Hazards of interpretation of dissipation-factor tip-up determinations

Several contributions to the study of empirical correlation between tip-up and insulation life are reviewed, In addition to the published literature some previously unpublished field measurements made by the authors´ Company are cited. Some investigators report favorable correlation while others report the contrary. Our own experience on two different insulation systems indicates that the extent and the kind of correlation is dependent on the kind of insulation system which is being evaluated.