What is the purpose of unwinding the grounding cable on truck-mounted cable reels?

Unwinding the grounding cable on truck-mounted cable reels primarily serves to eliminate induction. Induction can occur when cables remain coiled or improperly positioned, which may lead to unintended electrical currents being generated or the potential for electromagnetic interference. By unwinding the grounding cable, the induction effects are minimized, ensuring that the cable functions effectively and safely in its grounding capacity.

This action aids in maintaining the integrity of the grounding system, which is critical for the safety and reliable operation of electrical equipment in a substation. The grounding cable’s purpose is to provide a path for fault currents and electrical surges, and effective unwinding allows it to perform this role without interference from any induction effects that could compromise safety or equipment performance.