The study on the characteristics of operating limits of AC contactor during voltage sag

We studied the characteristics of operating limits during voltage sags of the AC contactor which are being used widely in industrial field. The characteristic analysis about voltage sags typically uses the magnitude and duration of the sag. However, the point-on-wave of sag initiation affects the contactor performance significantly. The point-on-wave is used on another test term. In this paper, to analyze the impact on voltage sags, the contactor is modeled mathematically. The simulation results depict the characteristics of the AC contactor about operating limits during voltage sags by the magnitude, duration and point-on-wave of sag in CBEMA curve.