The paper deals with the comparison between the overall whole-of-life costs of overhead lines (OHL) and those of underground insulated cables (UGC). Almost all the investigations published so far, when analysing maintainability issues, take into account only the costs of planned periodical maintenance; here, a method for assessing also the expenses sustained for repair after random failures is proposed. The number of random failure events for each kind of component over the whole service life of a transmission line can only be predicted on probabilistic basis: its expected value is estimated by making use of the mean values of relevant failure rates from recent statistical surveys. The whole procedure is shown by carrying out a particular case study as an example; nonetheless, the method may be widely applied to any type of OHL-UGC comparison.
Overall cost comparison between cable and overhead lines including the costs for repair after random failures
BENATO, ROBERTO;
2011
Abstract
The paper deals with the comparison between the overall whole-of-life costs of overhead lines (OHL) and those of underground insulated cables (UGC). Almost all the investigations published so far, when analysing maintainability issues, take into account only the costs of planned periodical maintenance; here, a method for assessing also the expenses sustained for repair after random failures is proposed. The number of random failure events for each kind of component over the whole service life of a transmission line can only be predicted on probabilistic basis: its expected value is estimated by making use of the mean values of relevant failure rates from recent statistical surveys. The whole procedure is shown by carrying out a particular case study as an example; nonetheless, the method may be widely applied to any type of OHL-UGC comparison.Pubblicazioni consigliate
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