A Petri Net Model for Electrical Power Systems Operating Procedures

摘要

The operation and the maintenance of electric power systems are governed by a set of procedures required to ensure that any intervention on the system will be performed under safe conditions, considering the inherent dangers coming from the presence of live conductors, parts and components. Although the main safety-related concepts like energy isolation, earthing, interlocking and lockout-tagout are consolidated in electric power system practice, their translation in the procedures preparation process requires a deep analysis of electric network operation and maintenance requirements, components properties and topological characteristics. A formalization of the general rules and methods adopted in the preparation, control and actuation of electrical procedures has been proposed utilizing a Petri Net (PN) model representing the system and its state changes in graphical and analytical form. This allows us to better understand the logic behind a procedure and to allow an immediate consistency check of the correctness of the procedures' operating sequences.