Title :
An experimental technique to study space charge injection in polymeric materials under AC voltage
Author :
Hadid, A. ; Laurent, C.
Author_Institution :
Lab. de Genie Electr., Univ. Paul Sabatier, Toulouse, France
fDate :
12/1/1992 12:00:00 AM
Abstract :
An experimental technique for detecting space charge injection in polymeric material under divergent AC field is described. The automated charge detector can be used for studying charge injection as a function of voltage and time in the 0.001-0.01-pC range. Charge injection is a strong effect above a critical voltage Vc. For a moderate overvoltage, three different phases can be distinguished in the evolution of the dielectric properties: (1) a discharge-free regime, in which low-frequency space charge injection occurs; (2) a transition regime, with high-frequency discharge-like pulses superimposed on the charge injection signal; and (3) an electrical tree propagation regime
Keywords :
electric breakdown of solids; organic insulating materials; polymers; AC voltage; automated charge detector; critical voltage; discharge-free regime; divergent AC field; electrical tree propagation regime; experimental technique; high-frequency discharge-like pulses; low-frequency space charge injection; moderate overvoltage; polymeric materials; space charge injection; transition regime; Aging; Charge measurement; Current measurement; Dielectrics; Electrodes; Needles; Partial discharges; Polymers; Space charge; Voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
