In preparations to synchronize two islands with differing frequencies, what action should be taken?

• A. Shed load in Island "B"
• B. Shed load in Island "A"
• C. Disable the Synch Check Relay
• D. Increase generation in Island "B"

Answer: (B)

When preparing to synchronize two islands with differing frequencies, shedding load in Island "A" is a crucial action because it helps balance the system frequencies before synchronization occurs. If Island "A" has a higher frequency compared to Island "B," reducing the load will decrease the demand on the generation in Island "A," thereby allowing it to be more readily adjusted to match the frequency of Island "B." This load shedding is essential for achieving a stable frequency match that is necessary for successful synchronization.

If the frequencies of the two islands are significantly mismatched, attempting to synchronize without balancing the frequency through load management could lead to system instability, damaging equipment, or failing to synchronize properly. Shedding load in this context ensures that the frequency and phase angle differences between the two systems are minimized, promoting a safer and more effective synchronization process.

Increasing generation or disabling the Synch Check Relay would not address the immediate issue of frequency mismatch, and shedding load in Island "B" could exacerbate the imbalance rather than resolve it.