Maintenance priorities in distribution transformers based on importance and risk

Maintenance of transformer is an activity which is done on non-defective transformers to reduce or eliminate the weak points. This is one of the main strategies in asset management. The aim of this work is to increase the useful life time of transformers and decrease their failure rates which will prevent their outages and troubleshoot problem. Over last years, many strategies have been presented for service and maintenance of distribution system components such as transformer. Which each of them depending on funding and liquidity of Distribution Company takes action about maintenance planning process. This paper, in addition of reviewing the existing methods in the service and maintenance of transformers, presents a new method which is based on distribution companies performance in Iran. In this method, determination of each transformer failure probability and priority is attempted for service and maintenance, according to available operation information.