Condition monitoring and diagnosis of power transformers

Power transformers are one of the most important components of electric networks. These devices are very expensive and therefore diagnosis and monitoring systems will be valuable for preventing damage to them. A facility for viewing the status of transformers remotely by experts who will make an appropriate decision in case of a problem is needed to prevent premature damage to the transformers. 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.