Effectiveness assessment of selected graphical techniques for the interpretation of measured concentrations of gases dissolved in transformer oil

摘要

The article describes selected graphical methods (Duval triangle, Duval pentagon and Mansour pentagon), which may be used for the analysis of gases dissolved in oil of power transformers. The effectiveness of recognizing the basic types of defects by these methods was assessed. This is of significant importance for the services responsible for maintaining transformers in operation.