Transcript Slide 1

Preventing Voltage Sags and
Interruptions
# 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.
# Customers level protection and
carefulness:
- UPS (Uninterruptible Power Supply)
- Energy storage device installation
(SMES, Flywheel, super-capacitor,
battery, etc.)
- Voltage sag mitigation
- Fluctuations minimization
# Control and fault clearing issues:
- Primary controls
- Automatic Circuit Recloser
-Auxiliary controls
- Sectionalizer
- Fuse
- Optimal reclosing technique
Typical System
HV SYSTEM
FEEDER #1
FEEDER #2
FUSE
SECTIONALIZER
RECLOSER