What does coiling ground cables do during a fault current event?

Coiling ground cables during a fault current event is primarily done to minimize whipping. When a fault occurs, electrical currents can cause ground cables to behave dynamically due to the magnetic forces generated by the fault current. If these cables are not properly managed, they can whip or flail, which presents risks to personnel and equipment. By coiling the ground cables, the chances of whipping are reduced, helping to ensure safety and stability during such an event. This proactive measure is crucial in managing the physical effects that can arise during fault conditions, thereby enhancing safety measures in the substation environment.

The other options do not accurately describe the primary purpose of coiling ground cables in this context. Enhancing conductivity or improving visibility aren't relevant to the dynamics at play during a fault current event. Similarly, coiling does not increase the resistance of the ground cables; rather, it is about controlling the physical behavior of the cables.