Transformer selection begins with the electrical values that define the connected system. Reviewing these values in the correct order helps identify a suitable transformer range. The power transformer should be reviewed together with the stated application and order requirements.
Primary voltage must correspond with the incoming supply. Secondary voltage must meet the requirements of the downstream distribution circuit or electrical equipment. Both values should be checked against the actual network configuration. The power transformer can be specified according to the project requirements.
Rated capacity is expressed in kVA and should cover the apparent-power demand of the connected loads. The calculation should include the load pattern, power factor, starting current, temporary peaks, and planned growth. Selection of the power transformer should reflect the operating conditions and installation plan.
Frequency must match the transformer design. Voltage, winding turns, frequency, and core flux have a direct relationship, so an incorrect frequency can create abnormal magnetic conditions. The power transformer can be confirmed with the required dimensions and application details.
Impedance influences voltage drop under load and the prospective short-circuit current. This value must coordinate with the system calculation and protective devices.
After these electrical values are established, the insulation structure, cooling method, enclosure, connections, monitoring, installation clearance, and maintenance access can be selected.