Investigation on effect of semiconducting screen on space charge behaviour of polypropylene?based polymers for HVDC cables

High voltage direct current (HVDC) power transmission cable is critical for realising sustainability through renewable energy revolution. Eco-friendly thermoplastic polypropylene (PP)-based polymers/nanocomposites are regarded as promising candidates replacing thermoset crosslinked polyethylene (XLPE) cables. As an essential component of the extruded HVDC improving conductor/insulation interface and suppressing charge injection to insulation at high DC electrical stresses, developing semiconducting (SC) screens that compatible with PP-based similar importance but has not been well studied yet. This work aims designing investigating space behaviours SC/PP/SC sandwich specimen unfold effect materials, bonding methods, applied electric field, temperature on injection, accumulation, transportation, dissipation in insulation. Although conventional thermal, mechanical, low field characterisations demonstrated all developed materials meet performance criteria commercial their local distribution varied significantly fields. Compared traditional non-bonded configuration used lab-scale, was enhanced hot-pressed samples tightly bonded interfaces, which better reflects real situation further intensified injections. Besides, our results also revealed strongly influence mobilities consequently insulations.