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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Three-phase ： ウィキペディア英語版 Three-phase In electrical engineering, three-phase electric power systems have at least three conductors carrying alternating current voltages that are offset in time by one-third of the period. A three-phase system may be arranged in delta (∆) or star (Y) (also denoted as wye in some areas). A wye system allows the use of two different voltages from all three phases, such as a 230/400 V system which provides 230 V between the neutral (centre hub) and any one of the phases, and 400 V across any two phases. A delta system arrangement only provides one voltage magnitude, however it has a greater redundancy as it may continue to operate normally with one of the three supply windings offline, albeit at 57.7% of total capacity.〔http://www.ibiblio.org/kuphaldt/socratic/output/deltawye_instructor.pdf public domain〕 Harmonic currents in the neutral may become very large if non-linear loads are connected. ==Definitions== In a star (wye) connected topology, with rotation sequence L1 - L2 - L3, the time-varying instantaneous voltages can be calculated for each phase A,C,B respectively by: : $V\_=\backslash sin\; \backslash left(\backslash theta\backslash right)$ * V_P\,\! : $V\_=\backslash sin\; \backslash left(\backslash theta\; -\backslash frac\; \backslash pi\backslash right)$ * V_P = \sin \left(\theta +\frac \pi\right) * V_P : $V\_=\backslash sin\; \backslash left(\backslash theta-\backslash frac\; \backslash pi\backslash right)$ * V_P = \sin \left(\theta+\frac \pi\right) * V_P where: :$V\_P$ is the peak voltage, :$\backslash theta=2\backslash pi\; ft\backslash ,\backslash !$ is the phase angle in radians ::$t$ is the time in seconds ::$f$ is the frequency in cycles per second and :voltages L1-N, L2-N and L3-N are referenced to the star connection point. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Three-phase」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.