Active Voltage
Conditioner
Ride-through Storage

Common cause of voltage sags

Voltage sag is generally caused by the failure of power grid, substation facilities or sudden large changes in load. In the process of long-distance transmission, there are many unpredictable situations, such as power system fault, lightning strike, large motor starts, capacitor switching and other events in the transmission and distribution system.



Natural cause
Extreme weather like lightning strikes, typhoon, hurricanes and storms cause a short circuit to the ground in the transmission line, activated the protective action, causing voltage sag around the fault point.

Power system cause
Starting of heavy machine and short circuit fault, etc.

Unpredictable accident
Traffic accident may damage the electric pole; Construction accidents like hoist machine contact the overhead line and excavation construction can destroy the underground electric cable; Animals’ invasion to the transmission line. All of these sudden and inevitable accidents may cause short circuit which lead to voltage sag.