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Significant Suppression of High Electric Field Regions in XLPE via Voltage Stabilisers
Summary
This study investigates methods to suppress high electric field concentrations in cross-linked polyethylene cable insulation, a key challenge for high-voltage direct current applications. The researchers analyze how material modifications and interface engineering can redistribute electric stress more uniformly within XLPE. The findings contribute to improving the reliability and longevity of high-voltage power cables.
ABSTRACT Dielectric degradation typically originates from local defects. The resulting electric field concentration accelerates defect growth. Suppressing field distortion arising from such local weaknesses has long been a major challenge in electrical insulation. In this work, we incorporated the voltage stabiliser anthrone (ET) into cross‐linked polyethylene (XLPE). This design enables field‐driven adaptive migration and charge trapping, thereby dynamically regulating local electric fields. Space charge analysis reveals that ET captures charge and creates a reverse electric field. This process inhibits charge injection and transport, significantly reduces internal field distortion and results in a negative electric field coefficient effect. Notably, at 110 kV/mm the distortion ratio decreases from 118.6% in XLPE to only 0.05% in ET/XLPE, a reduction by more than 2000 times. These findings highlight the critical role of voltage stabilisers in enhancing dielectric reliability.