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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q536 - Electrical, Electronic, & Control Engineering
402. In figure «4» of the diagram in the illustration, the three-phase step-down power transformer has a turns ratio of five to one. If a three-phase 4160 volt supply is connected to terminals «A1-B1-C1», what voltage should develop across terminals «A2-B2-C2»
The transformer's 5:1 turns ratio reduces the 4160 volt three-phase supply voltage to 480 volts across the delta-connected secondary terminals (A2-B2-C2). This calculation accounts for the wye-connected primary and delta-connected secondary configurations.
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