An alternator switchboard has a synchroscope...

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Question 1 of 205eccefa4bacbc34ba4d481be

An alternator switchboard has a synchroscope and synchronizing lamps. If the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus?

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🔍 Key Concepts

• Three conditions for synchronizing alternators: voltage, frequency, and phase sequence • How dark and bright synchronizing lamps indicate phase relationship between incoming alternator and bus • Why closing the breaker at the moment of phase coincidence is critical to avoid large circulating currents

💭 Think About

• How do the synchronizing lamps behave when the incoming alternator is in phase with the bus versus slightly out of phase? • What does it mean if all lamps go dark at the same instant compared to when they get bright together? • Why is it important for the incoming alternator’s frequency to be slightly higher or lower than the bus before closing the breaker?

✅ Before You Answer

• Verify how a three-lamp synchronizing method (arranged across phases) indicates correct phase sequence • Confirm what lamp condition corresponds to zero phase difference between alternator and bus • Ensure that any use of a frequency meter is combined with the correct visual cue from the synchronizing lamps before closing the breaker

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