## 8 Conclusions  
In this paper, a remanence measurement method based on the degaussing hysteresis loop is proposed, which uses the dynamic conversion of capacitive energy storage and core magnetic field energy to generate an attenuation oscillation current by constructing an RLC oscillation circuit composed of an energy storage capacitor and a transformer winding. It is crucial to emphasize that this method is intended for de-energized transformers to avoid any potential disturbance to the power grid. Not only does this method enable accurate measurement of remanence, but it also facilitates simultaneous degaussing operation. The theoretical analysis shows that the charging range of the energy storage capacitor can be calculated, and the remanence value can be directly calculated by the intersection point difference of the longitudinal axis of the dynamic hysteresis loop, which provides a new theoretical basis for the measurement of remanence. This method effectively solves the problems of large error, complex operation, and lack of versatility in the existing remanence measurement methods, and provides new ideas and theoretical support for the research on remanence detection and the suppression of de-energized power transformers. Through simulation and experimental verification, the method shows significant measurement accuracy and degaussing effects. The results show that the measurement error of the proposed method is less than 5%, and the remanence after degaussing is less than 3 Wb, which is significantly better than the traditional method. 1. Experiments show that the method does not require complex control strategies, and has both high precision and high efficiency. Under different set values, the error percentage can be kept at a low level, the remanence value of the starting point is close to the set value, and the remanence value of the endpoint is close to zero, which further proves the effectiveness and reliability of the method. This advantage makes the method highly feasible in practical engineering applications, which can meet the strict requirements of power systems for transformer remanence measurement and demagnetization and provides strong technical support for ensuring the safe and stable operation of the power grid. 2. This method has important value and significance in practical application. First of all, it is simple to operate, does not require complex control strategies, and reduces the technical requirements for operators and equipment costs. Secondly, the measurement accuracy is high, which can accurately detect the remanence of the transformer core, which provides reliable data support for the maintenance and overhaul of the transformer. Thirdly, the degaussing effect is remarkable, which can effectively eliminate remanence, reduce the harm of excitation inrush current to the transformer and power grid, and improve the stability and reliability of the power system. 3. In addition, this method is suitable for different types of transformers, has good versatility and adaptability, can meet the remanence measurement and demagnetization needs of various transformers in the power system, and provides strong technical support and a guarantee for the safe operation and maintenance of the power system. Conceptualization, D.L. and J.Z. ; methodology, Z.Z. and Y.Y. ; software, Z.D. and W.H. ; validation, D.L., J.Z. and Z.Z. ; formal analysis, D.L. ; investigation, Y.Y. and Z.D. ; resources, W.H. and X.P. ; data curation, J.G. ; writing--original draft preparation, D.L. ; writing--review and editing, J.Z. and Z.Z. ; visualization, S.C.; supervision, Z.P. ; project administration, D.L. ; funding acquisition, J.Z. ; theoretical formula derivation, D.L. and S.C.; experimental equipment and venue provided by Z.P. ; experimental data processing, Z.P. and S.C. All authors have read and agreed to the published version of the manuscript. This research was financed by the China Southern Power Grid Program (CGYKJXM20220310). Not applicable.