Infrared Thermography, as applied to substation equipment, overhead lines and pole-top mounted equipment, provides an invaluable predictive and preventativ maintenance tool. The ability of infrared to provide early detection of faults allows the scheduling of repair work, during normal working hours, to be completed prior to extensive damage occurring. Since the work is prescheduled, the repairs are accomplished in a shorter time span and the materials replaced are less extensive. Therefore, power outages, down times, repair material and man hours spent on emergency repairs are significantly reduced, thereby reducing the overall maintenance program costs. This paper will focus on the application of Infrared Thermography to inspect transformers and will describe the survey techniques applied.