Which of the following represents a significant concern during re-energizing of substations?

The potential for voltage spikes is a significant concern during the re-energizing of substations due to the dynamic and often unpredictable nature of electrical systems. When a substation is re-energized, it is reintroduced to the power network, which can lead to sudden changes in electrical conditions. These changes can cause transient voltage fluctuations, often referred to as voltage spikes, which can potentially damage equipment and affect the stability of the electrical grid.

Moreover, high voltage spikes can be harmful not only to the substation equipment but also to any connected devices and systems downstream, which may not be designed to handle such sudden changes in voltage. This is why engineers and operators must closely monitor and manage voltage levels during the re-energizing process to mitigate any risks associated with these spikes.

While equipment inspection procedures, environmental compliance regulations, and the safety of nearby personnel are important considerations during the operation of substations, they do not present the same immediate technical electrical risk associated with voltage spikes during re-energization. Therefore, identifying and managing the potential for voltage spikes is critical to ensuring both equipment protection and the overall reliability of the electrical system.