Inrush Current Reduction by a Point-on-wave Energization Strategy and Sequential Phase Shifting in Three-Phase Transformer

Document Type : Original Article

Authors

1 Department of Electrical Engineering, Faculty of Sciences and Applied Sciences, University of Bouira, Bouira, Algeria

2 Department of Electrical Engineering, Faculty of Technology, University of Sétif-1, Sétif, Algeria

Abstract

The main goal of this work is the mitigation of inrush current in a three-phase transformer. This inrush current appears when energizing a no-load or lightly loaded transformer. It can reach very high values and can cause failures in the electrical system. The control strategy is achieved by considering the value of the residual flux when the transformer is de-energized as well as by respecting the phase shifting between the three phases. To measure the inrush current, an experimental configuration with a data acquisition system using dSPACE 1104 card was developed and is presented in this paper. A technique to control the circuit breaker for energizing a 2 kVA three-phase transformer without the appearance of inrush current was also tested and applied in the experimental setup. The specific contribution of this work is that this technique is applied in the measurements with a thorough investigation of the residual flux. The proposed technique achieved complete elimination of the inrush current.

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Main Subjects

References

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International Journal of Engineering
Volume 35, Issue 12
TRANSACTIONS C: Aspects
December 2022
Pages 2321-2328

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