Electrical testing (electricity lines and grids)

The main tests carried out to diagnose and characterise the condition of overhead and underground
power lines are shown below:

• Conductor resistance
• Screen resistance
• Dielectric strength of the sheath
• Partial discharges in conductors and terminals
• Main insulation status evaluation: Tan delta test
• Overhead power line impedance
• Phase sequence and ringing
• Underground line tracing