Thermal Ageing Effect on the Failure Time of Oil-Paper Insulation at Combined AC-DC Voltage

被引：0
|
作者：
Tao, Fengbo [1 ]
Li, Jiansheng [1 ]
Wei, Chao [1 ]
Li, Yuanlong [2 ]
Zhang, Jing [2 ]
机构：
[1] Jiangsu Elect Power Co, Res Inst, Power Equipment Condit Assessment Ctr, Nanjing, Jiangsu, Peoples R China
[2] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, Sch Elect Engn, Chongqing, Peoples R China
来源：
2016 IEEE ELECTRICAL INSULATION CONFERENCE (EIC) | 2016年
关键词：
converter transformer; oil-paper insulation; combined AC-DC voltage; thermal aging; breakdown voltage; failure time; ELECTRICAL BREAKDOWN; STRENGTH;
D O I：
暂无
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：
The oil-paper insulation of converter transformer withstands a long time electrical aging by combined AC-DC voltage and thermal aging during operation. The aging failure mode of converter transformers insulation exhibits a great difference with that of AC transformers. In this paper, a set of accelerated thermal aging experiments at 130 degrees C were designed, oil-paper specimens were aged for 5, 10, 20 and 35 days, respectively. The unaged oil-paper specimens were also prepared for comparison. The breakdown voltage and failure time of oil-paper specimens of different aging times at AC and combined AC-DC voltage were measured, respectively. The relationship between the failure time and aging time is obtained by using Weibull analysis method. The experiment results show that the breakdown voltage of oil-paper specimens all decrease not much with the increase of thermal aging time. The oil-paper specimens have a longer failure time at combined AC-DC voltage compared with that at AC voltage.
引用
收藏
页码：284 / 287
页数：4
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