What is the role of the Semi-Conductive layers in MV cable construction?

In Medium Voltage applications (typically 3.6/6kV to 26/35kV), high electrical stress can cause ionization and insulation breakdown.

Conductor Shield: A semi-conductive layer over the conductor to smooth out the electric field.

Insulation Shield: A semi-conductive layer over the XLPE to ensure a uniform radial electric field. These layers prevent “electrical treeing” and significantly extend the service life of the cable.