The characteristic impedance of a transmission line is a critical parameter for maintaining voltage stability and maximizing power transfer efficiency. When a power line is terminated with a load impedance that is equal to its characteristic impedance, it is called impedance matching.

When the line is impedance-matched, it behaves as if it were infinitely long, and there are no voltage or current reflections at the load end. This prevents standing waves, minimizes power losses, and helps maintain a stable voltage profile along the line. For our OHTL and underground cable laying equipment, understanding this principle is crucial for designing and implementing stable and efficient power systems.