Research on the impact of transformer switching-off on core residual magnetism
Magnetizing inrush current caused by transformer no-load switching can lead to various issues in power grid operations. Techniques such as phase-controlled switching are effective in mitigating these effects， with the key factor being the measurement of the transformer core’s residual magnetism. Thi...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
zhejiang electric power
2025-02-01
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| Series: | Zhejiang dianli |
| Subjects: | |
| Online Access: | https://zjdl.cbpt.cnki.net/WKE3/WebPublication/paperDigest.aspx?paperID=564acdbe-b1d0-4fdb-87b3-f9b4dd9580db |
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| Summary: | Magnetizing inrush current caused by transformer no-load switching can lead to various issues in power grid operations. Techniques such as phase-controlled switching are effective in mitigating these effects， with the key factor being the measurement of the transformer core’s residual magnetism. This paper investigates the impact of transformer switching-off on core residual magnetism. First， based on the transformer switching-off circuit， the switching-off interruption overvoltage is estimated， and its qualitative impact on core residual magnetism is analyzed. Next， using J-A hysteresis simulation， the relationship between transformer core residual magnetism and switching-off angle， as well as the magnetic flux trajectory after switching-off， is explored. Finally， quantitative measurement of the transformer’s residual magnetism is conducted， revealing the evolution patterns of actual residual magnetism. The theoretical analysis and simulation-based findings are validated. |
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| ISSN: | 1007-1881 |