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Analysis and Control of Magnetizing Switching Inrush in Power Transformer

S. Das(1*), T. K. Bhattacharya(2), D. Prasad(3), S. Sengupta(4)

(1) Department of Electrical Engg., National Institute of Technology, India
(2) Department of Electrical Engg., Indian Institute of Technology, India
(3) Emerson Network Power (India) Limited, India
(4) Department of Electrical Engg., Indian Institute of Technology, India
(*) Corresponding author


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Abstract


Power transformer is one of the key components of power systems. Transient free operation of the same enhances the overall system efficiency. Magnetizing current inrush is one of the major problems during switching operation. In this paper, an equivalent circuit model is presented to analyze this transient phenomenon. This model predicts the remnant levels, extent of inrush for both arbitrary and controlled re-energization. In this paper, a controller circuit is also presented which estimates the last remnant and utilizing this data, it controls the next re-energization instant to achieve inrush-free switching.
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Keywords


Inrush; Remnant; Prospective Flux; Sequential Energization; Controlled Switching

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References


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