Abstract:

The most important characteristic of a circuit breaker is its ability to turn on and off short-circuit current.In order to improve the breaking performance and reduce the electric power and thermal effects of short-circuit current on other electrical equipment in the power grid,the circuit breaker often has current-limiting performance,and the short-circuit current is limited by rapidly increasing arc voltage.By designing the structure of the loop electric force (Lorentz force) to achieve current limiting,the various structures are analyzed and designed to provide new design ideas for the domestic manufacturers.

Key words: short-circuit current, current limiting performance, loop electric force, arc voltage, structure design