The need for using various interpretation methods for power transformer DGA results

The method of analysis of gases dissolved in oil belongs to one of the most informative methods of early detection of defects in power oil-filled transformers. The purpose of this study is to substantiate the need for the use of various methods of interpretation of the results of gas chromatographic analysis of the oil of power transformers. The following methods for dissolved gas analysis have been reviewed: Rogers Ratio Method, IEC 60599 Standard Method, Doernenburg Ratio Method, Duval Triangle Method, ETRA method, as well as the RD 153-34.0-46.302-00 method adopted in the Russian Federation. These methods are implemented in various power companies of the Russian Federation, such as PJSC Rosseti MR, PJSC FGC UES and PJSC Mosenergo. The article reveals the need to take into account the totality of all available techniques, based on RD 153-34.0-46.302-00, and the formation of training samples.