A 480/120 VAC step-down control transformer...

Question 1 / 205eccefa4bacbc34ba4d48528

Question 1 of 205eccefa4bacbc34ba4d48528

A 480/120 VAC step-down control transformer is configured as shown in figure "E" of the illustration. When 480 VAC is applied to the primary winding (across H1 and H2), an output of 89 VAC is produced across the secondary winding (across X1 and X2). What fault condition is indicated? Illustration EL-0123

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🔍 Key Concepts

• Transformer turns ratio between a 480 VAC primary and 120 VAC secondary • How shorted turns vs open windings affect secondary voltage and current • Difference between a complete open circuit (primary or secondary open) and a partially shorted winding

💭 Think About

• First, calculate the normal turns ratio for a 480/120 transformer and what secondary voltage you should read with 480 VAC applied and no fault present. • Then, for each fault choice, ask: would this give me zero volts, normal volts, or reduced/increased volts on the secondary? • Think about what happens to the effective number of turns on each winding if some turns are shorted together vs if the winding is open.

✅ Before You Answer

• Verify what the expected secondary voltage is for a healthy 480/120 transformer. • For an open primary or open secondary, verify whether any voltage can be induced or measured across X1–X2. • For shorted turns, verify whether the effective turns on that winding go up or down, and how that changes the X1–X2 voltage with 480 VAC on H1–H2.

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Question 1 of 20

A few shorted turns in the secondary winding

An open primary winding (across H1 and H2)

An open secondary winding (across X1 and X2)

A few shorted turns in the primary winding

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Question 1 / 205eccefa4bacbc34ba4d48528

Question 1 of 205eccefa4bacbc34ba4d48528

Back

Question 1 of 20

5eccefa4bacbc34ba4d48528

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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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