ARE Project Management (PjM) Practice Exam

What is the maximum amount of under-frequency relayed load that can be used as part of the total dynamic reserve?

1. 142.5 MW

2. 160 MW

3. 150 MW

4. 147.5 MW

The correct answer is: 147.5 MW

The maximum amount of under-frequency relayed load that can be used as part of the total dynamic reserve is critical for maintaining system stability during instances of supply-demand imbalances. In the context of power systems, under-frequency relays are protective devices that disconnect loads when the frequency drops below a certain threshold, helping to balance supply and demand by reducing the load on the system. The specified correct answer indicates that the maximum allowable contribution from under-frequency relayed loads to the total dynamic reserve is 147.5 MW. This value is determined based on operational guidelines and standards that govern how these loads should be integrated into reserve calculations. It takes into account factors such as system reliability, safety protocols, and the need for effective response to frequency events. Understanding this value is critical for project managers and engineers involved in the planning and operation of electrical grids. Ensuring that the correct amount of dynamic reserve, including contributions from under-frequency relayed loads, is available at all times is essential for operational security and the prevention of widespread outages.