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。
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