Research on System Simulation of Interrupter and Operating Mechanism in High-Voltage Circuit Breaker with Continuous Sequence

The breaking performance of a high-voltage circuit breaker is determined by the combination of the interrupter, which extinguishes an arc plasma, and the operating mechanism, which controls movable part of the interrupter. To enhance the breaking performance of circuit breakers, it is essential to consider continuous operations such as Close-Open and Open-Close-Open sequences in specific duty calculations. A system simulation method that numerically solves internal phenomena using simplified governing equations for each component in high-voltage circuit breakers offers computational cost advantages over computational fluid dynamics (CFD) analysis. Integrating system simulation models for both the interrupter and the operating mechanism enables comprehensive analysis of the circuit breaker's performance. The accuracy of system simulation model was validated by comparing it with CFD analysis results. We utilized a simplified damper model for the operating mechanism and valve modeling in the interrupter to enhance convergence and accuracy in predicting the travel curve and its effect. The analysis of pressure in the thermal chamber during operations such as Close-Open and Open-Close-Open with high breaking currents such as SLF L90, showed an error margin within 5% compared to CFD simulations.