When paralleling two AC generators, what...

Question 1 / 205eccefa4bacbc34ba4d4818b

Question 1 of 205eccefa4bacbc34ba4d4818b

When paralleling two AC generators, what should be the frequency of the machine coming on-line, immediately prior to closing its breaker?

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Question 1 of 20

5eccefa4bacbc34ba4d4818b

When paralleling two AC generators, what should be the frequency of the machine coming on-line, immediately prior to closing its breaker?

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🔍 Key Concepts

• Paralleling AC generators and matching conditions (voltage, frequency, phase) • Effect of slight frequency difference between the incoming machine and the bus on power flow direction • What happens if the incoming generator frequency is higher or lower than the bus at the instant of closing the breaker

💭 Think About

• Think about which way real power will initially flow if the incoming generator’s speed/frequency is slightly higher or lower than the bus when you close the breaker. • Consider what condition you want at the instant of closing the breaker: do you want the incoming machine to immediately pick up load, lag behind, or bang into the system? • How would ‘much greater’ or ‘much less’ frequency affect mechanical and electrical stress when synchronizing?

✅ Before You Answer

• Make sure you understand that bus frequency is the frequency of the already-running online generators. • Recall that for proper synchronizing you generally want same voltage, same frequency, and phase alignment just before closing the breaker. • Eliminate any options that would clearly cause a large power surge or mechanical shock when the breaker is closed.

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Question 1 of 20

When paralleling two AC generators, what should be the frequency of the machine coming on-line, immediately prior to closing its breaker?

slightly less than the oncoming generator frequency

the same as the bus frequency

slightly greater than the bus frequency

much greater than the bus frequency

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Question 1 / 205eccefa4bacbc34ba4d4818b

Question 1 of 205eccefa4bacbc34ba4d4818b

When paralleling two AC generators, what should be the frequency of the machine coming on-line, immediately prior to closing its breaker?

Back

Question 1 of 20

5eccefa4bacbc34ba4d4818b

When paralleling two AC generators, what should be the frequency of the machine coming on-line, 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