Ship's power is generated as 3-phase and is...

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Question 1 of 20bxXG1HkrQQ4JJ2GFu0nq

Ship's power is generated as 3-phase and is ungrounded. On a delta-wound transformer with 120 VAC line-to-line secondary, what is the voltmeter reading from line to ground:

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Question 1 of 20

bxXG1HkrQQ4JJ2GFu0nq

Ship's power is generated as 3-phase and is ungrounded. On a delta-wound transformer with 120 VAC line-to-line secondary, what is the voltmeter reading from line to ground:

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🔍 Key Concepts

• Ungrounded 3‑phase delta system behavior relative to ground • Relationship between line-to-line voltage and the effective line-to-ground voltage in a balanced ungrounded system • Effect of a single line-to-ground fault on measured voltages in the faulted and unfaulted phases

💭 Think About

• Think about what happens to the three phase voltages in a delta, ungrounded system when there is NO fault. How does the system "float" with respect to ground? • If one phase becomes solidly grounded, what will a voltmeter read from that phase to ground? Then, what will a voltmeter read from the other (unfaulted) phases to ground? • Compare each answer choice to a specific physical condition: (1) normal, no fault; (2) that phase faulted to ground; (3) a different phase faulted to ground. Which choices correctly match those conditions?

✅ Before You Answer

• Verify how to compute the approximate phase-to-ground voltage in a balanced ungrounded system from a known line-to-line voltage (hint: involves (\sqrt{3})). • Check that you understand that a faulted-to-ground phase in an ungrounded system will be at essentially 0 V to ground, while the other phases will shift in voltage relative to ground. • Confirm whether each of the options A, B, and C can occur under some realistic operating condition on an ungrounded delta system before deciding if D) Any of the above is reasonable.

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Question 1 of 20bxXG1HkrQQ4JJ2GFu0nq

Ship's power is generated as 3-phase and is ungrounded. On a delta-wound transformer with 120 VAC line-to-line secondary, what is the voltmeter reading from line to ground:

Back

Question 1 of 20

bxXG1HkrQQ4JJ2GFu0nq

Ship's power is generated as 3-phase and is ungrounded. On a delta-wound transformer with 120 VAC line-to-line secondary, what is the voltmeter reading from line to ground:

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

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