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| Content Provider | IET Digital Library |
|---|---|
| Author | Feng, Dawei Hao, Jian Yang, Lijun Liao, Ruijin Chen, Xin Li, Jian |
| Abstract | Insulation oil is an important dielectric in power devices, and many studies on mixed insulation oil have been conducted in recent years to improve the performance of insulation oils. To replace mineral oil directly, the authors previously developed a novel three-element mixed insulation oil successfully; the main parameters of which satisfy the IEC 60296-2012 standard for mineral oil. In the present study, the AC breakdown properties of insulation paper (pressboard) immersed by the new mixed oil and naphthenic mineral oil were compared. For both insulation oils, the increase in temperature cannot significantly reduce the breakdown strength of oil-immersed insulation paper (pressboard) at a low moisture content, and the increment of moisture content cannot reduce the breakdown voltage at a low temperature (25°C). The breakdown voltage decreases only when the two factors increase simultaneously. For the mixed and mineral oils, the AC breakdown voltage of oil-immersed paper (pressboard) with different thicknesses has significant difference. The mineral oil has a high breakdown voltage for the thin insulation paper, whereas the mixed oil has a high breakdown voltage when the thickness of the insulation paper (pressboard) exceeds 0.2 mm. This phenomenon is mainly caused by the breakdown field strength that varies with the increase of dielectric thickness and the different change trends of paper (pressboard) immersed with the mixed and the mineral oils. Moreover, the stack of thin multilayer insulation paper enables the mixed oil-immersed paper to have a higher breakdown strength than the mineral oil-immersed paper. For the AC breakdown voltage of oil-immersed pressboard with an oil-gap structure, the mixed oil is comprehensively superior to the mineral oil due to its larger relative permittivity. |
| Starting Page | 298 |
| Ending Page | 305 |
| Page Count | 8 |
| Volume Number | 5 |
| e-ISSN | 23977264 |
| Issue Number | Issue 3, Jun (2020) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/hve/5/3 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/hve.2019.0103 |
| Journal | High Voltage |
| Publisher | The Institution of Engineering and Technology CEPRI |
| Publisher Date | 2019-10-22 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution-Non Commercial-No Derivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/) |
| Subject Keyword | AC Breakdown Characteristic AC Breakdown Voltage Breakdown Field Strength Breakdown Strength Dielectric Breakdown And Discharges Dielectric Thickness Electric Breakdown Insulating Oils Insulation Paper Mineral Oil-immersed Paper Mixed Oil-immersed Paper Moisture Content Naphthenic Mineral Oil Oil-gap Structure Oil-immersed Insulation Paper Oil-immersed Pressboard Organic Insulation Paper Temperature 25.0 DegC Thin Insulation Paper Thin Multilayer Insulation Paper Three-element Mixed Insulation Oil |
| Content Type | Text |
| Resource Type | Article |
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