As shown in figure "B" of the illustration,...

Question 1 / 205eccefa3bacbc34ba4d47f42

Question 1 of 205eccefa3bacbc34ba4d47f42

As shown in figure "B" of the illustration, what is the operating principle of the current transformer illustrated? See illustration EL-0132.

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Question 1 of 20

5eccefa3bacbc34ba4d47f42

As shown in figure "B" of the illustration, what is the operating principle of the current transformer illustrated? See illustration EL-0132.

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🔍 Key Concepts

• Ring-type current transformer surrounding all three phase conductors together, not each phase separately • For a three‑phase, three‑wire motor with no ground fault, how the three line currents relate vectorially (their phasor sum) when the load is normal and balanced • What changes in the sum of currents when some current leaves the three conductors through a ground fault path

💭 Think About

• Look at figure B and notice that all three phase leads pass through the same magnetic core. If the load is healthy, what is the algebraic (vector) sum of the three phase currents inside that core? • If a ground fault occurs on the motor, part of the return current flows through the equipment grounding path instead of back through the three phase conductors. How does that affect the net current passing through the CT window? • Which answer choice correctly describes the condition (ground fault or no ground fault) AND the state of the three line currents (balanced or unbalanced) that makes the CT output go to zero?

✅ Before You Answer

• Verify that when there is no ground fault on a balanced three‑phase load, the instantaneous sum of the three phase currents is zero, so the CT sees no net magnetizing ampere‑turns. • Confirm that a ground fault causes a residual (unbalanced) current that does not cancel in the CT, producing an output that operates the ground‑fault relay. • Match the correct option by asking: under normal, fault‑free conditions, are the three phase currents expected to be balanced or unbalanced, and should the CT output then be zero or non‑zero?

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Question 1 of 20

As shown in figure "B" of the illustration, what is the operating principle of the current transformer illustrated? See illustration EL-0132.

the current transformer output current is zero with no ground fault due to balanced individual line currents

the current transformer current is zero with no ground fault due to unbalanced individual line currents

the current transformer output current is zero with a ground fault due to balanced individual line currents

the current transformer current is zero with a ground fault due to unbalanced individual line currents

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Question 1 / 205eccefa3bacbc34ba4d47f42

Question 1 of 205eccefa3bacbc34ba4d47f42

As shown in figure "B" of the illustration, what is the operating principle of the current transformer illustrated? See illustration EL-0132.

Back

Question 1 of 20

5eccefa3bacbc34ba4d47f42

As shown in figure "B" of the illustration, what is the operating principle of the current transformer illustrated? See illustration EL-0132.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 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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— No credit card needed