Depolarization currents in corona charged aromatic polyamides

Author

Sussi, M.A. ; Raju, G. R Govinda

Author_Institution

Dept. of Electr. Eng., Windsor Univ., Ont., Canada

fYear

1991

fDate

8-12 Jul 1991

Firstpage

93

Abstract

An analysis is made of thermally stimulated depolarization (TSD) currents in aromatic polyamide (NOMEX), which is a high temperature material. Studies were carried out with films of 75 μm and 127 μm thickness, charged using a corona discharge in a point-plane gap in air at atmospheric pressure. TSD currents were measured over a temperature range of 0-200°C, and the influence of various poling conditions on the TSD currents has been investigated. The effect of vacuum deposited aluminum as electrode material has been investigated. Corona charged aromatic polyamides with positive polarity voltages show TSD current of either polarity depending upon the temperature range. The activation energy for aluminum electrodes was observed to be 0.5 eV. The TSD currents for the low temperature peak are considered to be electronic. The abnormal TSD currents observed at lower temperatures are also considered to be due to negative charge carriers

Keywords

corona; dielectric polarisation; polymer films; thermally stimulated currents; 0 to 200 degC; 127 micron; 75 micron; NOMEX; TSD currents; activation energy; corona charged aromatic polyamides; corona discharge; negative charge carriers; point-plane gap; poling conditions; positive polarity voltages; thermally stimulated depolarization; vacuum deposited Al electrode; Aluminum; Atmospheric measurements; Charge carriers; Corona; Current measurement; Electrodes; Temperature dependence; Temperature distribution; Temperature measurement; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on

Conference_Location

Tokyo

Print_ISBN

0-87942-568-7

Type

conf

DOI

10.1109/ICPADM.1991.172014

Filename

172014