The Present Status of Maintenance Strategies and the Impact of Maintenance on Reliability

Abstract

Abstract-In this paper, the most frequently used maintenance strategies are reviewed. Distinction is made between strategies where maintenance consists of replacement by a new (or "good as new") component and where it is represented by a less costly activity resulting in a limited improvement of the component's condition. Methods are also divided into categories where maintenance is performed at fixed intervals and where it is carried out as needed. A further distinction is made between heuristic methods and those based on mathematical models; the models themselves can be deterministic or probabilistic.From a review of present maintenance policies in electric utilities it is concluded that maintenance at fixed intervals is the most frequently used approach, often augmented by additional corrections. Newer "as needed"-type methods, such as reliability-centered maintenance (RCM), are increasingly considered for application in North America, but methods based on mathematical models are hardly ever used or even considered. Yet only mathematical approaches where component deterioration and condition improvement by maintenance are quantitatively linked can determine the effect of maintenance on reliability. Although more complex, probabilistic models have advantages over deterministic ones: they are capable of describing actual processes more realistically, and also facilitate optimization for maximal reliability or minimal costs.

Research and Application of Birth-death of Equipment in Overhaul Plan for Distribution Grid

“…So the implementation of maintenance can be divided into two situations, one is to proceed as preplanned, and the other to regularly monitor the system for the purpose of making sure that the overhaul and its content are being conducted. According to literature [3], the additional states M1-M3 may be introduced in overhaul process, as shown in Figure 2. In this figure, it assumes that the overhaul will generally improve the system to the previous degradation state.…”

“…In its long-time running, the health condition will be worsen due to various factors. And the overhaul aims at ensuring the normal operation of power grid by extension of service life using particular measures or at least by delaying the moment of occurrence of the next failure [2,3]. However, in fact, insufficient or frequent overhaul will always occur.…”

Utilização de computação móvel para qualificação de rotinas de operação e manutenção de redes de distribuição

“…A manutenção de um sistema elétrico é fator essencial na produtividade e competitividade das empresas de energia elé-trica, uma vez que a qualidade e a continuidade são diretaFigura 15: Arquitetura lógica do sistema de inspeção de redes mente influenciadas pelo desempenho dos equipamentos da rede (Endrenyi et al, 2001). A tarefa de inspeção de redes é uma área promissora para a utilização de computadores móveis.…”

Encompassing Electricity Market Predictions and Weather Forecasts in Power Plan O&M Strategies

“…The criteria based on economic cost or based on reliability are the most employed for O&M problem [49,50]. The most common economic objective is to minimize the costs of energy production and maintenance, i.e.…”