四相线路可以采用两相邻相运行，能提高输电系统运行的可靠性与暂态稳定性。
The reliability and transient stability of the transmission system may be improved, because two adjacent phase conductors of four-phase transmission lines can be operable.
系统由半导体激光器、聚焦镜头、反射式标尺光栅、四裂相指示光栅和光电接收元件组成。
The article touches upon the principle of displacement measuring system consisting of diode laser focusing lens, reflecting main scale grating, quarternary index scale grating photosensor.
四相输电系统的故障分析，是研究四相输电理论的一项重要内容。
Four-phase transmission system fault analysis is one of the important studies on four-phase transmission system theory.
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