Research on Missing Code in Three Ratio Method Based on Grey Relational Analysis

Abstract

The three ratio method in dissolved gas analysis is a widely used method for transformer fault diagnosis, but the “000†and “011†code does not give its corresponding fault types. Since the missing data research is a small sample problem, it cannot be solved by traditional statistical and probabilistic laws. Therefore, grey relational analysis is introduced into grey system theory to study it. Research shows that the fault corresponding to the “000†code may be one of partial discharge or high temperature overheating, and the fault corresponding to the “011†code may be one of partial discharge, high energy discharge, low temperature overheating and high temperature overheating. By using grey relational analysis, the fault types of two missing codes can be further distinguished.