<![CDATA[Maintenance management is a critical technical and managerial approach to ensuring the reliability and sustainability of electrical power distribution systems, particularly through effective transformer oil maintenance. Transformer oil performs dual functions as an electrical insulating medium and a cooling agent; therefore, its degradation can significantly reduce transformer performance and operational reliability. This study analyzes the implementation of transformer oil maintenance management in distribution transformers within an electrical power distribution system using a field research approach with a descriptive–evaluative design. Data were collected through structured interviews, direct field observations, and a review of technical maintenance documents. The analysis focuses on the physical, chemical, and electrical characteristics of transformer oil, as well as the maintenance strategies applied, including preventive maintenance, corrective actions, and scheduled oil replacement. The results indicate that a structured transformer oil maintenance management framework contributes to maintaining transformer reliability, supporting continuous system operation, minimizing operational risks, and extending the economic service life of distribution transformers. These findings underscore the importance of condition-oriented maintenance management as an integral component of asset management in electrical power distribution systems.]]>
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