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1 анализ шума
анализ шума
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noise analysis
Determination of the frequency components that make up a particular noise being studied. (Source: MGH)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-французский словарь нормативно-технической терминологии > анализ шума
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2 интергармоника
интергармоника
Интергармониками называют токи (напряжения) частота которых не кратна частоте основной гармоники.EN
interharmonic component
sinusoidal component of a periodic quantity having a an interharmonic frequency
NOTE 1 For brevity, such a component may be referred to simply as an interharmonic.
NOTE 2 For practical analysis, an approximation of the periodicity may be necessary.
NOTE 3 The value is normally expressed as an r.m.s. value.
NOTE 4 As stated in IEC 61000-4-7, the time window has a width of 10 fundamental periods (50 Hz systems) or 12 fundamental periods (60 Hz systems), i.e. approximately 200 ms. The difference in frequency between two consecutive interharmonic components is, therefore, approximately 5 Hz. In the case of other fundamental frequencies, the time window should be selected between 6 fundamental periods (approximately 1 000 ms at 6 Hz) and 18 fundamental periods (approximately 100 ms at 180 Hz).
[IEC 60146-1-1, ed. 4.0 (2009-06)]FR
composante interharmonique
composante sinusoïdale d’une grandeur périodique dont la fréquence est une fréquence interharmonique
NOTE 1 Pour des raisons de concision, ce type de composante peut être désigné simplement par le terme « interharmonique ».
NOTE 2 Pour l’analyse pratique, il peut être nécessaire de procéder à une approximation de la périodicité.
NOTE 3 La valeur est normalement exprimée comme une valeur efficace.
NOTE 4 Comme indiqué dans la CEI 61000-4-7, la fenêtre temporelle a une largeur de 10 périodes fondamentales (systèmes de 50 Hz) ou de 12 périodes fondamentales (systèmes de 60 Hz), c’est-à-dire approximativement 200 ms. La différence de fréquence entre deux composantes interharmoniques consécutives est, par conséquent, d’environ 5 Hz. Dans le cas d’autres fréquences fondamentales, il convient de choisir la fenêtre temporelle entre 6 périodes fondamentales (environ 1 000 ms à 6 Hz) et 18 périodes fondamentales (environ 100 ms à 180 Hz). [IEC 60146-1-1, ed. 4.0 (2009-06)]
Токи и напряжения интергармоник могут возникать как в низковольтных электрических сетях, так и в сетях среднего и высокого напряжения. Интергармоники, возникающие в электрических сетях среднего и высокого напряжения, передаются в питаемые ими низковольтные электрические сети. Возможен обратный процесс передачи интергармоник из электрических сетей низкого напряжения в сети среднего и высокого напряжения. [ ГОСТ Р 51317.4.13-2006]
На частотах, расположенных между частотами гармонических составляющих тока и напряжения, могут наблюдаться интергармоники. Интергармоники могут возникать на дискретных частотах или иметь спектральные составляющие в достаточно широкой полосе частот. Суммарное воздействие различных источников интергармоник маловероятно и в настоящем стандарте не учитывается.
Полного понимания природы электромагнитных возмущений, ассоциирующихся с интергармониками, еще нет, и в настоящее время к этому явлению возник повышенный интерес. Интергармоники всегда присутствуют в системе электроснабжения, но в последнее время с резким увеличением силовых электронных систем их практическое влияние стало более ощутимым.
[Збигнев Ханзелка (Zbigniew Hanzelka), Анжей Бьень (Andrzej Bien) AGH-UST, Краков, Республика Польша. Энергосбережение №7/2005]Тематики
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Русско-французский словарь нормативно-технической терминологии > интергармоника
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3 обработка питьевой воды
обработка питьевой воды
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
drinking water treatment
The Directive on the Quality of Surface Water Intended for Drinking Water defines three categories of water treatment (A1, A2, A3) from simple physical treatment and disinfection to intensive physical and chemical treatment. The treatment to be used depends on the quality of the water abstracted. The Directive uses imperative values for parameters known to have an adverse effect on health and also guide values for those which are less adverse. There is also a directive which complements the "surface water abstraction" Directive by indicating the methods of measurement and the frequency of sampling and analysis required. (Source: PORT)
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Русско-французский словарь нормативно-технической терминологии > обработка питьевой воды
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