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In order to schedule the choice of maintaining or refurbishing MV equipment, an electrical utility may study ageing effects on different pieces of such equipment. In this paper, the analysis is based on record of outages (MV power cuts) during several years where causes of outages are noticed (and ages of pieces of equipment are also known). Failure rate versus age estimation results are given for...
In power system planning and operation, accurate assessment of reliability worth is essential for making informed decisions. One common simplification when modeling power system reliability is assuming constant failure rates and non time-varying restoration times. However, historical outages show differently; failure rates and restoration times for especially overhead lines are dependent upon time-varying...
Up to now, to analyze and design the operational limits of transmission lines, many utilities still apply traditional deterministic approaches, which have long been recognized as excessively conservative. In this work, we propose a different overload protection scheme in order to increase the line ampacity. The main idea is to include the thermal model of overhead lines inside the protection and then...
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