Transformer anti-short-circuit capability dynamic checking method and system based on transient-time variation

By constructing digital twin models and multi-axis degradation models, the problems of information silos and single risk in transformer short-circuit withstand capability assessment have been solved, realizing dynamic and hierarchical assessment of transformer short-circuit withstand capability, and improving the accuracy of assessment and the scientific nature of operation and maintenance decisions.

CN121809134APending Publication Date: 2026-04-07ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID JIBEI ELECTRIC POWER CO LTD +1
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Patent Information

Application Number
CN202511844880.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-09
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing transformer short-circuit withstand capability assessment technologies suffer from problems such as information silos, single risk dimensions, and lack of comprehensive risk quantification, leading to inaccurate assessments and weak support capabilities for operation and maintenance decisions.

Method used

A dynamic verification method for transformer short-circuit withstand capability based on transient-time-varying conditions is constructed. Transient electromagnetic force and dynamic deformation simulation are performed through digital twin model, and the long-term evolution process is quantified by combining multi-axis degradation model. A four-quadrant risk assessment matrix is ​​constructed for comprehensive risk quantification.

Benefits of technology

It enables dynamic and hierarchical assessment of transformer short-circuit withstand capability, improving the accuracy of assessment and the scientific nature of operation and maintenance decisions, thereby enhancing the safety of the power grid and the level of lean asset management.

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Abstract

The invention discloses a transient-time varying-based transformer anti-short circuit capability dynamic checking method and system. According to the method, a high-fidelity digital twinborn model is established by constructing a four-layer database comprising a foundation, a material, a structure and operation parameters. And performing transient electromagnetic-structure coupling simulation by using the reconstructed real short-circuit current waveform driving model to obtain transient electromagnetic force, dynamic deformation and stress distribution prediction results under short-circuit impact. Meanwhile, a multi-axis degradation model covering mechanical, electrical and thermal dimensions is constructed, long-term evolution of equipment is quantified, conventional working conditions are converted into equivalent short-circuit impact times, and a comprehensive capability index is calculated. Finally, the transient impact risk and the long-term degradation degree are coupled, a four-quadrant risk assessment matrix is constructed, a comprehensive risk quantitative index is calculated, and dynamic grading and accurate positioning of the overall risk state of the transformer are achieved. According to the method, the problems of isolated island and single risk dimension of traditional static check information are solved.
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