AVR (Automatic Voltage Regulator/Stabilizer) (650VA, 1200VA & as per requirement)
AVR
The
automatic voltage regulator or AVR, as the name implies, is a device
intended to regulate voltage automatically: that is to take a varying
voltage level and turn it into a constant voltage level.
The Need for Automatic Voltage Regulation:
Many factors contribute to the need for automatic voltage
regulation. However, the ultimate reason for using voltage regulation
is financial – to avoid the costs associated with equipment damage and
downtime caused by poor voltage levels.
This section discusses why voltage levels fluctuate, what can be expected, what type of problems may be encountered and more...
Utility Voltage Levels:
Anyone
receiving power from an electric utility will see the nominal incoming
voltage level (e.g. 120V) change over the course of a day to a small or
large degree. There are many factors contributing to the amount of
voltage level fluctuation observed including: 1) location on the local
distribution line, 2) proximity to large electricity consumers, 3)
proximity to utility voltage regulating equipment, 4) seasonal
variations in overall system voltage levels, 5) load factor on local
transmission and distribution system, etc.
Voltage
levels are often highest during the nighttime hours and weekends when
the electrical demand is minimal and are lowest weekday afternoons when
the demand for electricity peaks. Most electric utilities in the U.S.
try to maintain the voltage level within plus or minus 5% of the nominal
voltage level (e.g. 480V +/-5%), however for short periods the voltage
level may be as much as 6% high or 13% low (according to ANSI Standard
C84.1). On the nominal 480V system, this would translate to incoming
voltage ranging from 509V (480V +6%) to 420V (480V-13%). Larger
deviations from nominal voltage are also permissible on a momentary
basis or may simply be unavoidable.
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