摘要
单芯电缆同相多根并联运行给电缆线路带来了电流分配不均匀、感应电压过高以及线路参数难于确定的问题,为此对同相多根并联线路的电路模型进行了分析,给出了电缆同相多根并联运行时电流分配以及感应电压的计算方法;利用矩阵变化,提出了电缆同相多根并联运行时线路序阻抗的计算方法,并利用实际线路验证了电缆的电流分配系数。通过改变电缆排列方式、敷设间距等参数,对单芯电缆同相3根并联运行线路进行了电流分配与感应电压的优化,优化结果表明,将不同相3根电缆组成的品字形,能有效地均匀分配电流,降低线路感应电压。该研究能用于指导单芯电缆同相多根并联运行的设计与运行。
Single-core power cables in parallel may bring about the problems the unevenness of the current distribution,high induced voltage and determination of the sequence impedance for the circuit,so a theoretical calculation method of current distribution and induced voltage is given.A calculation method of the sequence impedance for paralleled cables is also developed based on sequence impedance matrix transform and symmetrical components method.And the measured results of the two practical power cable circuits verify the current distribution calculation results.An optimization of current distribution and induced voltage is performed on a cable circuit parallel three sing-core cables per phase through changing layout and distance of these cables,the results show that a triangular composed by 3cables of different phase can effectively average the current distribution,and minimize the induced voltage.The research can be used to design and analyze the single-core power cables in parallel.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第10期2607-2612,共6页
High Voltage Engineering
基金
国家电网公司科技项目(SG0865)~~
关键词
同相多根并联
电力电缆
电流分配
感应电压
序阻抗
载流量
many cables in parallel
power cable
current distribution
induced voltage
sequence impedance
ampacity
