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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...
At present there are no industry standards or recommended guidelines for the light rail transit DC overhead contact system (OCS) design that deal with lightning protection. Derivations of lightning intensity and lightning stroke surge energy are provided. Discussion of lightning stroke to OCS components and consequently flashing over to ground is included in this paper. Analysis of surge overvoltage...
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