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摘要
Distribution cables accumulation in trench is common, which intensifies the thermal impact among cables and reduces their ampacity. In this paper, according to the actual situation of a substation outgoing cables in trench, a thermal-fluid coupling simulation model is established, and the simulation accuracy is verified by its measured temperature. Load current is applied to the model, and their operating status is simulated. COSMOL with MATLAB co-simulation and differential evolution algorithm are used to predict their ampacity of no-load, heavy-load and section cables, and to optimize the configuration of the given new load on the light-load cables and all cables. The results show that, remaining the other conditions, the position and the load around the cable affect its heat dissipation and then affect its ampacity. The difference between the maximum and minimum ampacity predicted of the four no-load cables is about 8.8%. The higher the initial load is and the higher the temperature of cables is, the smaller the ampacity increase coefficient will be. Transient heat flow coupling simulation combined with differential evolution algorithm can maximize the predicted ampacity of cables, make the new load distribution more reasonable, and reduce their temperature. ? 2023 Science Press.
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