In figure "2" of the diagram shown in the...

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Question 1 of 2066636eed28f7522a1c51d541

In figure "2" of the diagram shown in the illustration, the three-phase power transformer has a step- down turns ratio of four to one. If a three-phase 440 volt supply is connected to terminals "A1-B1- C1", what voltage should develop across terminals "A2-B2-C2"? Illustration EL-0084

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Question 1 of 20

66636eed28f7522a1c51d541

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🔍 Key Concepts

• Transformer turns ratio and how it affects primary vs secondary phase voltage • Difference between line-to-line voltage and phase (line-to-neutral) voltage in wye and delta connections • How the specific winding connections in figure 2 (primary and secondary) change the relationship between the 440 V supply and the A2-B2-C2 voltage

💭 Think About

• First, decide whether the 440 V applied to A1-B1-C1 is a line-to-line or phase voltage based on how T1, T2, and T3 primaries are connected in figure 2. What does that tell you about the primary phase voltage? • Apply the 4:1 step-down turns ratio to convert the primary phase voltage to the secondary phase voltage. Then, from the way the secondaries are connected, convert that phase voltage to the secondary line voltage across A2-B2-C2. • Compare your calculated secondary line voltage with the answer choices. Which option is closest to the theoretical value you get?

✅ Before You Answer

• Identify correctly whether each side (primary and secondary) is wye or delta connected by tracing how the ends of the windings are tied together in figure 2. • Make sure you apply the turns ratio to phase voltages, not directly to the line voltage, unless the connection type makes them the same. • After finding the secondary phase voltage, carefully convert to the secondary line-to-line voltage using the correct factor (either 1 or √3, depending on the connection).

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