Extension diagnosis method of power transformer faults based on matter-element model

In order to enhance the diagnosis ability of the conventional dissolved gas analysis (DGA), this paper proposes a extension diagnosis method for the power transformer fault diagnosis. Firstly, based on matter-element theory in extension theory, a matter-element model is established for qualitatively describing the fault diagnosis problem of power transformer. Secondly, this paper quantitatively calculates the degree of relation of tested power transformer with the faulted characteristic using the extended relation functions. Finally, the effectiveness of this method is proved by 195 fault diagnosis examples of power transformers. The results show that the extension diagnosis method can overcome the drawbacks of the IEC method that cannot diagnose multi-fault and no matching codes for diagnosis. Moreover, it provides high correct diagnosis rate.