Processing by Logic Programming of Circuit-Breaker and Protective-Relaying Information

This paper develops in a general fashion a logical procedure that analyzes circuit-breaker and protective-relaying operations in a power system. The purpose of the analysis, referred to as Automatic System Trouble Analysis (ASTA), is to derive an up-to- date picture of the power-system network and to obtain a realistic diagnosis of a case of system trouble. The ASTA procedure is characterized by a flexibility in its approach to accommodate design or operating changes with minimum logic modification. The logic statements are simple, requiring a minimum of relaying information inputs. Although the ASTA procedure is intended for future implementation by a process computer at a system control center, it may be programmed for a time-sharing computer for earlier use by the system dispatcher. In fact, the ASTA logic may be applied without the aid of a computer.