Abstract
The paper deals with the reliability-centered maintenance (RCM) of a transmission substation. The process of the planning and actual performance of maintenance was carried out using an optimization algorithm. This maintenance procedure represents the maintenance management and included reliability of the power system operation, maintenance costs, and associated risks. The originality of the paper lies in the integrated treatment of all maintenance processes that are included in the pre-processing and used in the optimization process for reliability-centered maintenance. The optimization algorithm of transmission substation maintenance was tested in practice on the equipment and components of an existing 400/110–220/110 kV substation in the Slovenian electricity transmission system. A comparison analysis was also carried out of the past time-based maintenance (TBM) and the new reliability-centered maintenance (RCM), on the basis of the optimization algorithm.
Highlights
Maintenance is a combination of technical, administrative, and managerial actions during the lifetime of a device, the purpose of which is to keep it in, or bring it back to, the condition that enables performing of its functions
The elements of the electric power system (EPS) represent a set of elements Sel = {elk; 1 ≤ k ≤ nel; k ∈ N}, where nel is the number of elements in the entire EPS, el is the element in the EPS, and k is the counter of the EPS elements
A large number of companies are gradually introducing condition-based maintenance (CBM). An upgrade of such maintenance system is reliability-centered maintenance (RCM), wherein the frequency of maintenance interventions is defined with regard to the state and importance of the EPS element
Summary
Maintenance is a combination of technical, administrative, and managerial actions during the lifetime of a device, the purpose of which is to keep it in, or bring it back to, the condition that enables performing of its functions. The maintenance processes can be influenced by computation of the importance and technical condition of EPS elements, which is based on historical data of operation, events, and monitoring of EPS elements’ technical condition This represents the main hypothesis of this article. The optimization process that uses all possible data on historical events of operation and maintenance costs yields the results that can be used to manage the maintenance processes in the future This represents the main originality of this paper. The significant states in the system are determined on the basis of EPS operation data that include generation, nodal loads, and load flows between the nodes Their inclusion in the optimization process enables that maintenance activities are performed in the most suitable significant state.
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