标准摘要
[中文适用范围]： 本部分IEC 60287描述了计算所有电压电缆在通风隧道中连续电流额定系数的方法。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内的纵向热传递可以忽略不计。 假设隧道内所有电缆相同，且隧道横截面沿隧道长度方向不发生变化。 [外文原描述]： 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