标准摘要
[中文适用范围]： 本标准描述了计算所有电压等级电缆在通风隧道中连续载流量系数的方法。该方法适用于任何类型的电缆。 该方法适用于自然通风和强制通风。 假设电缆和隧道周围环境的纵向热传递可以忽略不计。 假设隧道内的所有电缆都相同，并且隧道横截面沿隧道距离不发生变化。 [外文原描述]： IEC 60287-2-3:2024 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 60287-2-3:2024 describes a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels. The method is applicable to any type of cable. The method applies to natural as well as forced ventilation. Longitudinal heat transfer within the cables and the surroundings of the tunnel is assumed to be negligible. All cables are assumed to be identical within the tunnel and it is assumed that the tunnel cross-section does not change with distance along the tunnel.
英文名称Electric cables - Calculation of the current rating - Part 2-3: Thermal resistance - Cables installed in ventilated tunnels