Analysis on Workability of Maintenance of Transmission Assets: A case study from Java-Bali Transmission Grid

The increasing number of transmission assets needs attention in terms of maintenance so that the life cycle cost of assets can be optimized. In this research objects, the highest percentage of power transformer bay maintenance was 80.85% while the lowest was 77.78%. This shows the workability of maintaining the power transformer bay has not yet been implemented 100% both in terms of the population of transformer units that must be maintained and the work items carried out. This paper evaluated the workability of the maintenance of power transformer bays referring to the standard that is used based on historical records of maintenance data and other documents related. It was found that the obstacles in implementing maintenance on transformer bays were the condition of the electric power system, the design of equipment and substations, the availability of maintenance equipment, the competency and availability of personnel, the customer’s affairs conditions, and the schedule including the weather condition. Then, proposed improvements that can be made to improve the workability of power transformer maintenance are recalculation of the defensive scheme at the time of planned maintenance work, evaluation of the equipment and substation design that makes difficulties in the maintenance, defining a pattern of maintenance and calibration of testing equipment, assessment of maintenance personnel as a reference for mapping competencies and the number of human resources, form a special task force to adjust customer conditions or makeshift schedules to do emergencies work and do online condition monitoring, and considering the weather forecast periodically.