Fault diagnosis of power system using relay protection setting values

This paper proposed a method for modelling of power system fault diagnosis process. In this process, electrical power system fault diagnosis needs three kinds of information to identify fault components: protection-breaker associations, breaker-primary component (such as line, transformer, bus and so on) associations and protection-primary component associations. Firstly, the protection setting values were compared with short circuit calculation values to determine the protecting zone. I.e. determine protection-primary component associations. Then the component connecting topology trees were used for creating the Petri Nets model of possible fault components. Finally according to Petri Nets model the true fault primary devices were identified. At the same time, the false tripping or operating information were picked out.