In preparation for eventual paralleling of...

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Question 1 of 205eccefa4bacbc34ba4d481ba

In preparation for eventual paralleling of generators, if the condition of the electric plant is as shown in graph "A", what will be the status of the synchronizing lamps as shown in circuit "C" of the illustration? See illustration EL-0002.

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🔍 Key Concepts

• Phase angle difference between the bus and the incoming generator as shown in graph "A" • How synchronizing lamps behave when voltage, phase sequence, and frequency are nearly the same but there is a small speed (frequency) difference • The specific wiring of the two lamps in circuit "C" (which phases each lamp is connected between)

💭 Think About

• From graph "A", decide whether the incoming generator is running slightly faster or slightly slower than the bus and whether the phase angle error is increasing or decreasing with time • Think about what happens to the voltage difference across each lamp as the phase angle between the bus and incoming generator slowly changes • Compare the lamp connections in circuit "C": if both lamps see similar changing voltage differences, will they brighten and dim together, or will one be bright while the other is dark?

✅ Before You Answer

• Verify whether the incoming machine’s waveform is leading or lagging the bus in graph "A" • Confirm whether each lamp in circuit "C" is connected between corresponding phases (same phase to same phase) or between different phases (e.g., A‑phase of the bus to B‑phase of the incoming generator) • Make sure you are assuming correct phase rotation between bus and incoming generator; an incorrect phase rotation would cause a circulating pattern rather than simple bright/dark behavior

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