10 kV三芯交流电缆不同敷设情况下的直流化改造

本文以城市配电网中常见的10 kV三芯交流电缆为例,对空气、直埋和排管这三种敷设情况下的电缆进行直流化改造仿真研究。采用ANSYS有限元仿真软件中的热-电耦合模块和电磁-热-流耦合模块对电缆进行仿真,并将电缆分为单极不对称、双极三线和三极共三种接线方式。首先依据温度场和电场仿真结果得出三种敷设情况三种接线方式下电缆的直流载流量和合适的运行电压范围,然后以仿真所得到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大小,最后进行多回线路敷设时的温度场仿真。研究结果表明,交流电缆直流化改造后功率传输能力有了一定的提升,且直埋敷设提升效果更为明显。

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.