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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Science

Background:

  • State-of-the-art high-voltage direct-current (HVDC) power cable insulation relies on cross-linked low-density polyethylene (XLPE).
  • Improving electrical field withstand capability and power transmission efficiency is crucial for sustainable energy solutions.
  • Residual electrical conductivity limits the performance of HVDC insulation materials.

Purpose of the Study:

  • To investigate the effect of incorporating high-density polyethylene (HDPE) into low-density polyethylene (LDPE) insulation on DC conductivity.
  • To explore a novel design concept for enhancing HVDC power cable insulation.

Main Methods:

  • Addition of small amounts (as low as 1 wt %) of HDPE to an LDPE resin.
  • Characterization of the nanostructure, specifically crystalline lamellae, of the modified insulation material.
  • Measurement of DC conductivity at high electric fields (30-40 kV mm⁻¹) and elevated temperatures (70 °C).

Main Results:

  • A drastic reduction in DC conductivity was observed with the addition of HDPE.
  • Even 1 wt % HDPE introduced thicker crystalline lamellae, finely distributed in the material.
  • DC conductivity decreased by approximately one order of magnitude to ~10⁻¹⁵ S m⁻¹ under tested conditions.

Conclusions:

  • Incorporating HDPE into LDPE offers an effective strategy to reduce DC conductivity in HVDC insulation.
  • The modification of crystalline nanostructure is key to improving insulation performance.
  • This approach presents a viable alternative design for advanced HVDC power cable insulation.