VOLTAGE AND SAG
14TH APRIL 2019
• Our presentation is based on voltage and sag interruptions.
• A voltage sag can be defined as a “sudden reduction of voltage from its nominal range for a period of
millisecond to few seconds, followed by a recovery to normal rated voltage”. Short Interruption, on the
other hand, is termed as complete outage of the power for a very small period of time.
• Shortages of power and disruptions cause harm not only to humans but also to machines that are
responsible for producing the vital commodity.
• The study describes and defines the difference between Voltage Sag and Short interruptions.
• The study approach is from the perspective of a person knowledgeable with voltage sag and short
• They are two factors that lead to a decrease in the efficient and electrical equipment to a significant extent.
THE FERRO RESONANT TRANSFORMER
The Ferro Resonant Transformer helps in regulating or reducing the
effect of short interruptions and voltage sags. The transformer acts as a
circuit breaker so that the impact of brief interruptions and voltage sag is
not profoundly felt and does not damage any equipment. The transformer
has a primary winding through which the line enters, compensating and a
secondary winding; then it is neutralized at the neutralized winding.
NORMAL AND SATURATION ZONES
• Ferro resonant transformers, due to their characteristics, are extremely
useful in responding and limiting the short circuit current. When the load
current exceeds about 150% of the rated current the unit goes in to “pulled
out mode” and output voltage decreases significantly thus saving the
connected load from any inrush current.
UNINTERRUPTABLE POWER SUPPLY
Uninterruptable power supply plays a very important role especially in data centers for
providing clean and harmonics free power supply to the critical load , thereby providing a
very strong backup for critical loads. UPS normally use batteries for storage of energy and
for providing backup in the event of power failure or voltage sag and interruptions. Most
commonly used UPSs in Manufacturing and Processing Plants are “Double Conversion
Online UPS” in which input power is ...
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