1. Preventing Voltage Sags and Interruptions

2. # Equipment supplier awareness: # Customers level protection: # Utility level protection: - Sag magnitude and duration control. -Equipment supplier should provide the minimum voltage sag ride-through capability curves to the customers. - Customers should understand the curves as well as characteristics of the equipment.

3. # Customers level protection and carefulness: -UPS (Uninterruptible Power Supply) -Energy storage device installation (SMES, Flywheel, super-capacitor, battery, etc.) -Voltage sag mitigation - Fluctuations minimization

4. # Control and fault clearing issues: - Primary controls -Automatic Circuit Recloser -Auxiliary controls -Sectionalizer -Fuse - Optimal reclosing technique

5. Typical System