What role does a protector tube play in lightning protection?

The protector tube plays a vital role in lightning protection systems by mounting lightning arrestors. Lightning arrestors are devices designed to protect electrical systems from the high voltage surges caused by lightning strikes. The protector tube ensures that these devices are securely positioned and properly insulated from the surrounding environment while allowing them to function effectively in diverting and grounding the surge energy safely.

In this context, the correct answer emphasizes the importance of the structural support provided by the protector tube, which is essential for the operational integrity of the lightning protection mechanism. By securely mounting the lightning arresters, the protector tube helps ensure that the arrestors can effectively intercept and redirect surge currents during a lightning event, protecting the electrical systems from potential damage.

The other options do not accurately describe the primary function of the protector tube, as it is not involved in connecting power lines, reducing surge voltage directly, or simply providing insulation without the specific role of supporting lightning arrestors.