Due to three-phase capacitance toground, certain voltage exists between the neutral and the ground for a generator with ungrounded neutral.
对于中性点不直接接地的发电机，由于三相对地电容值存在差异，中性点与地之间存在一定电压。
2
When a fault occurs on one phase of a 3-phase, 4-wire system, the other two phases rise in voltage relative toground (about 20%).
当故障发生在3相4线系统中的一相时，其它两相的对地电压就升高（约升高20%）。 好评（0）
3
Small Current Grounding Power System is widely used in power distribution network with middle and low voltage in china, and the single phasetoground fault takes place most frequently in such system.