500kV电缆隧道的热场分析

Thermal field analysis for 500 kV cable tunnels

通过数值模型对隧道内的电缆发热对隧道的热场进行模拟计算分析,得到了隧道热场受负荷、隧道直径、深度等因素的影响关系,并采用了缩小比例试验及现场验证手段对模型准确性进行了验证。对正在建设中的500 kV世博隧道的热场进行了预测,并提出了降低隧道温度的措施及效果分析。

The cable tunnel is now widely used in Shanghai,and the study of its thermal field is considered important to scientific selection of the parameters of the tunnel and the cable,and the cooling methods for the cable.By using numerical models,the influence of cable heating on the thermal field of the tunnel was analyzed,and consequently the relationship between the thermal field and factors of load and the tunnel′s width and depth was obtained.Then the model was verified by a small-scale experiment and field tests. The model was used to predict the thermal field of 500 kV Shibo Tunnel in operation, and suggestions on tunnel temperature reduction were proposed, and the outcomes were analyzed.