Conduction currents in composite aromatic polyamide insulation

Typical conduction currents have been determined for a composite polyamide sample at a constant poling temperature of 2000/spl deg/C and various poling fields ranging from 1.31 to 9.84 MVm/sup -1/. The conduction current is observed to decay with time, and does not reach steady-state even after five hours from the time the electric field is applied. Isochronal currents are plotted as a function of applied electric field at various constant temperatures for 152.4 /spl mu/m thick paper of composite polyamide. The electrode material is A1. Two distinct regions are observed, one at electric fields below 4 kVcm/sup -1/ where conduction currents are Ohmic; and the other at electric fields greater than 4kVcm/sup -1/, where the conduction currents deviate from Ohmic behaviors.<<ETX>>