Multiobjective Optimization of Key Parameters for the Chamber of Low-Voltage DC Circuit Breakers Based on MHD

The extinguishing performance of low-voltage dc circuit breakers is intricately influenced by the arc motion process, which in turn is shaped by the structure of the arc chamber. Consequently, optimizing and refining the arc chamber structure is imperative for augmenting arc-extinguishing efficacy. Addressing this necessity, this study presents an advanced multiobjective optimization algorithm grounded in the magnetohydrodynamic (MHD) model for low-voltage dc circuit breakers. The optimization targets key geometrical parameters within the chamber, encompassing the arc runner length, splitter plate inclination angle, as well as the horizontal and vertical spacing between neighboring splitter plates, to minimize both arc energy and overvoltage. Relative coefficients for primary and secondary objectives are seamlessly integrated into the optimization process to bolster computational efficiency. Leveraging simulation models, this algorithm expeditiously explores the impact of various arc chamber structural parameters on arc motion, thereby furnishing invaluable insights for designing and optimizing low-voltage circuit breakers.