Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop
The residual magnetism of the iron core of power transformers can cause an excitation inrush current, posing a threat to the safe and stable operation of the power grid. This paper proposes a transformer remanence measurement method based on a demagnetization hysteresis loop to address the problems...
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MDPI AG
2025-05-01
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| author | Dingyuan Li Jing Zhou Zhanlong Zhang Yu Yang Zijian Dong Wenhao He Xichen Pei Jiatai Gao Siyang Chen Zhicheng Pan |
| author_facet | Dingyuan Li Jing Zhou Zhanlong Zhang Yu Yang Zijian Dong Wenhao He Xichen Pei Jiatai Gao Siyang Chen Zhicheng Pan |
| author_sort | Dingyuan Li |
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| description | The residual magnetism of the iron core of power transformers can cause an excitation inrush current, posing a threat to the safe and stable operation of the power grid. This paper proposes a transformer remanence measurement method based on a demagnetization hysteresis loop to address the problems of large errors, complex operation, and poor universality in existing remanence measurement methods. This method is designed for off-grid transformers to avoid potential interference to the power grid caused by current pulses during the measurement process. This method constructs an RLC oscillation circuit that utilizes capacitor energy storage and iron core magnetic field energy conversion, combined with the dynamic characteristics of hysteresis loops, to achieve accurate measurement of residual magnetism and synchronous demagnetization. The effectiveness of this method has been verified through residual magnetism measurement experiments on ring transformers and large converter transformers, and it can be applied in specific engineering practice operations. Theoretical analysis shows that the charging range of energy storage capacitors is affected by the hysteresis characteristics of the iron core and the saturation magnetic flux, and the residual magnetization value can be directly calculated based on the difference in the intersection point of the longitudinal axis of the demagnetization hysteresis loop. Simulation and experimental results show that the measurement error of the proposed method is less than 5%—significantly better than traditional methods. This method does not require complex control strategies, has high precision and efficiency, and can provide reliable technical support for residual magnetism detection and suppression of off-grid power transformers. |
| format | Article |
| id | doaj-art-562713e3baba4f08aa220276f8097ee6 |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-562713e3baba4f08aa220276f8097ee62025-08-20T01:56:20ZengMDPI AGApplied Sciences2076-34172025-05-011510537510.3390/app15105375Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis LoopDingyuan Li0Jing Zhou1Zhanlong Zhang2Yu Yang3Zijian Dong4Wenhao He5Xichen Pei6Jiatai Gao7Siyang Chen8Zhicheng Pan9National Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaNational Key Laboratory of Transmission and Transformation Equipment Technology, Chongqing University, Chongqing 400044, ChinaState Grid Chongqing Electric Power Company Qijiang Power Supply Branch, Chongqing 400044, ChinaChina Southern Power Grid Corporation Limited Ultra High Voltage Transmission Company Electric Power Research Institute, Guangzhou 510000, ChinaThe residual magnetism of the iron core of power transformers can cause an excitation inrush current, posing a threat to the safe and stable operation of the power grid. This paper proposes a transformer remanence measurement method based on a demagnetization hysteresis loop to address the problems of large errors, complex operation, and poor universality in existing remanence measurement methods. This method is designed for off-grid transformers to avoid potential interference to the power grid caused by current pulses during the measurement process. This method constructs an RLC oscillation circuit that utilizes capacitor energy storage and iron core magnetic field energy conversion, combined with the dynamic characteristics of hysteresis loops, to achieve accurate measurement of residual magnetism and synchronous demagnetization. The effectiveness of this method has been verified through residual magnetism measurement experiments on ring transformers and large converter transformers, and it can be applied in specific engineering practice operations. Theoretical analysis shows that the charging range of energy storage capacitors is affected by the hysteresis characteristics of the iron core and the saturation magnetic flux, and the residual magnetization value can be directly calculated based on the difference in the intersection point of the longitudinal axis of the demagnetization hysteresis loop. Simulation and experimental results show that the measurement error of the proposed method is less than 5%—significantly better than traditional methods. This method does not require complex control strategies, has high precision and efficiency, and can provide reliable technical support for residual magnetism detection and suppression of off-grid power transformers.https://www.mdpi.com/2076-3417/15/10/5375power transformerremanence measurementdegaussing hysteresis loopenergy storage capacitorsRLC oscillation circuit |
| spellingShingle | Dingyuan Li Jing Zhou Zhanlong Zhang Yu Yang Zijian Dong Wenhao He Xichen Pei Jiatai Gao Siyang Chen Zhicheng Pan Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop Applied Sciences power transformer remanence measurement degaussing hysteresis loop energy storage capacitors RLC oscillation circuit |
| title | Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop |
| title_full | Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop |
| title_fullStr | Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop |
| title_full_unstemmed | Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop |
| title_short | Research on the Remanence Measurement Method of Transformers Based on the Degaussing Hysteresis Loop |
| title_sort | research on the remanence measurement method of transformers based on the degaussing hysteresis loop |
| topic | power transformer remanence measurement degaussing hysteresis loop energy storage capacitors RLC oscillation circuit |
| url | https://www.mdpi.com/2076-3417/15/10/5375 |
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