Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model
A cable accessory is a critical component in constructing high-voltage direct current (HVDC) power grids, and it is typically composed of multiple materials. Due to the discontinuity of the insulation medium, it is prone to failure. This study focuses on a two-layered composite insulation medium sim...
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MDPI AG
2025-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/10/2552 |
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| author | Yuqi Liu Xinjing Cai |
| author_facet | Yuqi Liu Xinjing Cai |
| author_sort | Yuqi Liu |
| collection | DOAJ |
| description | A cable accessory is a critical component in constructing high-voltage direct current (HVDC) power grids, and it is typically composed of multiple materials. Due to the discontinuity of the insulation medium, it is prone to failure. This study focuses on a two-layered composite insulation medium simplified from HVDC cable accessories, and its surface potential decay (SPD) characteristics are related to the space charge transport characteristics. Previous studies on surface charge migration have been limited and primarily focused on single-layered insulation materials. However, the actual insulation structure is mostly composite. Therefore, it is of great practical significance to explore the surface charge migration characteristics of two-layered structures. This study presents a bipolar charge transport model after pre-depositing surface charges to investigate the surface charge migration characteristics of an ethylene–propylene–diene monomer (EPDM)/polyethylene (PE) two-layered polymer film. The effects of charge injection and trap related to nano-doping, local defects, and thermal aging on the surface potential decay (SPD) and space charge distribution in EPDM/PE were analyzed. The results show that the increase in the electron injection barrier slows surface charge dissipation and inhibits charge accumulation at the interface. An increase in the trapping coefficient leads to a higher surface potential in the stable state and a greater space charge density. During the early depolarization stage, the SPD rate is weakly dependent on the trap depth, with charge migration primarily governed by the external electric field. |
| format | Article |
| id | doaj-art-0891635c26224013b4656a153b2eca1f |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-0891635c26224013b4656a153b2eca1f2025-08-20T03:47:48ZengMDPI AGEnergies1996-10732025-05-011810255210.3390/en18102552Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport ModelYuqi Liu0Xinjing Cai1College of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaCollege of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaA cable accessory is a critical component in constructing high-voltage direct current (HVDC) power grids, and it is typically composed of multiple materials. Due to the discontinuity of the insulation medium, it is prone to failure. This study focuses on a two-layered composite insulation medium simplified from HVDC cable accessories, and its surface potential decay (SPD) characteristics are related to the space charge transport characteristics. Previous studies on surface charge migration have been limited and primarily focused on single-layered insulation materials. However, the actual insulation structure is mostly composite. Therefore, it is of great practical significance to explore the surface charge migration characteristics of two-layered structures. This study presents a bipolar charge transport model after pre-depositing surface charges to investigate the surface charge migration characteristics of an ethylene–propylene–diene monomer (EPDM)/polyethylene (PE) two-layered polymer film. The effects of charge injection and trap related to nano-doping, local defects, and thermal aging on the surface potential decay (SPD) and space charge distribution in EPDM/PE were analyzed. The results show that the increase in the electron injection barrier slows surface charge dissipation and inhibits charge accumulation at the interface. An increase in the trapping coefficient leads to a higher surface potential in the stable state and a greater space charge density. During the early depolarization stage, the SPD rate is weakly dependent on the trap depth, with charge migration primarily governed by the external electric field.https://www.mdpi.com/1996-1073/18/10/2552surface chargebipolar charge transportsurface potential decaydouble-layer insulating medium |
| spellingShingle | Yuqi Liu Xinjing Cai Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model Energies surface charge bipolar charge transport surface potential decay double-layer insulating medium |
| title | Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model |
| title_full | Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model |
| title_fullStr | Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model |
| title_full_unstemmed | Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model |
| title_short | Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model |
| title_sort | research on surface charge migration characteristics of two layered polymer film based on bipolar charge transport model |
| topic | surface charge bipolar charge transport surface potential decay double-layer insulating medium |
| url | https://www.mdpi.com/1996-1073/18/10/2552 |
| work_keys_str_mv | AT yuqiliu researchonsurfacechargemigrationcharacteristicsoftwolayeredpolymerfilmbasedonbipolarchargetransportmodel AT xinjingcai researchonsurfacechargemigrationcharacteristicsoftwolayeredpolymerfilmbasedonbipolarchargetransportmodel |