EVALUATION OF TRANSFORMER RELIABILITY DATA BASED ON NATIONAL AND UTILITY STATISTICS

Abstract

Statistics about failures of power transformers c onstitute an important basis for asset management o f a fleet of transformers. Periodic review of failures statis tics becomes necessary where they can be used to in fluence transformer design and technology, maintenance and condition monitoring practices with changing system loading, operation and network configuration. This paper pro vides the process of statistical data acquisition a nd evaluation based on the German failure statistics and the results of an investigation of failed transformer units in So uth Africa, demonstrating the level of insight a detailed failu re study can provide into the performance of a larg e transformer fleet.