One phase galvanic isolation transformer
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Most modern UPS systems do not include the internal transformers that were present in earlier designs. This evolution has increased efficiency while decreasing the weight, size, and raw materials consumption of UPS systems. In the new transformerless UPS designs, the transformers are optional and can be placed in the best location to achieve a required purpose. In older designs, transformers were typically installed in permanent positions where they provided no benefit, reduced system efficiency, or were not optimally located.
Every data center power system includes transformers. Isolation transformers have historically had a number of different roles in the power architecture of data centers, industries, automation..: