10 kV三芯交流电缆不同敷设情况下的直流化改造  

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

作　　者：赵莉华[1] 周冬冬 王仲[1] ZHAO Lihua;ZHOU Dongdong;WANG Zhong(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Shaoxing Power Supply Company of Zhejiang Electric Power Co.,Ltd.,Shaoxing 612000,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]国网浙江省电力有限公司绍兴供电公司,浙江绍兴612000

出　　处：《电力工程技术》2022年第4期143-149,共7页Electric Power Engineering Technology

基　　金：四川省科技计划项目(2020YJ0318);中国博士后科学基金资助项目(2018M643475)。

摘　　要：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。The direct current(DC)transformation of alternating current(AC)lines is expected to alleviate the problem of excessive power supply pressure in some urban lines.It is necessary to study the current capacity and operation voltage to improve the power transmission capacity of the cable line after the transformation.The 10 kV three core AC cable in urban distribution network is used as an example to simulate the DC transformation under three laying conditions of air,direct buried and pipe laying.Firstly,the DC current capacity and suitable operation voltage range of the cable under three conditions are obtained according to the simulation results of temperature and electric field.Then,the maximum transmission power before and after the cable transformation is analyzed based on the current capacity and operation voltage of the simulation.Finally,the temperature field simulation of multi circuit line laying is carried out.The study results show that the power transmission capacity of DC cable which transforms from AC cable is improved,and the improvement of direct buried laying is the most obvious under three kinds of laying conditions.

关 键 词：10 kV三芯交流电缆 直流化改造 不同敷设情况 不同接线方式 耦合场仿真 功率传输能力 

分 类 号：TM726.4[电气工程—电力系统及自动化]