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Based on the analysis of the principle of residual current device (ReO), the impact of sensitivity and unbalance response on the characteristics of residual current transformer (ReT) are discussed in detail. And a kind of ReT is designed by using analytical calculation and numerical simulation methods. Finally, a kind of ReD is developed in this paper.Experimental results show that the designed ReO is of good performance, thus the feasibility of the design is verified.

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The analysis of current transfer characteristics of hybrid DC circuit breakers is of great significance for improving their breaking capacity and implementing control strategies. This paper analyzes the principle of hybrid DC circuit breakers. The hybrid circuit breaker simulation model is built based on the Mayr arc model in Matlab/Simulink using IGBT, RCD snubber circuit and arrester model. The current simulation waveforms under different external circuit parameters and transfer branch parameters with a voltage of 400V and breaking fault current less than 200A are mainly studied. Through the analysis of the current transfer characteristics, a series of theoretically supported breaking characteristics are obtained, which provide a reasonable and effective reference for the fast and reliable breaking of DC micro-grid hybrid circuit breaker.

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