SECTION
BUCK-BOOST TRANSFORMERS
ACME ELECTRIC
•
MILWAUKEE, WI
•
800.334.5214
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acmetransformer.com
88
Why Use Buck-Boost Instead of
Another Type Transformer ?
Take a look at the advantages and disadvantages of
using a buck-boost transformer (autotransformer)
compared to a standard isolation transformer of the
proper size and voltage combination.
As you can see, the advantages are many, the
economies great. Buck-boost transformers are
readily available from the stock of your nearest Power
Distribution Products Distributor.
A typical buck-boost application is 120 volts in, 12
volts out for low voltage lighting or control circuitry. In
most applications, this low voltage transformer is field
connected as an autotransformer. (See question 2 for the
definition of an autotransformer). Buck-boost transformers
provide tremendous capabilities and flexibility in kVA
sizes and input/output voltage combinations.
Basically
you get 75 different transformers... all in one
convenient package.
Other buck-boost applications are, where (A) low supply
voltage exists because equipment is installed at the end
of a bus system; (B) the supply system is operating at or
over its design capacity; and (C) where overall consumer
demands may be so high the utility cuts back the supply
voltage to the consumer causing a “brownout.”
Where Are Buck-Boost
Transformers Used?
T211688
T111683
Proper Voltage Is Critical
With nearly two-thirds of all electrical loads being A.C. motor
loads, maintenance of the proper voltage to that motor is very
important. If the supply line voltage is not maintained, motor
winding current is increased causing reduced motor torque and
escalating motor temperature, all of which results in the rapid
loss of insulation life expectancy.
In addition to motor loads, the detrimental effects of low voltage
on both resistive heating loads and incandescent lighting
output is illustrated in the chart.
Anytime you have a lower than standard voltage, equipment
damage and failure can result.
Buck-boost transformers are an economical way to correct
this potentially very serious problem.
Anytime
a line voltage
change in the 5-20% range is required, a buck-boost
transformer should be considered as your first line of defense.
ADVANTAGES
More efficient
Smaller & lighter
5-10 times increase
in kVA
Versatile, many
applications
Lower cost
DISADVANTAGES
No circuit isolation
Cannot create a
neutral
Application voltages
and kVA don‘t match
the nameplate
voltages and kVA
