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Terms
& Definitions:
Buck-Boost transformers are single phase, four winding
transformers designed for two purposes. The first purpose is as a low voltage isolation transformer for use on 12, 16, 24, 32,
or 48 colt circuits. When used as low voltage transformers,
Buck-Boost transformers have capacities of .050 kVA to 5.0 kVA.
Their second, and more important use, is as a
"Buck-Boost" transformer. Buck-Boost means that these
transformers are used to buck (lower) or boost (increase) line
voltage to match required load voltage.
Buck-Boost
transformers are used to correct consistently low or high
voltage conditions, where the voltage difference ranges from
approximately 5% to 27%. Variation of the input voltage is
passed through to the output side of the transformer in the same
percentage. This concept is important because the question is
frequently asked if Buck-Boost transformers will stabilize
variable voltages. They will not!
Buck-Boost
transformers are simple and straight forward to specify, size
and connect. Buck-Boost connections are achieved by
interconnecting the 8 copper lead wires supplied with each
transformer in accordance with the charts contained in this
section. In addition each transformer shipped from the factory
is equipped with a similar chart to assure ease of use at the
installations site.
Applications:
The
most common applications for these transformers are boosting 208
volt lines to 230 or 240 volts, and vice-versa. These
applications include both single and three phase lines and are
particularly common in HVAC applications for air conditioning
appliances.
Additionally,
Buck-Boost transformers are very well suited to motor loads,
boosting 240 to 277 for lighting loads and many applications
where nominal voltage is above or below 120 volts. Their use
should be considered where supply line voltage is found to be
consistently above or below desired nominal values of load
voltage.
Single
Phase Applications:
Single
phase applications require the purchase of one transformer.
Download charts on pages 53-55 for specifying and sizing single
phase applications.
Three
Phase Applications:
Three
phase applications require banking either 2 or 3 Buck-Boost
transformers. Download charts on pages 56-58 for specifying and
sizing three phase applications.
Pre-connected
Three Phase Applications:
Series
ODY Autotransformers provide an economical, factory pre-connected
installation for transforming three phase lines from 208 to 240,
or 240 to 208. This series banks 2 Buck-Boost transformers into
one assembly for mounting and one assembly for connecting.
Simply bring in three wires on the line side and take out three
wires on the load side. Download page 52 for additional
information.
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