Which method is NOT a verification method used by Transmission Operators for the System Restoration Plan?

The method that is not recognized as a verification method used by Transmission Operators for the System Restoration Plan is through contingency analysis. While contingency analysis is an important tool in power system operations and plays a role in assessing the resilience and stability of the grid under various scenarios, it is primarily focused on identifying potential problems that could arise from specific contingencies, rather than a direct method for verifying the effectiveness or completeness of a System Restoration Plan.

On the other hand, simulation exercises, functional drills, and walkthrough reviews are all methods specifically designed to test and validate the procedures outlined in the System Restoration Plan.

Simulation exercises involve creating realistic scenarios that the operators might face during an actual system restoration, allowing them to practice and refine their skills in a controlled environment. Functional drills typically engage the operators in practical exercises that mimic real-life situations to assess their readiness and response to system failures. Walkthrough reviews allow for a systematic examination of the restoration plan by discussing each step with stakeholders to ensure clarity and completeness.

These verification methods are critical for ensuring that Transmission Operators are well-prepared to effectively restore the system following an outage or disturbance.