The control circuit calculates the phase-to-phase voltages from the phase-to-ground voltages.
控制电路从单相接地电压计算得出相间电压。
Error analysis result shows that biased capacitor method can meet the need of measurement accuracy while the unbalance of three phase voltages is relatively small.
误差分析表明，偏置电容法在三相电压不平衡度较小时可以满足测量精度的要求。
Considering the imbalance of three phase voltages, a new arithmetic which verifies the generator paralleling based on the synthetic phasor of positive sequence fundamental voltage is proposed.
考虑到三相电压或多或少有些不平衡，提出了一种新的基于正序基波电压合成相量的发电机并网条件核算法。
This effect can be measured in either the time domain by observing the rate of decay of voltage or in the frequency domain by measuring phase shifts between sinusoidal currents and voltages.
这个效应可以在时间域通过观测电压的衰变率来测量，也可以在频率域通过正弦电流和电压之间的相变来测量。
This means the difference of magnitude, frequency and phase of the voltages between the two sides of breaker must be small enough.
这就要求并列合闸时断路器两侧电压的幅值差、频率差和相角差都足够小。
FPGA is used to produce the SPWM frequency and phase for each inverter and ensures the synchronization of output voltages.
该控制技术利用FPGA产生各并联逆变器SPWM调制波的频率和相位，并确保输出电压同步。
Simulation results of making process for different phase angles of flow driven by full bridge rectifier are given and analyzed at rated and variable voltages in detail.
文中给出了全桥整流驱动额定电压情况下不同开通角时合闸过程及电压变化时的仿真结果，并对仿真结果作了细致分析。
It is found that the input current produces distortion even if the three-phase input voltages are balanced.
也发现即使三相输入电压平衡，输入电流也存在失真现象。
Unbalances appear in a three-phase system when voltages or currents differ from on phase.
三相系统中，某的电压或电流与其它相不相同时，就出现幅值与或。
Three-phase unbalanced voltages have great effects on the performance of a line-start permanent magnet synchronous motor.
三相电压不对称对永磁同步电动机的性能影响较大。
When determine whether the three phases are in balance, directly measuring phase residual voltages to ground is proved to be inaccurate.
通过测量各相对地的残压来判定发电机三相是否对称的方法是不准确的。
A three-phase alternating current parameters instrument to be used in industry is designed. It can measure the voltages, currents, power factors of each phase of three-phase alternating current.
设计开发一种工业用三相交流电参数仪，能够测得三相交流电各相的电压、电流、功率、功率因子等参数；
Here deflecting a beam is accomplished by forming phase distribution that similar to binary grating phase's through modulating applied voltages.
本文通过计算机编程控制栅指电压，使液晶相控阵形成类似二元光栅的相位分布，实现对入射光的偏转。
Firstly, according to the mathematical analysis, the model is established and formulas are deduced to calculate phase angles and line voltages.
首先通过数理分析，建立数学模型，推导公式，计算相位角变化值和线电压值。
Firstly, according to the mathematical analysis, the model is established and formulas are deduced to calculate phase angles and line voltages.
首先通过数理分析，建立数学模型，推导公式，计算相位角变化值和线电压值。
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