多回同相多根并联高压电力电缆电流分布及金属护套环流计算  

Circulating Current in Sheaths and Current Distribution on Same-phase Parallel Multi-cable of Multi-circuit Power Cable Lines

作　　者：田金虎[1] 刘渝根[2] 赵俊光[3] 田大鹏[4] 尚龙龙 

机构地区：[1]国网重庆市电力公司检修分公司,重庆400039 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [3]国网重庆市电力公司江津供电分公司,重庆402260 [4]国网青海省电力公司检修公司,西宁810000

出　　处：《高电压技术》2014年第1期153-159,共7页High Voltage Engineering

基　　金：国家创新研究群体基金(51021005)~~

摘　　要：为研究多回同相多根并联电力电缆线路环流及电流分布,建模并结合实际线路进行了计算。首先建立了等值电路计算模型,推导了多回同相多根并联电缆线路环流及电流分布计算方程并编制求解程序。然后对实际设计的某24根电缆同沟布置的多回同相双根并联电缆线路护套环流及同相并联电缆电流分布进行了计算、优化。结果显示:同相并联的两根电缆线路并未对该相负荷电流进行均分,其上通过的电流大小不相等;2种不同线路布置方式中,有一种的电缆电流分布不均匀程度及护套环流相对另一种均得到了明显改善;以较好方式布置的220kV线路一、二的相序为BCA/ABC时,其同相并联电缆线路电流分布不均匀程度、护套环流均最小。Using a model established and based on practical line configurations, we calculated the circulating current in sheaths and current distribution on samephase parallel multicable of multicircuit power cable lines. Firstly, the equiva lent circuit model was established, and then equations as well as an according solution program were deduced. Secondly, the sheath circulating current and the current distribution of a practical multicircuit cable, which comprised 24 cables in one ditch, were calculated and optimized. The results show that two cables of one phase have uneven currents. Between the two typical arrangements of the cables, one has significantly better performance than the other in the aspects of sheath current and current distribution. For 220 kV parallel multicircuit cable lines with this better cable arrangement but dif ferent phase arrangements, the one with the phase arrangement as BAC/ABC for its two circuits has the most uniform current distribution and the smallest circulating current in sheath.

关 键 词：电力电缆 多回路 同相多根并联 护套环流 电流分布 不均匀系数 

分 类 号：TM751[电气工程—电力系统及自动化]