What should be the frequency of the incoming...

Question 1 / 205eccefa4bacbc34ba4d4818a

Question 1 of 205eccefa4bacbc34ba4d4818a

What should be the frequency of the incoming machine when paralleling two AC generators immediately prior to closing its breaker?

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Question 1 of 20

5eccefa4bacbc34ba4d4818a

What should be the frequency of the incoming machine when paralleling two AC generators immediately prior to closing its breaker?

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🔍 Key Concepts

• Synchronous speed and frequency relationship when connecting AC generators in parallel • Effects of large frequency differences on power flow and mechanical stress • Why operators prefer an incoming generator to "creep" in one direction on a synchroscope before closing the breaker

💭 Think About

• Before closing the breaker, do you want the incoming generator to be running noticeably faster, noticeably slower, or just a little different from the bus so you can control the point of synchronization? • If the incoming machine’s frequency is too high or too low compared to the bus, what happens to torque and power flow the instant the breaker closes? • On a synchroscope, do operators usually prefer the pointer to approach the in-phase mark slowly or to be stationary, and in which direction should it be moving just before closing?

✅ Before You Answer

• Make sure you understand that large frequency differences at closing can severely stress the generator and prime mover. • Think about normal shipboard paralleling procedure: do engineers aim for a slow, controlled "roll" of the synchroscope, or a rapid swing? • Verify which is desirable: the incoming machine frequency being slightly higher, slightly lower, or exactly equal just before you close the breaker.

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Question 1 of 20

What should be the frequency of the incoming machine when paralleling two AC generators immediately prior to closing its breaker?

at least 5 Hz higher than the bus frequency

exactly equal to the bus frequency

slightly greater than the bus frequency

slightly less than the bus frequency

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Question 1 / 205eccefa4bacbc34ba4d4818a

Question 1 of 205eccefa4bacbc34ba4d4818a

What should be the frequency of the incoming machine when paralleling two AC generators immediately prior to closing its breaker?

Back

Question 1 of 20

5eccefa4bacbc34ba4d4818a

What should be the frequency of the incoming machine when paralleling two AC generators immediately prior to closing its breaker?

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?

Quick actions

— No credit card needed