When a short circuit occurs, becaus

When a short circuit occurs, because the impedance of the short circuit circuit circuit is very small, the short circuit current generated is tens of times larger than the normal current, sometimes as high as tens of thousands or even hundreds of thousands of amperes. At the same time, when the system voltage drops, the closer the short-circuit point is, the greater the voltage drop is. When the three-phase short-circuit occurs, the voltage of the short-circuit point may drop to zero, so the short-circuit will cause serious harm. It is shown in the following aspects