The process begins with the use of portable partial discharge testing equipment, which is brought on-site to evaluate specific components such as transformers, switchgear, or high-voltage cables. Technicians temporarily connect sensors or couplers to the equipment to capture high-frequency signals emitted by partial discharges. These signals are then analyzed using advanced software to determine the type, location, and severity of any insulation defects. The entire procedure is efficient, safe, and provides immediate insights into the health of critical infrastructure.