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Book
ISBN: 146736312X 1467363111 1467363138 Year: 2013 Publisher: [Place of publication not identified] : Institute of Electrical and Electronics Engineers,
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ISBN: 0738106615 Year: 1992 Publisher: [Place of publication not identified] : IEEE,
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Practical instrumentation methods are presented for measuring the ac characteristics of large, extended or interconnected grounding systems. Measurements of impedance to remote earth, step and touch potentials, and current distributions are covered for grounding systems ranging in complexity from small grids (less than 900m 2), with only a few connected overhead or direct burial bare concentric (2) neutrals, to large grids (greater than 20 000m 2), with many connected neutrals, overhead ground wires (sky wires), counterpoises, grid tie conductors, cable shields, and metallic pipes. This standard addresses measurement safety; earth-return mutual errors; low-current measurements; power-system staged faults; communication and control cable transfer impedance; current distribution (current splits) in the grounding system; step, touch, mesh, and profile measurements; the foot-equivalent electrode earth resistance; and instrumentation characteristics and limitations.
Book
ISBN: 1504408292 Year: 2016 Publisher: [Place of publication not identified] : IEEE,
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ISBN: 1504481720 Year: 2022 Publisher: New York : IEEE,
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Guidance for the use and application of Rogowski coils (RCs) (air-core current sensors) for protective relaying in electric power systems is described and provided in this guide. The selection and application of RCs for the more common protection schemes are also addressed.
ISBN: 9782020486781 2020486784 Year: 2005 Publisher: Paris: Seuil,
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Dans ma famille, de tradition catholique, nos prières se devaient de rendre hommage à Dieu (pour l'ensemble de son œuvre). Mais, tout de suite après, il nous fallait dire notre gratitude au Gulf Stream (pour la chaleur de l'eau et la tiédeur de l'air). Chaque fois que nous sortions, grelottants, de nos bains glacés de Bretagne, une grand-mère était là pour s'exclamer : " Remercie donc le Gulf Stream ! Sans lui, notre mer serait froide. " Et chacune de nos promenades au jardin s'accompagnait de gloussements : " Qu'il se porte bien ce palmier, il me rappelle Alger. Qu'il monte haut cet agave, on dirait Madagascar ! " Au fond, le Gulf Stream nous consolait de la perte de nos colonies. Bien des années ont passé. Et aujourd'hui mon cher Gulf Stream m'inquiète. Sa santé me préoccupe. Va-t-il un jour, bientôt, comme on le dit, s'arrêter de couler ? Qu'adviendra-t-il de la douceur de nos climats ? Longtemps, j'ai fermé les yeux. Mais le moment est venu. Je ne suis pas scientifique. Plutôt promeneur. Alors, des violents remous du détroit de Floride aux maelströms de Norvège, des rivages fleuris d'Ecosse aux abords légendaires de Nantucket, je suis allé, par les chemins de terre ou de mer, rencontrer les savants et les lieux.
Book
Year: 1964 Publisher: Amsterdam : Elsevier,
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Dissertation
Year: 1863 Publisher: Utrecht : T. De Bruyn,
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Book
Year: 1827 Publisher: Berlin : T. H. Riemann,
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Book
Year: 1933 Publisher: Göteborg, : Elanders boktr.,
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Year: 2004 Publisher: Karlsruhe : Univ.-Verl. Karlsruhe,
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In dieser Arbeit wird ein tiefengemitteltes Large-Eddy-Simulationsverfahren für Flachwasserströmungen entwickelt. Dazu liefern umfangreiche dreidimensionale LES-Rechnungen Informationen über die in den tiefengemittelten Gleichungen zu modellierenden Terme.Als Anwendungen werden unter anderem die ausgebildete Gerinneströmung, die Zylinderumströmung, eine Mischungsschicht sowie die Strömung in einem Buhnenfeld betrachtet.
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