What is BUCKBOOST TRANSFORMER and Operation of Buckboost
transformer?

Answer Posted / madhumitha

Buck-Boost transformers are small, single phase, dry type
distribution transformers designed and shipped as
insulating/isolating transformers. They have a dual voltage
primary and a dual voltage secondary. These transformers
can be connected for a wide range of voltage combinations.
The most common use is to buck (lower) or boost (raise) the
supply voltage a small amount, usually 5 to 27%. Buck-Boost
transformers are in compliance with NEC Article 210-9,
Exception 1 when field connected as an autotransformer.

The major advantages of Buck-boost transformers are their
low cost, compact size and light weight. They are also more
efficient and cost less than equivalent isolation
transformers. When connected as an autotransformer, they
can handle loads up to 20 times the nameplate rating. A
buck-boost transformer is the ideal solution for changing
line voltage by small amounts.

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