In both of the cases above, the shiftvoltage of neutral point often appears. So one does not differ from the other easily, especially for the fundamental frequency ferro-resonance.
且由于二者往往均表现为中性点出现位移电压，尤其是基波谐振更不易与单相接地区分。
2
The relationship between the control voltage and the current output by the constant-current source may shift.
控制电压和由恒流电源输出的电流之间的关系改变可能会产生漂移。
3
Applying a voltage between the electrodes causes a simultaneous shift in the particles in all the capsules in a block, thus changing its colour.