Transformers are commonly used with American Rotary phase converters. In North America, most three phase utility service is nominal 208 volts, while single phase utility service is nominal 240 volts. A phase converter will change the phase (for example, from single phase 240V to three phase 240V), but a transformer may sometimes be necessary to change the voltage of the system (for example, 240V utility can be changed to 208V with a trainsformer).
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Dry-type distribution transformers are rated for 600 volts and below, and support a variety of general loads. Distribution transformers can be either ventilated, totally enclosed, or encapsulated (potted). Dry type distribution transformers can be used with American Rotary phase converters.
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The advantages of using a buck boost transformer with a rotary phase converter (or other application) over an equivalent standard isolation transformer are numerous: used in a variety of applications, inexpensive, smaller, lighter, more efficient, and offer 5-10 times increase in kVA. The disadvantages are that there is no circuit isolation, cannot create a neutral, KVA and voltages do not match what's on the nameplate kVA and voltages.
