Effect of Waveform on Breakdown Characteristics of Oil-paper Insulation Under Double-exponential Non-standard Lightening Impulse

被引：0
|
作者：
Ni H. [1 ]
Zhang Q. [1 ]
Zhao Y. [1 ]
Liu X. [1 ]
Guo C. [1 ]
Guo N. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 03期
基金：
国家重点研发计划;
关键词：
Breakdown voltage; Equivalent method; Oil gap; Oil-impregnated pressboard; Waveform;
D O I：
10.13336/j.1003-6520.hve.20190226010
中图分类号：
学科分类号：
摘要：
In order to investigate the rationality of determining insulation margin of oil-immersed power transformers with standard lightning impulse and the effectiveness of utilizing double-exponential non-standard lightning impulse in insulation tests, we studied the effects of double-exponential impulse waveforms on the discharge characteristics of oil gap and oil-impregnated pressboard. The results show that the breakdown voltage of oil gap and oil-impregnated pressboard increases as the wavefront becomes longer or the wavetail gets shorter. The wavefront has greater influences on the breakdown characteristics of oil-impregnated pressboard, while the wavetail affects oil gap much more remarkably. Based on the experimental data, the corresponding empirical formula is summarized, and the electrical equivalence between the breakdown voltage of oil-paper insulation under non-standard lightning impulse and standard lightning impulse is established with the front time and tail time as the time parameter. The results of this study can provide an important support for the insulation design and test of oil-immersed power transformers. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：743 / 750
页数：7
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