Abstract
High speed breaker is one of the research hotspots in the field of DC Large current power system in recent years, its core function is to realize low temperature rise path connection and sub-millisecond short circuit protection. In a power system with several thousand amperes of steady flow, the on-state low temperature rise is an important basic performance of the highspeed breaker, especially for the temperature rise at the cavity directly affects the service life of the explosive and has a great influence on the engineering practicability of the high-speed breaker. In order to solve the problem of on-state temperature rise of the high-speed interrupter, this paper establishes an electrothermal coupling mathematical model with conductive and insulated conductive components. ANSYS - multi physics is used to numerically solve the model, the influence of heat sources such as contact resistance and bridge resistance on the temperature rise is analyzed, the influence law of convection heat transfer coefficient on the temperature rise is discussed, the influence law of the area, thickness and thermal conductivity of the thermal insulation layer on the temperature rise of the cavity is emphatically discussed. A prototype of the high-speed breaker was developed, by comparing and analyzing the 3 kA through-flow temperature rise calculation and measured data, it was found that the error was within the allowable range of the project, thus proving the correctness of the mathematical model and theoretical analysis. A high-speed breaker solution with an overall resistance of only 13.3µΩ, a temperature rise of 30k for the terminal copper bar, and a temperature rise of 40k for the cavity was obtained, which effectively solved the engineering problems of the target power system.
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