Title :
Discharges on insulator surfaces after voltage reversal
Author :
Kliem, H. ; Hessler, A. ; Arlt, G.
Author_Institution :
Inst. fur Werkstoffe der Elektrotech., Aachen Univ. of Technol., West Germany
Abstract :
An avalanche effect along insulator surfaces in a metal-insulator-metal structure was studied experimentally. A physical model is proposed to explain the observed current spikes. According to this model, during negative poling, voltage corona charging from the edge of the electrode to the neighboring insulator surface occurs. The charges are trapped in surface states. The voltage ramp releases these charges in opposite directions by coulombic attraction. The charges are then accelerated towards the electrode and initiate an avalanche. The waiting time tw influences the threshold voltage in a specified way. The trapped charges seem to increase their own trap depth during tw
Keywords :
corona; discharges (electric); electron avalanches; insulation testing; metal-insulator-semiconductor structures; avalanche effect; coulombic attraction; current spikes; insulator surfaces; metal-insulator-metal structure; negative poling; physical model; surface states; threshold voltage; trap depth; trapped charges; voltage corona charging; voltage ramp; voltage reversal; waiting time; Current measurement; Electric breakdown; Electric variables measurement; Glass; Insulation; Polyimides; Stress measurement; Surface discharges; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1988. Annual Report., Conference on
Conference_Location :
Ottawa, Ont.
DOI :
10.1109/CEIDP.1988.26362
