Circuit breaker model for digital simulation based on Mayr´s and Cassie´s differential arc equations

A model of a circuit breaker for digital simulation programs based on the Mayr´s and Cassie´s differential arc equations was developed. The model can be used to determine the current interruption capability of the circuit breaker. The theoretical basis and the structure of the model are described. The model is verified on a sample of measured results, and the use of the model for practical application is demonstrated. Although the validation of the model is limited to the vicinity of current zero, it can be usefully used. Its advantage lies in the fact that the simulation programs set and solve the system of breaker and network differential equations. Calculation of a breaker capability can so be done using a complex network.