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

Question 1 / 2066636eed28f7522a1c51d549

Question 1 of 2066636eed28f7522a1c51d549

In figure "2" of the diagram shown in the illustration, the three-phase step-down power transformer has a turns ratio of four to one. If a three-phase 480 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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🔍 Key Concepts

• Turns ratio of a transformer and how it relates primary voltage to secondary voltage on a per-phase basis • Difference between line voltage and phase voltage in a three-phase wye versus delta connection • How the specific winding connections shown in figure "2" (primary and secondary) affect the relationship between applied 480 V and the voltage at A2-B2-C2

💭 Think About

• First, decide whether the 480 V given is a line-to-line voltage or a line-to-neutral voltage on the primary, and how that appears in a wye system. • Look at the figure and determine whether the secondary (A2-B2-C2) is connected in wye or delta. How does that choice change the relationship between phase voltage and line voltage? • After finding the secondary phase voltage using the 4:1 turns ratio, convert that phase voltage to the line-to-line voltage that actually appears between A2-B2-C2.

✅ Before You Answer

• Verify from the drawing whether the primary is wye-connected with a neutral point N1, and what that implies for primary phase voltage when the line voltage is 480 V. • Verify from the drawing whether the secondary A2-B2-C2 windings are connected in wye or delta. • Compute: primary phase voltage → divide by turns ratio (4:1) → secondary phase voltage → then convert to secondary line voltage and match it to one of the choices.

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Question 1 / 2066636eed28f7522a1c51d549

Question 1 of 2066636eed28f7522a1c51d549

Back

Question 1 of 20

66636eed28f7522a1c51d549

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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