Research on Fault Diagnosis for Oil-immersed Transformer Based on Grey Degree Close

A new method named grey relation close degree using the grey system theory and the definition of the distance of two points is brought up. The fault models are ascertained according to the close degree among the fault symptom sets and the fault model sets. At last, the model is successfully used in fault diagnosis of oil-immersed transformer. The practical application results show the effectiveness of the proposed approach. It is proved that the method is concise, useful and reliable.