In restoring power after a system collapse, what crucial step ensures stability before load restoration?

• A. Isolate low-demand areas
• B. Only restore firm service
• C. Maintain adequate reactive power support
• D. Close all lines in the area

Answer: (C)

Maintaining adequate reactive power support is a crucial step in ensuring stability before restoring loads after a system collapse. Reactive power is essential for voltage control in the power system. When power is restored, it is important to ensure that the voltage levels remain within acceptable limits, as this is vital for the health of the electrical equipment and the overall reliability of the power grid.

By having sufficient reactive power available, the system can better manage fluctuations in voltage caused by changes in load or system conditions. This stability is particularly important as different areas of the grid may experience varying load demands as power is restored. Ensuring robust reactive power support helps to prevent issues such as voltage collapse or oscillations that could lead to further instability or another system failure.

In contrast, while isolating low-demand areas, restoring only firm service, or closing all lines might seem relevant steps in the restoration process, they do not prioritize the immediate need for voltage stability that is critical during the initial phases of recovery from a collapse. Proper reactive power management ultimately lays the foundation for safe and effective load restoration, making it the key step in this scenario.