In considering the waveforms as shown in...

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Question 1 of 205eccefa4bacbc34ba4d48190

In considering the waveforms as shown in figure "A" of the illustration, what would be the position of the synchroscope pointer as shown in figure "B" of the illustration at the instant the waves are in synchronism? See illustration EL-0053.

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🔍 Key Concepts

• Synchroscope operation – what the pointer indicates about phase relationship between bus and incoming machine voltages • Phase angle / synchronism – what it means when two AC waveforms are in phase versus leading or lagging • Safe paralleling condition – what condition you want on phase angle at the instant of closing the breaker

💭 Think About

• Look at figure A and identify the exact point marked "waves in synchronism". At that instant, what is the phase difference (error angle) between the bus and incoming machine? • Now think about how a synchroscope translates phase difference into pointer position. When the phase angle is zero (no error), where does the pointer sit on the dial? • When the incoming machine is slightly ahead or behind the bus, how would the pointer move relative to that reference position?

✅ Before You Answer

• Be clear on what zero phase angle means for the two sine waves in figure A (crests and zero crossings line up). • Recall which pointer position on a standard shipboard synchroscope represents the ideal instant to close the breaker. • Verify that the choice you pick corresponds to the position used in practice when two generators are in phase and at the same frequency.

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