高压单芯电缆并联运行时金属护层的联接方式分析

随着经济的发展和用电量的不断增加,同相多根单芯电缆并联供电方式多有采用。高压单芯电缆的金属护套联接方式是电缆敷设时必须注意的问题。目前单、双回路电缆线路感应电压及金属护套环流已有计算,但多根电缆并联使用时的金属护套联接方式还未见讨论。文章研究结果显示并联电缆的护层环流在其护层相联时有可能达到单独处理时的2倍多。因此,电缆并联运行时,不应将金属护套相联再进行交叉互联,而应该分别作交叉互联。

Study on the Metal Shield Connection Manner of High-voltage and Single-core Parallel Cable

With the development of economy and the increasing power,the single-core parallel cable is widely used in power supply.The metal sheathed connection manner of high-voltage and single-core cable must be considered during cable installation.Currently the induced voltage and metal sheath circulating current of single and double loop cable have been calculated.However,the connection manner about parallel cable is not discussed.In this paper,circulating current in the metal shield of singlecore parallel cable is calculated.The results shows that the cable circulation current of metal sheath when connected in parallel is more than two times of separate metal sheath.So,the metal shield of high-voltage and single-core parallel cable should not connect each other in one phase.