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A new Cigré guide for thermal rating calculations of overhead lines, Cigré TB 601 [1], was issued in December 2014. It was an update of the previous Cigré TB 207 [2], covering the same subject. The new Cigré guide has been improved for several issues; mainly a more accurate model for steel core conductors operating at high current densities, an improved solar heating model and an improved convection...
Since 2006, RTE has been installing Aluminium Conductor Steel Supported (ACSS) type low-sag cables on the network. These steel-core conductors are covered by annealed trapezoidal-shaped aluminium wires, giving them superior power ampacity compared to conventional round wires conductors. Thanks to a lower coefficient of thermal expansion they can carry greater currents. However, if the conductor reaches...
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