Simulation Of High Voltage Circuit Breaker System Modeling And

With China’s high-speed economic development, not only has the demand for electric power greatly increased, but the demand for a reliable electrical distribution and supply has to keep pace. As a high-voltage circuit breaker is vital for a grid’s normal operation, an intensive research to further its performance is necessary and beneficial for China.A high-voltage circuit breaker’s current interruption capacity depends both on its pneumatic performance and the dynamics of its mechanical system. Research institutes nowadays apply CAE simulation technologies, combined with theoretical analysis and experimental research, to improve notably the high-voltage circuit breaker’s performance. Most researches however do not address the interactions among the different energy fields inside the high-voltage circuit breaker. Instead of focusing on single parts, this paper’s main objective presents modeling and simulation of a mechanical, pneumatic and control signals coupling high-voltage circuit breaker system as a whole.A SF6live tank circuit breaker is studied in this paper. Its spring-operated mechanism, power transmission mechanism and interrupter chamber are firstly introduced, mainly on their structures and principles of operation. A circuit breaker’s system-level diagram is elaborated after an analysis of force interactions and power exchanges among the components. Because of the multi-energy interactions inside the equipment and the R&D procedure requirements, the software AMESim is highly recommended for this modeling and simulation.Both the opening and the closing part of the spring-operated mechanism are considered as a spring-operated crank-slider mechanism. After an integration of a cam system, an opening/closing latch and a control system, the whole model of this mechanism is obtained. The power transmission system is treated as a combination of two parallel four-bar linkages, which are in AMESim modeled with multi-port body components and pivots. The modeling of the interrupter chamber is done by linking its mechanical and pneumatic models together to be a piston system. All components are finally assembled in the global coordinate system to get a whole circuit breaker model.The dynamic contact phenomenon inside the mechanical command is discussed. Two kinds of contact possibilities, for instance, the non-conformal contact and the conformal contact, are analyzed using classical contact theories so as to get a reasonable method for defining contact parameters in AMESim models. A modeling method in AMESim for springs with a non-negligible proper mass is studied. A theoretical analysis of a spring’s dynamic state is done both in time-domain and frequency-domain. A discrete spring AMESim model is also simulated under the same conditions. The comparison of these two methods demonstrates the discrete spring model’s accuracy and efficiency.