Hubei university of technology
针对综合管廊中电缆运行时存在的温度较高导致灾害的问题，开展综合管廊电缆运行的温度场分布及影响因素研究。通过ANSYS建立有限元数值模型，研究了管廊电缆温度场的分布规律，分析了电缆缆芯层间距、支架层间距、电流大小对电缆温度场分布的影响。研究结果表明：当电缆间距和支架层间距大于0.6 m时，对电缆的温度场分布影响较小，电缆布置间距建议取为0.2 m,支架层间距宜为0.2 m；管廊电缆温度场影响范围与电缆电流大小、电缆间距和支架层间距无关，主要影响范围为0.83 m；电缆电通量与电缆运行时温度、支架层间距呈ExpAssoc函数关系，当电流每增加10 A，电缆运行温度增加6 ℃，可通过在线监测电缆的温度场分布，根据其关系推算电缆的载流量大小，对电缆负荷进行监控，确保电缆的安全运行。
In view of the problem that the high temperature in the operation of cables in the comprehensive pipe gallery leads to disasters, the temperature field distribution and influencing factors of the operation of cables in the comprehensive pipe gallery are studied. Based on the finite element numerical model established by ANSYS, the distribution law of the temperature field of the cable in the pipe gallery was studied, and the influence of the distance between the cable core layer, the distance between the support layer and the current on the distribution of the temperature field of the cable was analyzed. The results show that when the cable spacing and bracket spacing are greater than 0.6 m, the temperature distribution of the cable is less affected. The cable spacing is suggested to be 0.2 m, and the bracket spacing should be 0.2 m. The influence range of cable temperature field in pipe gallery is independent of the size of cable current, cable spacing and bracket spacing, and the main influence range is 0.83m. The electric flux of the cable is in an ExpAssoc function relationship with the temperature of the cable and the distance between the bracket layers. When the current increases by 10 A, the operating temperature of the cable increases by 6 ℃. The temperature field distribution of the cable can be monitored online, and the load of the cable can be monitored according to its relationship.