When paralleling two alternators using three synchronizing lamps, the flickering of all three lamps becomes progressively slower and slower. What does this mean?
• Synchronizing lamps method for paralleling alternators • Relationship between lamp flicker rate and frequency difference • Difference between matching frequency and matching voltage when paralleling generators
• What does a fast flicker versus a slow flicker of the synchronizing lamps tell you about the difference between the incoming alternator frequency and the bus frequency? • If all three lamps are bright and dim at the same time (in step), what does that indicate about phase rotation and frequency? • Which of the choices deals with frequency, and which deal with voltage or phase sequence instead?
• Identify which options refer to frequency, which to voltage, and which to phase rotation/sequence • Recall: as the flickering becomes slower, the difference in frequency between the incoming machine and the bus is getting ______ • Verify that phase rotation errors usually show up as lamps not going bright/dark together, rather than simply flickering more slowly
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