Critical index analysis for improvement maintenance ranking of PEA’s overhead distribution system
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Abstract
The Provincial Electricity Authority (PEA) has significantly large electrical networks, especially medium voltage overhead lines, which have been installed and utilized for a long period of time. As a result, the deterioration of electrical equipment and the damaged components can occur. In order to reduce the interruption of service, PEA has planned the budget allocation for the improvement maintenance in order to be efficient for the budget allocation. The research proposes the evaluation of the critical index by risk analysis using inspection data, which comprises two sub-indices 1) the inherent risk of the power system, and 2) the condition of the power system. The benefit-cost ratio (B/C ratio) of the maintenance project was obtained for the economic assessment. The improvement maintenance project solely considered in this research was changing bare conductors in medium voltage overhead systems to insulated conductors because this project can reduce most outage causes and has the largest budget. Based on the experimental results obtained from 35 overhead distribution circuits of the PEA, the study revealed the ability to identify critical levels of the distribution system ranging from level 1-5 (level 5 representing distribution systems with the highest risk of electrical disruption). It demonstrated the investment's value, which can be utilized to enhance maintenance efficiency, effectively identify the critical levels within the distribution system, and assess the B/C ratio of the project. These insights serve as a valuable tool for optimizing the efficiency of improvement maintenance while supporting decision-making for conductor replacement budget allocation.
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