Fault diagnosis of substation system using 3/2 connection mode based on rough sets and Petri net
Gao Ao · Advanced Technology of Electrical Engineering and Energy · 2012
The 500kV and above transformer substation systems always select the 3/2 connection mode,and this mode has its own characteristics at the structure of main connection and the disposition of protection.Firstly,this paper establishes the initial decision table of fault diagnosis after analyzing trip strategies of protection about the 3/2 connection system.Then the paper proposes a fault diagnosis method based on rough set and Petri nets.This method has three parts:to calculate the reduced attribute set by the rough set theory;to construct the Petri net model based on the rules from the reduced attribute set;and to diagnose the fault through parallel reasoning of Petri nets.Finally,the paper gives some tests of the fault diagnosis.The results show that this method can diagnose the fault localization of 3/2 connection mode accurately and it is good at the diagnosis speed and the fault tolerance.