Dissolved gas analysis (DGA) of partial discharge fault in bio-degradable transformer insulation oil

Bio-degradable oil was commercially introduced as transformer insulation oil in 1999. Since then, the usage of this oil in the power industry has steadily increased and a lot of researches have been in progress to make bio-degradable oil as compatible as mineral oil. This paper presents results of experimental tests performed on laboratory models of transformer windings immersed in bio-degradable oil. The experiment involved an investigation of hydro-carbon gas products generated by partial discharge fault. The aim is to determine whether existing analysis techniques on partial discharge faults using DGA fault interpretation methods which were developed for mineral oil have to be modified when applied to insulation assessment of bio-degradable oil.