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Variable
Transformers, often generally
referred to as Variacs, Variac Auto
Transformers, Variable Auto
Transformers, Dimmer, Variation
Transformers, Voltage Regulator etc
are widely used when adjustable
voltages are required for quality
control testing, electronic
equipment burn-in, life-tests, low
voltage performance evaluation, D.C.
rectifier/regulator analysis or
other industrial and engineering
applications.
Variac transformers have many
industrial and laboratory
applications as basic components to
control voltage, current, power,
heat, speed, light, and
electromechanical force.
Bench Top Variacs are widely used in
Service Shops, Industrial & Academic
Laboratories, Engineering Design
Facilities, Manufacturing Operations
and Field Installation Teams.
Inherent portability makes these
units valuable in instances where
actual operational parameters need
to be ascertained.
RAVISTAT Variable Transformers are
rated 240 volts Input and 0-270Volts
output. Similarly, three 240-volt
units are ganged in a star
connection to result in a 470-volt
line-to-line three-phase assembly.
For 480-volt open delta
applications, two 240-volt units are
used in series in each of the two
legs of the open delta assembly. In
any of the above voltage
applications, higher current
requirements are met by paralleling
two or more units in the ganged
assembly.
In contrast to inefficient,
wattage-burning resistive-type
controllers such as rheostats,
RAVISTAT Variable Transformers have
an extremely low power loss and
efficiencies as high as 98%.
RAVISTAT Variable Transformers
deliver any desired voltage (within
the transformer rating) with
negligible variation in output
voltage from no-load to full-load
current. Individual regulation
curves for all types are shown in
the product section.
DISTORTIONLESS VOLTAGE CONTROL :
RAVISTAT Variable Transformers
produce an accurate transfer of
input wave to output circuit,
providing distortion less voltage
control (a requisite of many
sophisticated electronic
applications).
PLATED
COMMUTATOR SURFACE :
The commutator surface (track) of
each coil is specially plated with
precious silver metal and chemical
compound such as silver salt, giving
RAVISTAT commutators longer life,
increased resistance to corrosion
and the capacity to withstand
greater overloads (while maintaining
a constant contact voltage drop).
SIMPLE
INSTALLATION AND CONNECTION :
Mounting of RAVISTAT units is
convenient and easy. Most Series
units are designed with an
adjustable shaft to accommodate
either bench or panel mount
(adjustable to accommodate varying
panel thickness). Terminals are
easily accessible; screw, lug or
solder design. Connections deliver
increasing output voltage with
either clockwise or
counter-clockwise knob rotation.
Manually operated units have
standard dials graduated 0-100% or
0-270V (output voltage).
LONGER LIFE
WITH NEGLIGIBLE MAINTENANCE :
Precise design assembly of the brush
(at a constant pressure to a
smoothly finished and securely
bonded commutator surface) provides
excellent mechanical performance,
long life, and low-driving torque.
Brush replacement is seldom needed,
but it is easily performed. High
safety margins of voltage,
current-carrying capacity and
dielectric strength are why you can
expect longer life from RAVISTAT
Variable Transformers.
TEMPERATURE
& RATING :
The low loss of RAVISTAT Variable
Transformers allows operation at
full current rating @ ambient
temperatures up to 45 degrees C.
RUGGED
MECHANICAL CONSTRUCTION :
RAVISTAT Variable Transformers are
precision built to exacting
mechanical tolerances using the
finest materials available. Quality
assurance inspections are performed
to insure that the high designed-in
quality is maintained throughout the
manufacturing cycle. A RAVISTAT
Variable Transformer provides
accurate, reliable and lasting
voltage control for a broad variety
of applications.
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