What Is a Three-Phase Transformer and Where Are Three-Phase Transformers Used?Johnson Electric Coil Company
As the name suggests, three-phase transformers are designed to transform the line or input voltage supplied by a three-phase source to the voltage required by a three-phase load on the output side. Where step down transformers deliver a lower secondary or output voltage than the primary or input voltage, step up transformers do the opposite. In other cases, where the available line voltage matches that of a machine or system, a transformer is often needed to isolate and therefore protect the equipment under load or other downstream components in the circuit from various disturbances and electrical noise on the line side that might otherwise compromise performance or shorten their useful life. A three-phase transformer can also be designed to deliver a given output voltage across a range of input voltages to accommodate variations in line voltage, step-up or step-down, from one location to another. A custom-designed three-phase transformer can be configured to supply a combination of relatively balanced single-phase loads or a low-power single-phase component in addition to its main three-phase load as well.
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