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Calculation and analysis of sheath induced voltage for multi-circuit single-core power cable lines in parallel
Author(s): 
Pages: 77-84
Year: Issue:  22
Journal: Relay

Keyword:  power cable linesparallel operationinduced voltagesheath groundingphase sequence arrangement;
Abstract: 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.
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