Summary
Oil immersed paper insulation is widely used in converter transformers for its good electrical and mechanical properties. Under high DC voltage, space charge accumulates in oil-paper insulation, leads to the electric field distortion, and eventually enormously affects its performance. Large amounts of research were published on the space charge characteristics of oil-paper insulation under different conditions including temperature, temperature gradient and polarity reversal, however there was little report on the influence of composition of oil and paper on the space charge characteristics. In this article the space charge characteristics of different combination of transformer oils (Karamay 25# oil, Nytro Libra oil) and papers (Type I from XD factory, ? imported from France) were studied to evaluate the influence of composition of oil and paper. The result showed that the combination of Karamay 25# oil and paper ? performed well with less space charge accumulated inside the materials. Finally, by using high resolution scanning electron microscope, the influence of the structure of cellulose on the space charge behaviour was discussed.
Additional informations
| Publication type | ISH Collection |
|---|---|
| Reference | ISH2015_142 |
| Publication year | 2015 |
| Publisher | ISH |
| File size | 630 KB |
| Price for non member | Free |
| Price for member | Free |
Authors
Schumann Sven, Xu Yang, Gao Wensheng, Cui Boyuan
