Residual magnetism often remains in large power transformers after opening due to hysteresis effect

which not only risks damaging transformers via inrush current but also threatens power grid stability. Although existing elimination methods have mitigated this issue to some extent

they suffer from limitations like complex operation

long processing time

and limited effectiveness. To address these drawbacks

this paper proposes a novel fast residual magnetism elimination method based on energy storage oscillation. First

key capacitor parameters are determined via theoretical analysis. Then

simulation and experimental verification are conducted on power transformers of different voltage levels. Results show that by leveraging energy exchange in the oscillation process

the method achieves "adaptive" matching between demagnetization excitation and core parameters

enabling rapid and efficient residual magnetism elimination. Specifically

its demagnetization time is only minute-level

cutting time consumption by over 90% versus traditional methods; comparing post-demagnetization no-load current shows its effect is improved by more than 20%. These results confirm the proposed method outperforms traditional technologies in both effect and speed. In practical applications

it features rapidity

reliability

and high efficiency

providing strong technical support for safe transformer operation and power grid stability improvement.