Quality control can suppress or reduce the volume of errors and repairs in the future where it can also minimize costs incurred by the company if later there is damage. These activities must be carried out carefully and effectively so that the results obtained are in accordance with the initial objectives. In fact, the implementation of equipment quality control activities in the field at PT. Indonesia Comnets Plus SBU Regional Sumbagsel is still done manually so it is not practical and takes a lot of time. This research is a design science research (DSR) by making a decision support system to help determine the quality of equipment in the field and determine the level of urgency for repairs to the tower that suffered the most damage using the Multi-Objective Optimization On The Basis Of Ratio Analysis (MOORA) Method. The accuracy results obtained in the implementation of this method are 100%
Interbus Transformer (IBT) plays important role in the reliability of power system interconnecting two different voltage levels thus enable the power interchange. Failure in the IBTs' bushings, will instantly lead to the power interruption and outage. Normally, IBTs are constructed of three windings with primary and secondary in wye and the tertiary in delta. The primary and secondary are loaded, with tertiary mostly unloaded and provide the isolating system due to the unbalance from the other two windings. Operating bushings above the nominal voltage tends to reduce the operating cycle. Displacement of absolute reference from phase to phase voltage thus will raise the applied voltage exceeds the nominal voltage. Theoretically, applying operating voltage of 1.571 x U 0 to the tertiary bushing continuously is likely to reduce the life time of bushing to approximately 2.5 years. Online monitoring technique is introduced to monitor the changes in the bushings due to the degradation of insulation quality. Literature study focusing on the ideal condition of a bushing against the real loading cycle in operation also considered to estimate the insulation degradation mechanism. This study put more efforts in analyzing the bushing condition as the function of loading pattern and the applied voltage. Bushing online monitoring data are attached as well to describe the occurrences inside the bushing. At the end of this study, options on the protection scheme are described with fault analysis.
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