Serial Failure Diagnosis of a Transmission Line Protection Relaying System by Petri Nets

摘要

With the development of large-scale complicated modern power systems, the requirement for the associatedprotection scheme tends to be more stringent and its combination more complex. However, it is very difficult to figureout the factors of failure of such systems. This paper proposes a Petri net model of a transmission line protectionrelaying system, including three types of relays as well as an automatic re-closing device, and shows how to diagnoseserial failure of the system by analyzing invariant sets of the model. Furthermore, it gives four basic types of failuresequences and its execution is much more intuitive and effective than the traditional method.