Transformer short-circuit impact resisting method and system based on winding inter-turn dynamic pre-tightening force self-adaptive adjustment

By collecting and analyzing the electrical and mechanical parameters of the transformer in real time, identifying short-circuit fault characteristics, assessing the mechanical state of the windings, and dynamically adjusting the preload, the problem of insufficient short-circuit withstand capability of the transformer is solved, and the stability of the windings and energy dissipation effect are achieved.

CN121960074AActive Publication Date: 2026-05-01NANJING ZHENGRUI POWER TECH CO LTD
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Patent Information

Application Number
CN202610433253.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-03
Publication Date
2026-05-01
Estimated Expiration
2046-04-03

AI Technical Summary

Technical Problem

Existing transformers have insufficient short-circuit withstand capability, the fixed preload cannot adapt to the aging of insulation materials, current amplitude-based control is difficult to cope with different fault modes, and the nonlinear hysteresis characteristics of the windings are ignored, leading to problems such as local overvoltage or undervoltage and structural resonance.

Method used

By collecting the electrical operating parameters and mechanical response parameters of the winding in real time, the characteristics of short-circuit faults are identified, the mechanical state of the winding is evaluated, the dynamic preload command is calculated using a preset control strategy, and the winding is applied with a hydraulic drive system to apply independent dynamic preload to the winding.

Benefits of technology

It realizes the real-time adjustment of the pre-tightening strategy based on short-circuit conditions and winding aging status, effectively suppressing winding vibration instability and improving the transformer's short-circuit withstand capability.

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Abstract

The invention discloses a transformer short circuit impact resisting method and system based on winding inter-turn dynamic pre-tightening force self-adaptive adjustment. The method comprises the following steps: dividing a winding into a plurality of regulation and control subareas along the axial direction, and acquiring electrical operation parameters and mechanical response parameters of each subarea in real time; identifying a short-circuit fault type by using a symmetric component method, and matching a stress distribution mode in combination with an offline calibration library; and meanwhile, based on a Bouc-Wen nonlinear model, the rigidity and damping states of the winding are identified on line. And with maximization of system energy dissipation as a target, an optimal pre-tightening force instruction of each partition is calculated by using a sequential quadratic programming algorithm, and dynamic pre-tightening force is applied to a winding through a hydraulic servo system with an energy accumulator. The pre-tightening strategy can be adjusted in real time according to the short-circuit working condition and the winding aging state, winding vibration instability is effectively restrained, and the anti-short-circuit capacity of the transformer is improved.
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