Modeling of protective devices for voltage sag studies in distribution systems

Characteristics of voltage sags caused by faults in transmission and distribution networks depend on the protection system performance. This paper presents the development of a library of protective devices for voltage sag studies in distribution networks using an electromagnetic transients program. The document has been divided into two parts; the first one describes the implementation of protective devices (fuses, circuit breakers, reclosers), while the second part presents some simulation results whose main goal is to analyze the coordination between different types of protective devices.