Constant-current corona charging of Teflon PFA

Author

Xia Zhang-Fu ; Hai, Ding ; Guo-mao, Yang Lu ; Ting-Ji, Lu ; Xi-Min, Sun

Author_Institution

Pohl Inst., Tongji Univ., Shanghai, China

Volume

26

Issue

1

fYear

1991

fDate

2/1/1991 12:00:00 AM

Firstpage

35

Lastpage

41

Abstract

Experiments in which 25-μm-thick films of tetrafluoroethylene-per-fluoromethoxyethylene copolymer (Teflon PFA) were charged positively and negatively with a constant-current corona at different temperatures and subsequently discharged are discussed. The time behaviors of surface potential, total current, and conduction current during constant-current and constant-voltage charging are compared. The mean charge depth is found to increase with negative constant-current and constant-voltage charging at elevated temperatures. It is shown that, compared with constant-voltage charging, constant-current charging leads to a more prominent mean-charge-depth shift towards the back electrode and to an improved charge stability in Teflon PFA, since a large amount of the deeper bulk traps is being filled

Keywords

electrets; polymer films; 25 micron; PTFE; Teflon PFA; charge stability; conduction current; constant current corona charging; constant-current charging; constant-voltage charging; deeper bulk traps; different temperatures; electret material; elevated temperatures; fluorocarbon polymer material; mean charge depth; mean-charge-depth shift; negative constant-current; surface potential; tetrafluoroethylene-per-fluoromethoxyethylene copolymer; time behaviors; total current; Corona; Electrodes; Electrostatic measurements; Feedback; Power supplies; Power system modeling; Surface charging; Surface morphology; Temperature; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.68224

Filename

68224