Title :
Influence of sintering temperature on the flashover performance of alumina insulators in vacuum
Author :
Ding, Lijian ; Li, C.R. ; Wang, Jingchun ; Wang, Wei
Author_Institution :
Dept. of Electr. Eng., North China Electr. Power Univ., Beijing, China
Abstract :
Investigates the influence of sintering conditions on the flashover/preflashover characteristic of alumina insulators in vacuum under an impulse voltage. Four kinds of alumina insulator were studied and they were prepared using a same formula with different sintering conditions. The phenomena of surface pre-flashover and flashover in vacuum have been observed. Based on the experimental results, the characteristics of preflashover and flashover are varied with different kinds of test samples. It was found that the insulators with higher sintering temperature could have a lower flashover voltage, and more active preflashover. According to the analysis of scanning electron microscope (SEM) of alumina insulator, it is considered that the methods to prepare alumina samples can effect the microstructure and the preflashover and flashover performance of alumina insulators
Keywords :
alumina; dielectric materials; flashover; insulating materials; scanning electron microscopy; sintering; surface discharges; vacuum breakdown; vacuum insulation; Al2O3; alumina insulator; alumina insulators; alumina samples; flashover; flashover characteristics; flashover performance; flashover voltage; impulse voltage; microstructure; preflashover; preflashover characteristics; scanning electron microscope; sintering conditions; sintering temperature; surface pre-flashover; test samples; vacuum; Circuit testing; Dielectrics and electrical insulation; Electrodes; Flashover; Insulator testing; Optical surface waves; Scanning electron microscopy; Temperature; Vacuum systems; Voltage;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 2000. Proceedings. ISDEIV. XIXth International Symposium on
Conference_Location :
Xi´an
Print_ISBN :
0-7803-5791-4
DOI :
10.1109/DEIV.2000.877265
