If a second generator is brought online, and its frequency is set slightly higher than the running generator's, what is the intended outcome?

If a second generator is brought online, and its frequency is set slightly higher than the running generator's, what is the intended outcome?

• A. Synchronization
• B. Isolation
• C. Load shedding
• D. Voltage boost

Answer: (A)

Synchronizing parallel generators is about making two machines act as one source by matching frequency, voltage, and phase so they can share load safely. When you bring a second generator online and set its speed just a bit higher than the running unit, a temporary frequency difference exists that causes electrical and mechanical torques to drive the new machine toward the same speed as the bus. The governors and automatic synchronizing controls then lock the second generator into step with the first, aligning phase and voltage so both machines operate in parallel. This approach is not about isolating the units, shedding load, or boosting voltage. Isolation would remove a generator from service, load shedding changes the amount of load rather than how generators cooperate, and voltage boosting involves adjusting voltage levels, not the intended process of bringing a generator online.

Synchronizing parallel generators is about making two machines act as one source by matching frequency, voltage, and phase so they can share load safely. When you bring a second generator online and set its speed just a bit higher than the running unit, a temporary frequency difference exists that causes electrical and mechanical torques to drive the new machine toward the same speed as the bus. The governors and automatic synchronizing controls then lock the second generator into step with the first, aligning phase and voltage so both machines operate in parallel.

This approach is not about isolating the units, shedding load, or boosting voltage. Isolation would remove a generator from service, load shedding changes the amount of load rather than how generators cooperate, and voltage boosting involves adjusting voltage levels, not the intended process of bringing a generator online.