The procedures of asset-management have been developed into a central element of network operation and planning in liberalised electric markets of power supply for the present. The method of asset management considers all relevant life cycle cost related to the network equipment and provides strategies for reinvestment, maintenance and fault elimination. However, the method requires practical information about the available failure statistic from distribution networks, as well as about the reliability evaluation of equipment installed in distribution network. For the quantitative evaluation we collect failure record data of distribution networks in the special failure statistic. Furthermore, this paper represents the first attempt at modeling the component reliability for representative electrical components due to electrical stress, mechanical stress, temperature and time, which takes general aging mechanisms of insulating materials into consideration. Thus the proposed models provide reliability estimates, e.g. failure probability and failure rate for distribution systems. These models can be not only parameterized with a great deal of statistical data but also determined by aging tests and breakdown tests being available for the probabilistic assessment. Our results imply that the assessment approach for component reliability will motivate a need for reasonable and accurate data at an early decision-making stage in future deregulation of electric power market.
Due to the large amount of electrical apparatus and the costs of an individual diagnosis in medium-voltage networks, a general consideration of some representative electrical components to assess the lifetime of the electrical apparatus is necessary. Under the investigation of the general ageing mechanisms of individual electrical components, a new method for the assessment of the lifetime of the electrical components is presented in this paper. This method utilises the life model, the probabilistic failure model and the enlargement law to predict the failure probability and the failure rate of the electrical components in medium-voltage networks for a future time period. Therefore, a relationship between lifetime and reliability of the electrical components is developed which supports the decisionmaking in deregulation of the electrical energy market later. It is demonstrated with cable and transformer data that the method is able to assess the lifetime and reliability of the electrical components with accurate and convenient data.Index Terms--assessment, electrical component, failure probability, failure rate, lifetime, medium-voltage network, model.
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