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<p>The AC dielectric property of insulating material is very important for high-voltage AC power equipment. In this work, the electric field assist is used to improve the AC dielectric property. The low-density polyethylene (LDPE) as a typical insulating material was prepared under different assisted electric field. The aggregation structures of LDPE samples were characterized by polarizing microscopy and X-ray diffractometer, and the time-domain response current spectra were also tested. The results demonstrate that the crystallinity and AC breakdown strength of the 0.5&#xa0;kV/mm-assisted LDPE increase by 17% and 18.5% compared with those of the untreated LDPE. All samples show nonlinear conductivity and permittivity under high excitation electric field, whereas the electric-field assisted LDPE is higher in the switching electric field than the untreated one. In addition, the equivalent dielectric parameters of LDPE decreases when the assisted electric field increases from 0 to 0.5&#xa0;kV/mm, and they increase when the assisted electric field is larger than 0.5&#xa0;kV/mm. This work provides a foundation for the development of HVAC power cable insulation.</p>

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Refinement of high-voltage AC dielectric properties of low-density polyethylene by the electric field assist

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Xinyu Wang,
  • Zhonghua Li,
  • Yongjun Li,
  • Chenfeng Yu,
  • Huan Zheng,
  • Yongsen Han

摘要

The AC dielectric property of insulating material is very important for high-voltage AC power equipment. In this work, the electric field assist is used to improve the AC dielectric property. The low-density polyethylene (LDPE) as a typical insulating material was prepared under different assisted electric field. The aggregation structures of LDPE samples were characterized by polarizing microscopy and X-ray diffractometer, and the time-domain response current spectra were also tested. The results demonstrate that the crystallinity and AC breakdown strength of the 0.5 kV/mm-assisted LDPE increase by 17% and 18.5% compared with those of the untreated LDPE. All samples show nonlinear conductivity and permittivity under high excitation electric field, whereas the electric-field assisted LDPE is higher in the switching electric field than the untreated one. In addition, the equivalent dielectric parameters of LDPE decreases when the assisted electric field increases from 0 to 0.5 kV/mm, and they increase when the assisted electric field is larger than 0.5 kV/mm. This work provides a foundation for the development of HVAC power cable insulation.