Study on power transformer fault diagnosis method based on fuzzy tree

Being one of the most important equipments for power transmission, the fault diagnosis and analysis of power transformer is the key to the security and reliability of power supplies. It leads to uncertainties and randomicity for the fault happening that the complicated structures of power transformers and its operating environment, and it is hard to accumulate the statistical information of fault events for the low occurring rate of power transformer fault. It is mentioned in this paper that the fault analysis for transformers with the method of fuzzy fault tree based on fuzzy theory, which turns the fault rate into fuzzy math fault rate and processes probability estimation on the fault using expert graded method without statistical information. The way of it changed into fuzzy math is expatiated and an applied example is also been offered. The result shows that the analysis method of fuzzy fault tree provided well agility and adaptability. Tt has highly value of engineering practicability in the field of transformer fault analysis and fault prevention.