Influence of molecular additives on positive streamer propagation in ester liquids

被引：0

作者：

Unge, Mikael ^{[1
]}

Singha, Santanu ^{[1
]}

Ingebrigtsen, Stian ^{[2
]}

Linhjell, Dag ^{[3
]}

Lundgaard, Lars E. ^{[3
]}

机构：

[1] ABB Corp Res, SE-72178 Vasteras, Sweden

[2] ABB AS, NO-5147 Fyllingsdalen, Norway

[3] SINTEF Energy Res, Dept Elect Power Engn, NO-7465 Trondheim, Norway

来源：

PROCEEDINGS OF THE 2014 IEEE 18TH INTERNATIONAL CONFERENCE ON DIELECTRIC LIQUIDS (ICDL 2014) | 2014年

关键词：

breakdown voltage; impulse; ester; molecular additives; dielectric liquid; CYCLOHEXANE;

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：

Molecular additives i.e. additives with specific molelcular propertie, has been shown to influence breakdown properties of dielectric liquids, in particular lightning impulse characteristics. In this study we investigate the propagation of streamers in a natural ester liquid with and without molecular additives in a needle plane electrode configuration with a 5 mm gap. In order to study streamer propagation, including fast events, in such a small gap, impulse voltages with 20-40 ns rise times are used. One molecular additive, dimethylaniline, has a low ionization potential and another, azobenzene, a low 1st excitation energy in comparison with the natural ester. Both additives increase the acceleration voltage with approximately 40% at a concentration of 5 w%. Different processes may be involved in the breakdown event for the different additives, which is indicated by differences in the breakdown voltage data.

引用

页数：4

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