What conditions must be met before two AC...

Question 1 / 270708XYjBHTJI7ZNuNmZQaf6

Question 1 of 270708XYjBHTJI7ZNuNmZQaf6

What conditions must be met before two AC generators can be operated in parallel?

Question 1 of 27070

What conditions must be met before two AC generators can be operated in parallel?

🔍 Key Concepts

• Synchronizing AC generators before closing the breaker • Relationship between voltage, frequency, and phase when operating in parallel • Why phase rotation and phase angle matter in three-phase systems

💭 Think About

• If two generators are not synchronized, what will happen to the circulating currents and mechanical stress when the breaker is closed? • Is it enough that the meters show the same voltage and frequency, or do you also need to think about the timing and order of the phases? • In a three‑phase system, what does it mean if phase rotation is different between two machines?

✅ Before You Answer

• Check what must match for safe paralleling: voltage magnitude, frequency, and waveform relationship. • Verify whether phase sequence (rotation) must be the same for three‑phase generators. • Confirm if the instantaneous phase angle (relative phase position) between generators matters, not just the average frequency.

Question 1 of 27070

What conditions must be met before two AC generators can be operated in parallel?

Output voltages must be equal, frequencies must match

Phase rotation, and relative phase positions must match

A & B

None of the above