что можно установить несколько датчиков давления, задачей которых является обнаружение импульса давления (с задержкой 10…15 мс), обусловленного зажиганием дуги.
Сигнал от датчиков давления поступает на вводной автоматический выключатель, который срабатывает без задержки на обеспечение селективности.
Такая система не нуждается в электронном устройстве обработки информации, поскольку воздействует непосредственно на независимый расцепитель автоматического выключателя.
Вполне понятно, что такое устройство имеет фиксированный порог срабатывания.
Датчик-реле дуги сработает, как только будет достигнуто заданное значение избыточного давления.
Следует иметь в виду, что не так легко заранее определить значение избыточного давления, которое будет создано при зажигании дуги внутри НКУ.
[Перевод Интент]Тематики
- НКУ (шкафы, пульты,...)
EN
Русско-английский словарь нормативно-технической терминологии > НКУ с устройствами ограничения воздействия внутренней дуги
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6 обычно
••Liquid diffraction patterns characteristically show one or two maxima that correspond to...
•The great majority of routinely detected events can be classified as earthquakes.
•The receptacle is conventionally 2-wire, 120-volt, 15-ampere.
•That is how the logarithms are conventionally tabulated.
•This inert phase is normally a gel structure.
•Engineering practice is to express quantities in lb/h.
•Group I members tend to have relatively few nucleosides of this sort.
•Such lasers typically generate pulses of 5—10 ns duration.
•Traditionally, the residual bottoms have been blended with lighter stocks.
•It is usual to check the... level whenever there is any doubt.
•In this application it is common (or usual) to employ...
•It is common for metabolic pathways to exhibit some form of cyclic pattern.
•The atomic weight is commonly called the mass number.
•The head gain is customarily measured in inches of water.
•It is customary to install a pump having two or three stages.
•The factor is generally taken to be equal to unity.
•A field lens is generally placed behind the reticle.
•Floating roof tanks are normally employed for prevention of loss through evaporation.
•The temperature at this point is ordinarily the same as that of the forward cylinder section.
•Where it is suspected that... it is the practice (or custom) to steam out the coils.
•In large marine installations it is standard (or usual) practice to use...
•The sensitivity for detection is typically (or usually, or generally, or commonly, or as a rule) five times as great as...
•In designing such packed columns, it is common (or general) practice to assume "piston", or "plug" flow.
•The regions of strongest divergence tend to be found over the subtropical regions.
•Many plant breeders make a practice of having different batches of seed treated with gamma rays, neutrons and one chemical mutagen.
•The usual way to stop the intrusion has been to drill... (геол.).
II•In this way dye molecules can enter more freely otherwise inaccessible dye-sites.
Русско-английский научно-технический словарь переводчика > обычно
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