RCM Application for Availability Improvement of Gas Turbines Used in Combined Cycle Power Stations

IEEE Latin America Transactions (Impact Factor: 0.33). 10/2008; 6(5):401 - 407. DOI: 10.1109/TLA.2008.4839109
Source: IEEE Xplore


This paper presents a reliability-based method aiming to improve the availability of gas turbine installed in combined-cycle thermoelectric power plant. The importance of the gas turbine is related with the power plant operational principle. The gas turbine transforms the chemical energy generated by combustion in mechanical energy to rotate the generator's shaft. The exhaust gas is used to heat water in the steam generator, which is part of the steam cycle. The failure of the gas turbine causes the power plant unavailability. The method presented is based on the Reliability Centered Maintenance (RCM) concepts. The method first step requires the development of the Failure Mode and Effects Analysis (FMEA) of the turbine components to define the most critical items for turbine operation. This criticality is based on the evaluation of the component failure effect on the turbine operation. Once the critical items are defined a maintenance policy can be proposed for those components, considering the Reliability Centered Maintenance (RCM) concepts, aiming to improve the equipment availability. The reliability of the turbine is calculated based on the failure data records. Considering the time to repair data and the preventive maintenance tasks associated with the equipment, the gas turbine availability is evaluated. The analysis not only allows the evaluation of the actual maintenance policy but also allows the prediction of possible availability improvement taking in view the application of new maintenance procedures, based on RCM concepts.

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    • "Interests in RCM in electrical engineering arose in the 1980s in the wake of its successful deployment in the aircraft and aerospace industry in the 1960s [4]. More achievements in RCM applications have been reported in the nuclear industry [5], chemical industry [6], and process/oil and gas [7]. In the literature focused on RCM in the power electric industry, some publications have described analyses on the high-voltage (HV) [8]–[10] and medium-voltage (MV) [11] facilities. "
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    ABSTRACT: Although reliability-centered maintenance (RCM) has proven its noticeable merits in many industries, has not been yet furnished with efficient analytical methods in the power engineering context. The first of this two-paper set presents a practical framework by which the RCM procedure can be implemented in power distribution systems. The proposed algorithm consists of three main stages. The prerequisites of the analysis are outlined in the first stage. In the second stage, an approach is developed to identify the network's critical components, from the reliability point of view. Having practically modeled the components' failure rates, an efficient cost/benefit evaluation approach is then proposed to distinguish a variety of maintenance plans. The optimal set of maintenance strategies is next adopted for implementation. The algorithm is terminated in the third stage by recording both technical and economical outcomes for tuning the forward maintenance activities. The proposed methodology, although tailored to distribution networks, is generic enough to be applied to other power system areas. In the companion paper, the proposed methodology is examined by application to the Birka distribution system of Stockholm City, Sweden, and more practical aspects are discussed.
    IEEE Transactions on Power Delivery 12/2012; 28(2). DOI:10.1109/TPWRD.2012.2227832 · 1.73 Impact Factor
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    • "Similarly, maintenance policy in underground networks including cable systems as its main component is studied in [10]. Recent studies have been conducted in RCM process of overhead lines [11], gas turbine units [12], power and industrial transformers [13], [14], and medium voltage (MV) circuit breakers [15]. "
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    ABSTRACT: Confronted with the power system restructuring trend reforming the past-regulated power systems, the need for a narrower insight on the costly maintenance strategies seems imperative. It falls within the realm of reliability centered maintenance to enhance the cost effectiveness of power distribution maintenance policies. From a practical point of view, this paper devises a novel approach on the basis of the analytical hierarchical process (AHP) accompanied by fuzzy sets theory to determine the most critical component types of distribution power systems to be prioritized in maintenance scheduling. In the presence of many qualitative and quantitative attributes, fuzzy sets can effectively help to deal with the existent uncertainty and judgment vagueness. As demonstrated in a practical case study, the proposed fuzzy AHP method introduces its applicability and efficiency in the asset management procedure.
    IEEE Systems Journal 12/2012; 6(4):593-602. DOI:10.1109/JSYST.2011.2177134 · 1.98 Impact Factor
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    ABSTRACT: An approach to link maintenance and replacement decisions is presented in this paper. This approach proposes a methodical decision-making system to determine the optimal time to replace equipment. It essentially investigates the cost-effectiveness of replacing the equipment both before and after the lifetime is extended by maintenance. To properly investigate the effect of maintenance, maintenance activities should first be scheduled effectively. Therefore, this approach introduces a maintenance strategy based on reliability-centered maintenance (RCM) concept and genetic algorithm (GA) to optimally schedule maintenance activities. Two replacement studies are conducted: with and without the effect of maintenance. A comparison between replacement studies is discussed in the proposed approach. The proposed approach is applied to one of the most critical pieces of equipment in power systems: power transformer.
    IEEE Transactions on Power Delivery 08/2014; 29(4):1603-1612. DOI:10.1109/TPWRD.2014.2321409 · 1.73 Impact Factor


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