抄録
As the core equipment of the DC transmission system, the converter transformers have been widely used in power systems. The space charge accumulation, transport and dissipation in oil-paper insulation are more complex than in polymeric insulating materials. Insulation damage caused by space charge is one of the main reasons for transformer fault, and has become a direct threat to the safe operation of the power system. Thermally stimulated depolarization current (TSDC) test is one of the important methods to analyze trap energy levels and charge transport properties of dielectric. TSDC test with different bias voltages (-25V, -12.5V, +25V and +50V) in temperature range of -100 °C ∼ 160 °C is used to distinguish dipole TSDC peaks from space charge ones in oil-paper insulation structure. The experimental results show that the -75 °C, 50 °C TSDC current peaks are not caused by space charge and the 150 °C peak meet the space charge characteristics. Activation energy, polarization intensity and relaxation time of each TSDC peak have been calculated correspondingly. The test has significance for better understanding of space charge accumulation, distribution and charge transport properties in oil-paper insulation, and is of great value for mechanism analysis of breakdown in oil-paper insulation.
本文言語 | English |
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ホスト出版物のタイトル | Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials |
出版社 | Institute of Electrical and Electronics Engineers Inc. |
ページ | 108-111 |
ページ数 | 4 |
巻 | 2015-October |
ISBN(印刷版) | 9781479989034 |
DOI | |
出版ステータス | Published - 2015 10月 8 |
外部発表 | はい |
イベント | 11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015 - Sydney, Australia 継続期間: 2015 7月 19 → 2015 7月 22 |
Other
Other | 11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015 |
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国/地域 | Australia |
City | Sydney |
Period | 15/7/19 → 15/7/22 |
ASJC Scopus subject areas
- 電子材料、光学材料、および磁性材料
- 材料化学
- 凝縮系物理学