SAG (or DIP) is a momentary (usually within a second) voltage drop. It is caused by lightning, rain, snow, etc. and also by the fall and short circuit of the power supply track.
Sag not only greatly affects the operation of production facilities that require high precision, but also causes huge damages such as poor quality and delayed delivery due to reduced production.
DVC instantaneously back up the power within 2ms (average 1.2ms) by using its inverter system, when momentary power failure or sag occurs, so it can prevent damage to the load equipment perfectly.