ROLE OF COULOMBIC CENTERS ON INSULATOR SURFACE BREAKDOWN CHARACTERISTICS

被引:23
作者
ASOKAN, T
SUDARSHAN, TS
机构
[1] Department of Electrical and Computer Engineering, University of South Carolina, Columbia, SC
来源
IEEE TRANSACTIONS ON ELECTRICAL INSULATION | 1992年 / 27卷 / 05期
关键词
D O I
10.1109/14.256479
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Pulsed surface breakdown (flashover) and conditioning characteristics of polycrystalline alumina and single crystal quartz (x???-cut and z???-cut) in vacuum were investigated. A new electrode system was designed and validated which greatly facilitates time-coordinated electrical and optical measurements of surface discharges along insulators. The surface flashover characteristics obtained using the new electrode system are discussed and compared with those obtained using the conventional parallel plane electrode system. A new procedure for the conditioning of insulators in vacuum is presented. The single crystal quartz specimens were found to exhibit higher conditioned breakdown strength (approximately 350 kV/cm) compared to polycrystalline alumina (approximately 230 kV/cm). The mechanism associated with the breakdown characteristics are discussed in terms of negative and positive space charge formation involving coulombic centers (traps) and adsorbed layers. The pre-breakdown and breakdown X-ray activities and luminosity are also presented and discussed along the above lines.
引用
收藏
页码:1040 / 1049
页数:10
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