Symbols Transformer
In addition to the various power transfonners, two special-purpose transfonners are used with e lectric machinery and power systems. TIle first of these special transformers is a device specially designed to sample a high voltage and produce a low secondary voltage directly proportional to it.
Such a transfonner is called a potential transfonner. A power transformer also produces a secondary voltage directly proportional to its primary voltage; the difference between a potential transfonner and a power transfonne r is that the potential transformer is designed to handle only a very small current. The second type of special transfonner is a device designed to provide a secondary current much smaller than but directly proportional to its primary current.
Electric Machinery Formula
An ideal transformer is a lossless device with an input winding and an output winding. The relationships between the input voltage and the output voltage, and betwccn the input curre nt and the output current.
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