How does a buck-boost transformer differ from an insulating transformer?

A buck-boost transformer IS an insulating type transformer when it is shipped from the factory. When it is connected at the job site, a lead wire on the primary is connected to a lead wire on the secondary – thereby changing the transformer’s electrical characteristics to those of an autotransformer.

The primary and secondary windings are no longer “insulated” and secondary windings are no longer “insulated” and its kVA capacity is greatly increased. Refer to figures 1, 2 and 3.

Figure 1Figure 2Figure 3

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