Charging and Discharging Current Characteristics of Polypropylene Film under Varied Electric Fields

Charging and discharging current behavior under high DC electric field in polypropylene (PP) film is closely related to the charge transport and accumulation process, which has an important effect on the electrical insulating properties of PP. In this paper, the dependence of the charging and discha...

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Bibliographic Details
Published inEnergies (Basel) Vol. 15; no. 14; p. 5107
Main Authors Xing, Zhaoliang, Tian, Fuqiang, Guo, Shaowei, Zhang, Shuting, Li, Fei, Liang, Jieyi, Cui, Huize, Dai, Xiying
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2022
Subjects
Accumulation
Carrier mobility
Charge injection
Charge transport
Charging
Conduction
conduction current
DC breakdown
Electric fields
polypropylene film
Space charge
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Summary:Charging and discharging current behavior under high DC electric field in polypropylene (PP) film is closely related to the charge transport and accumulation process, which has an important effect on the electrical insulating properties of PP. In this paper, the dependence of the charging and discharging current of polypropylene films on time and electric field has been comprehensively studied. The results showed that the transient and steady current values of the charging and discharging process increase with the increase of electric field. Dependence of the charging current on the electric field conformed well to the space charge limited current (SCLC) theory with a transition electric field of 270 kV/mm, at which the charge transport changed from ohmic conduction to SCLC conduction. The carrier mobility derived from the discharging current became significantly smaller with increase of the charging electric field. The charge accumulation after discharging was derived from the integration of the difference of the charging and discharging current and it showed an increase with the electric field and increased sharply above a certain threshold electric field (the same as the transition electric field in SCLC theory). It was proved that the conduction current and charge accumulation evolution and dependence on the electric field were mainly determined by the balance between the electrode charge injection process and the bulk conduction process.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15145107