Summary
This paper reports on the development of a 66 kV-20 MVA gas-insulated transformer that uses nitrogen (N₂), a natural origin gas, with the aim of reducing the environmental impact of conventional SF₆ gas-insulated transformers. N2 offers excellent environmental characteristics, including high safety and a global warming potential (GWP) of zero. However, its cooling and insulating performance at the same gas pressure is about one-third of that of sulfur hexafluoride
Read more Read less(SF₆), leading to challenges such as increased equipment size. To address these challenges, structural optimization using thermal fluid analysis and the introduction of a novel winding structure were implemented to minimize size increases while ensuring the required performance.
Performance verification tests on the prototype natural origin gas-insulated transformer yielded favorable results in gas leak test, noise test, and temperature rise test. Although dielectric breakdown occurred under certain conditions during insulation tests, it is expected that minor insulation countermeasures will suffice. Therefore, the natural origin gas-insulated transformer is now feasible as a product.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A2_10760_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Japan |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
NOGUCHI Naoki - Toshiba Energy Systems & Solutions Corporation Japan; ISHIKAWA Taku - Toshiba Energy Systems & Solutions Corporation Japan; TSUKAO Shigeyuki - TEPCO Power Grid, Inc. Japan; UCHIDA Keisuke - Toshiba Energy Systems & Solutions Corporation Japan; CHIGIRI Takeshi - Toshiba Energy Systems & Solutions Corporation Japan; TAKANO Kei - Toshiba Energy Systems & Solutions Corporation Japan
Keywords
Gas, insulated Transformer (GIT), Natural Origin Gas, SF6, free
