Effect of temperature on burst phenomena in aged mineral oil under non-uniform fields

This paper presents the experimental results of high field conduction current burst phenomena in aged transformer oil using point-plane configuration. The effect of temperature and field strength variations on burst parameters are emphasized. It was found that bursts can be classified according to their direction. Generally, the amplitude of bursts increases with the increase in temperature, up to a certain value, after which the trend reverses. The total number of bursts per minute peaks at about 60–70° C. This observation suggests that bursts may be attributed to the electrode-film-liquid interface and not to micro bubble mechanisms.