摘要
为研究多回电缆并联运行护套感应电压对电缆运行安全和人身安全的影响,提出了适用于并联电缆护套感应电压的计算方法。以电磁感应定律为基础,先建模计算负荷电流在各回电缆线路的具体分配,再据此推导不同护套接地方式的多回并联运行电缆护套开口感应电压和护套沿线最大值感应电压的计算。以双回电缆并联运行为算例,分别编程求解了该方法和现有文献方法在几种典型敷设方式下的护套感应电压。并以数字仿真结果为参考对比分析了误差大小,结果证明了该方法的正确性。通过分析几种因素对护套感应电压的影响发现:并联运行电缆护套感应电压相对于单回电缆可能增大很多,选择交叉互联接地和品字形相序排列能显著降低并联电缆护套感应电压。
For the study of sheath induced voltage of multi-circuit single-core power cable lines in parallel influencing on cable operation security and personal safety, a new algorithm suitable for sheath induced voltage of multi-circuit single-core power cable lines in parallel is proposed. Based on the electromagnetic coupling principle, by modeling and calculating, every cable line＇s current distributed from the load current is gained firstly, then based on the results of current distribution, the calculation of sheath open induced Voltage and maximum induced voltage along the sheath for every sheath grounding method are derived. With double-circuit cable lines inp^allei as example, tfi^e neff-~lg6ritt~ ~d the algorithm existed in the literature are both applied to several typical phase sequence arrangement methods, and the two theoretical calculation results are both calculated by programming, then the results of digital simulation for reference, the error size of the two theoretical calculation are compared and analyzed, proving the correctness of the new algorithm. By analyzing the influence of several factors on the sheath induced voltage the followings are found： relative to the single cable, the sheath induced voltage of multi-circuit single-core power cable lines in parallel may increase a lot, choosing the cross grounding method and the triangle disposition phase sequence arrangement can significantly reduce sheath induced voltage of multi-circuit single-core power cable lines in parallel.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2015年第22期77-84,共8页
Power System Protection and Control
关键词
电力电缆
并联运行
感应电压
护套接地
相序排列
power cable lines
parallel operation
induced voltage
sheath grounding
phase sequence arrangement
