Transformer Fault Diagnosis using Frequency Response Analysis - Practical Studies

Any failures in these equipments directly reduce network reliability and increase maintenance costs. Consequently, the preventive maintenance techniques are increasingly developed. In this regard, frequency response analysis is an appropriate method in order to diagnose any change which occurs in transformer physical construction. This contribution has been concentrated on fault diagnosis by use of Frequency Response Analysis (FRA). A number of measurements on faulty transformers which are led to fault diagnosis has represented and discussed. These practical studies are performed during maintenance processes or on site periodic inspections. The results are very worthwhile to better understand how behave transformer frequency responses due to various faults. These obtained results can be very interesting and usable for maintenance engineers to find the occurred fault.