Single-phase analysis method and three-phase analysis method are discussed, and single-phase models and three-phase models of a. c. power system main elements are presented in this paper by introducing the principle of penetration.
本文通过介绍渗透分析的原理，阐述了电力系统的单相分析法和三相分析法，对电力系统主要元件进行了单相建模和三相建模。
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The three-phase analysis method should be applied for the distribution calculation of electrical traction load in the electrical system.
电力牵引负荷在电力系统中的分布计算宜采用三相分析法。
The analysis of vibration is introduced by its three factors-vibration amplitude, frequency and phase.
针对振动的三要素即振幅、频率及相位分别做了介绍；
Phase components method may offer advantages in the analysis of unbalanced three-phase networks.
使用相分量方法在分析电力系统三相不对称网络时更加方便。
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