Re-synchronization with the Interconnection is ideally performed at which type of location?

• A. Substation with a synchroscope
• B. Generating plant with an auto-synchronization relay
• C. Substation with auto re-closing relays
• D. Substation with an auto-synchronization relay

Answer: (A)

The ideal location for re-synchronization with the Interconnection is at a substation that is equipped with a synchroscope. A synchroscope is a device that indicates the phase relationship between two electrical systems, which is crucial for ensuring that the voltage, frequency, and phase angle are closely matched before re-connecting the systems. It helps operators safely and effectively synchronize the frequency and phase of the generation source with the electric grid.

When re-synchronization occurs, particularly in situations like system disturbances or outages, ensuring a precise alignment of these parameters is essential to avoid damage to equipment and to maintain reliability and stability in the electrical system. The synchroscope provides visual feedback that aids operators in determining the optimal moment for synchronization, minimizing risks associated with mismatched electrical conditions.

While other options may refer to different technologies that support system reliability, they do not provide the same level of specialized monitoring and precise operational insight that a synchroscope does during the re-synchronization process.