Title :
On the influence of storage time on the long-term breakdown characteristics of solid synthetic materials
Author_Institution :
Inst. of High Voltages, Warsaw Univ. of Technol., Poland
Abstract :
The author presents results of accelerated voltage tests performed with two model arrangements reflecting conditions of degradation typical for cast epoxy and extruded low-density polyethylene insulations, i.e. internal PD (partial discharge) in regular voids and ET (electrical treeing) from sharp points. As the intervals from the time at which the specimens had been manufactured until the execution of the tests varied from 2 days up to 10 years, the results reflected the influence of storage time on the life of the specimens. No significant variations of inception voltage with storage time was observed for the void arrangement; however they are clearly visible for the point arrangement. Due to the low sensitivity of the method of measurement used in the latter case, differences relevant to sample preparation remained undetected
Keywords :
electric breakdown of solids; insulation testing; life testing; organic insulating materials; partial discharges; polymers; 2 days to 10 years; SEM inspection; accelerated voltage tests; cast epoxy; electrical treeing; epoxy resin; extruded low-density polyethylene insulations; inception voltage; internal PD; internal partial discharge; long-term breakdown characteristics; regular voids; solid synthetic materials; storage time; Degradation; Dielectrics and electrical insulation; Electric breakdown; Insulation testing; Life estimation; Partial discharges; Performance evaluation; Polyethylene; Trees - insulation; Voltage;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1989., Proceedings of the 3rd International Conference on
Conference_Location :
Trondheim
DOI :
10.1109/ICSD.1989.69170
