An empirical study on assessment method for aging medium & large oil-immersed power transformers

There has been fewer new hydraulic power plants being built in Korea, and the existing power equipment has gradually been aged. Understandably, older plants require more maintenance to keep up the system performance. An effective asset management of power equipment has become a great necessity from both economical and technical aspects. This paper investigated a Risk-Based Maintenance (RBM) method that consists of technical assessment and economical assessment to make an efficient reliability assessment.