01-09-2012, 11:40 AM
CONSTANT VOLTAGE TRANSFORMER
CONSTANT VOLTAGE.pptx (Size: 1.29 MB / Downloads: 75)
Introduction
Constant voltage transformer (CVT) is an equipment that has been in use since long time to protect sensitive computing and electronic devices from surges, sags and brownouts in the mains supply. CVT is also suitable for protecting sensitive loads against direct lightning strikes on power lines. It is also known as ferroresonant transformer.
HISTORY
The ferroresonant transformer or constant voltage transformer has a very long history having been invented in 1938 by Joseph Sola and continuing to sell tens of thousands of units per year.
The ferro of today has had some minor improvements but remains fundamentally unchanged from the original design.
Well known for its longevity, some CVTs are found still in service after more than 40 years.
What Is voltage regulator?
an electrical regulator designed to automatically maintain a constant voltage level
a voltage regulator may be a simple "feed-forward" design or may include negative feedback control loops
uses an electromechanical mechanism
depending on the design, it may be used to regulate one or more AC or DC voltages
Advantages
unique design
provides good isolation of load equipment from line noise and surges
output voltage regulation is smooth
distortion is minimized
very durable with some manufacturers offering warranties in excess of 10 years
its design can limit the amount of current to the load
protect loads from high currents