تحليل فرورزونانس در ترانسفورماتورهاي قدرت كوره قوس الكتريكي و ارائه راهكار براي كاهش آن

Analysis of ferroresonance in electric arc furnace power transformers an‎d providing a solution for its mitigation

مهندسي برق

Ferroresonance is a dangerous phenomenon in power systems, especially in industrial networks equipped with long cables an‎d transformers with nonlinear magnetic characteristics, which can leads to severe overvoltages an‎d serious damage to equipment. In this research, the 69-kV power network of a steel plant is investigated, where an asymmetric switching operation of a vacuum circuit breaker an‎d the unintended remaining of one phase in the closed position caused the occurrence of ferroresonance in the furnace transformer.To analyze this phenomenon, an accurate model of the studied network was implemented in the ATP software, an‎d the transient behavior of the system under the actual fault conditions was simulated. The results show that the transformer terminal voltage increases significantly an‎d enters a stable ferroresonance operating region.To suppress this condition, the design an‎d application of a damping RC filter are proposed as an effective mitigation solution. The optimal values of the resistor an‎d capacitor were determined using a combination of theoretical analysis an‎d simulation-based optimization. The application of the RC filter demonstrates that the ferroresonant oscillations are damped an‎d the system voltage returns to its nominal value. The results of this study confirm that the RC filter is a simple, effective, an‎d practically applicable solution for mitigating ferroresonance in industrial distribution systems an‎d can play an important role in improving the reliability of distribution network.

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