voltage behind subtransient reactance of a synchronous generator

例句：

1. 1.The subtransient current is the current flowing through a conductor during a short-circuit.
   暂态电流是导体在短路时流过的电流。
2. 2. Subtransient oscillations occur when the magnetic field changes rapidly.
   暂态振荡发生时，磁场迅速变化。
3. 3. The subtransient response of the circuit to a sudden change in voltage is known as the impedance.
   电路对电压突然变化的暂态响应称为阻抗。