Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field
Abstract In this study, characteristics of charge injection under extra high electric field (above 100 kV/mm) in cross‐linked polyethylene (XLPE) were investigated by experiments of conduction current and space charge. The results show that current density from low electric field to sample breakdown...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-10-01
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| Series: | High Voltage |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/hve2.12039 |
| _version_ | 1811312993666859008 |
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| author | Xi Zhu Yi Yin Suman Peng Jiandong Wu Wenpeng Li Xin Chen Zhenyu Li Jianxin Guan |
| author_facet | Xi Zhu Yi Yin Suman Peng Jiandong Wu Wenpeng Li Xin Chen Zhenyu Li Jianxin Guan |
| author_sort | Xi Zhu |
| collection | DOAJ |
| description | Abstract In this study, characteristics of charge injection under extra high electric field (above 100 kV/mm) in cross‐linked polyethylene (XLPE) were investigated by experiments of conduction current and space charge. The results show that current density from low electric field to sample breakdown corresponds to space charge limited current (SCLC) theory. More specifically, Schottky current is similar to experiment current before 100 kV/mm, while the J–E curve conforms to a modified SCLC theory after 100 kV/mm. Besides, the non‐linear coefficient of J–E curve from 100 kV/mm to extra high electric field is smaller than theoretical value, and the injection depth of space charge is restricted as the field becomes higher than 100 kV/mm, which may be caused by the negative differential mobility of charge. Driven by extra high electric field, charge collides with lattice of dielectric and scatters. As a result, mean free time of charge decreases and charge mobility is reduced with the increased field. Consequently, considering the decrease in charge mobility, a mobility‐limited charge injection equation is proposed, and the validity of the proposed equation under extra high electric field is demonstrated by space charge simulation. |
| first_indexed | 2024-04-13T10:46:25Z |
| format | Article |
| id | doaj.art-007549a7b29b4f979ed9960e7c447a9a |
| institution | Directory Open Access Journal |
| issn | 2397-7264 |
| language | English |
| last_indexed | 2024-04-13T10:46:25Z |
| publishDate | 2021-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | High Voltage |
| spelling | doaj.art-007549a7b29b4f979ed9960e7c447a9a2022-12-22T02:49:47ZengWileyHigh Voltage2397-72642021-10-016578279210.1049/hve2.12039Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric fieldXi Zhu0Yi Yin1Suman Peng2Jiandong Wu3Wenpeng Li4Xin Chen5Zhenyu Li6Jianxin Guan7Department of Electrical Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai ChinaDepartment of Electrical Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai ChinaDepartment of Electrical Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai ChinaDepartment of Electrical Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai ChinaState Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Corporation Beijing ChinaState Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Corporation Beijing ChinaState Grid of Corporation China Beijing ChinaState Grid of Corporation China Beijing ChinaAbstract In this study, characteristics of charge injection under extra high electric field (above 100 kV/mm) in cross‐linked polyethylene (XLPE) were investigated by experiments of conduction current and space charge. The results show that current density from low electric field to sample breakdown corresponds to space charge limited current (SCLC) theory. More specifically, Schottky current is similar to experiment current before 100 kV/mm, while the J–E curve conforms to a modified SCLC theory after 100 kV/mm. Besides, the non‐linear coefficient of J–E curve from 100 kV/mm to extra high electric field is smaller than theoretical value, and the injection depth of space charge is restricted as the field becomes higher than 100 kV/mm, which may be caused by the negative differential mobility of charge. Driven by extra high electric field, charge collides with lattice of dielectric and scatters. As a result, mean free time of charge decreases and charge mobility is reduced with the increased field. Consequently, considering the decrease in charge mobility, a mobility‐limited charge injection equation is proposed, and the validity of the proposed equation under extra high electric field is demonstrated by space charge simulation.https://doi.org/10.1049/hve2.12039charge injectioncurrent densityelectric fieldsspace chargespace‐charge‐limited conductionXLPE insulation |
| spellingShingle | Xi Zhu Yi Yin Suman Peng Jiandong Wu Wenpeng Li Xin Chen Zhenyu Li Jianxin Guan Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field High Voltage charge injection current density electric fields space charge space‐charge‐limited conduction XLPE insulation |
| title | Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field |
| title_full | Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field |
| title_fullStr | Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field |
| title_full_unstemmed | Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field |
| title_short | Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field |
| title_sort | mobility limited charge injection in cross linked polyethylene under extra high electric field |
| topic | charge injection current density electric fields space charge space‐charge‐limited conduction XLPE insulation |
| url | https://doi.org/10.1049/hve2.12039 |
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