What would be the source current and...

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Question 1 of 2066636eed28f7522a1c51ddba

What would be the source current and transformer current as shown in figure "B" of the illustration, with the secondary tap connected as shown, if the supply voltage at the branch circuit breaker is 440 VAC and the unity power factor load current draw is 50 amps? Illustration EL-0083

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Question 1 of 20

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🔍 Key Concepts

• Autotransformer operation with a single winding and a tapped section (common winding vs series winding). • Relationship for an ideal transformer/autotransformer: input VA ≈ output VA (at unity power factor). • How tap percentage affects secondary voltage when the full winding is across 440 VAC.

💭 Think About

• From the figure, decide what voltage the load actually sees when it is connected to the 75% tap on a 440 VAC winding. How does that compare to the full source voltage? • Use the load voltage and the given 50 A load current to find the load kVA, then relate that to the source side to determine the source current. • Think about current flow in the common winding of an autotransformer: is that winding carrying the full load current, the full source current, or the difference between the two?

✅ Before You Answer

• Compute the load voltage correctly from the 75% tap (percentage of 440 VAC). • Confirm the apparent power on the load side and match it to the source side (unity power factor ⇒ kW ≈ kVA). • Determine whether the labeled XFMR current is the current in the tapped section only, and whether it equals the load current, source current, or the difference between them.

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