Preventing Voltage Sags and Interruptions

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Preventing Voltage Sags and Interruptions
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• 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.

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

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• Control and fault clearing issues
• - Primary controls
• Automatic Circuit Recloser
• -Auxiliary controls
• Sectionalizer
• Fuse
• - Optimal reclosing technique

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Typical System