Condition monitoring and diagnosis of power transformers

Power transformers are important components of all electric networks. They are usually very expensive and therefore diagnosis and monitoring systems will be valuable for preventing damages. A continuous control of the status of the transformer condition is worthwhile and will support the appropriate decision in case of a problem. The transformers are geographically spread and with the aid of Internet, it is possible to collect appropriate information from these transformers to a central node for diagnostic purposes under the supervision of high voltage engineering experts. The aim of this paper is to show the main problems related to power transformers and to review mitigation methods for the monitoring and diagnosis of power transformers.