10 kV三芯交流电缆不同敷设情况下的直流化改造

交流线路的直流化改造可缓解城市部分线路供电压力过大的问题。为尽可能提高改造后电缆线路的功率传输能力，对改造后的运行参数即载流量和运行电压进行研究。文中以城市配电网常见的10 kV三芯交流电缆为例，对空气、直埋和排管3种敷设情况下的电缆进行直流化改造仿真研究。首先，依据温度场和电场仿真结果，得出3种敷设情况下电缆的直流载流量和合适的运行电压范围。然后，以仿真所得的载流量和运行电压为基础，分析电缆改造前后的最大传输功率。最后，对多回线路敷设时的温度场进行仿真。研究结果表明，3种敷设情况下，交流电缆直流化改造后，功率传输能力均有提升，且直埋敷设的提升效果最为明显。

DC transformation of 10 kV three core AC cable under different laying conditions

In this paper, the 10 kV three core AC cable in urban distribution network is taken as an example to simulate the DC transformation of the cable under the three laying conditions of air, direct burial and pipe laying. The thermal electrical coupling module and electromagnetic thermal flow coupling module of ANSYS finite element simulation software are used to simulate the cable, and the cable is divided into three connection modes: monopole asymmetry, bipolar three wire and three pole. Firstly, according to the simulation results of temperature field and electric field, the DC current carrying capacity and appropriate operating voltage range of the cable under three laying conditions and three wiring modes are obtained. Then, based on the current carrying capacity and operating voltage obtained from the simulation, the maximum transmission power before and after the cable body transformation is analyzed. Finally, the temperature field simulation of multi circuit line laying is carried out. The results show that the power transmission capacity of AC cable is improved after DC transformation, and the effect of directly buried laying is more obvious.