The phase selection system is consist of DSP,PLL circuit and N divider. The system changes the sampling frequency as the signal frequency changed,so always keeps multiples,in order to eliminate the measurement error.
该选相合闸系统由DSP,锁相环电路和N分频器组成,控制采样频率随着信号频率的变化而变化,使其始终保持整数倍关系,从而消除测算误差。
参考来源 - 选相合闸FFT算法的误差分析与对策Now these functions are realized by electronic circuit and got used widely in phase selection devices.
目前广泛采用的选相分合闸机构，大多由电子线路实现上述功能。
参考来源 - 交流电器选相分合闸的控制技术Accordingly, five immiscibleW-based binary fcc-bcc and hcp-bcc metal systems, i. e, Cu-W, Ag-W, Au-W,Sc-W and Y-W systems, and miscible Co-Nb systems, were selected to studythe formation of metastable phase selection and glass formation ability.
为此,本论文选择了五个生成热为正的W基二元fcc-bcc和hcp-bcc金属系统,即:Cu-W、Ag-W、Au-W、Sc-W和Y-W系统,和一个生成热为负的Co-Nb系统来研究其亚稳相选择和非晶形成能力。
参考来源 - 合金相形成的热力学、分子动力学模拟及离子束混合研究·2,447,543篇论文数据，部分数据来源于NoteExpress
As phase selection schemes, they can be used for perfect digital relay.
因此可作为数字式保护的较理想的选相元件方案。
Now these functions are realized by electronic circuit and got used widely in phase selection devices.
目前广泛采用的选相分合闸机构，大多由电子线路实现上述功能。
In this paper, a new type of phase selection element used for EHV power system is studied and suggested.
本文研究提出了一种适用于超高压电力系统的新型选相元件。
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