Abstract
This paper shows the calculation of SLF interrupting performance for serially connected two Mayr-type arc models with different arc parameters by using EMTP-ATPModels. The arc model 1, assuming an air circuit breaker, has large arc time constant and large arc power loss. The arc model 2, assuming a vacuum circuit breaker, has small arc time constant and small arc power loss. The arc model 1 was impossible to interrupt 300kV-63kA-90% SLF by itself. However, by connecting thesearc models in series, it became successful in the interruption, even if the arc model 2 was reignited at low voltage at a few μs after current zero. These computations suggested that the serial connection of the two circuit breakers with different breaking characteristics would give a totally excellent circuit breaker by making the best use of advantages of each circuit breaker. EMTP-ATP Models was very useful to solve the arc models which are expressed by differential equations and coupled with the electric circuit.
