FPSO中高中压单芯电缆金属护套接地方式的研究

Research on Grounding Mode for High and Middle Voltage Single Core Cable Metal Sheath in FPSO

本文介绍了单芯电缆金属护套常见的接地处理方式,分析感应电压产生的原因。金属护套的感应电压除了和运行负荷的工作电流,电缆排列的方式,线芯的间距有关,还与供电回路数量,护套的接地方式选择有关。最后,结合巴油P70项目采用电缆的参数及分析计算,指出实际敷设中应采用三角型排列,金属护套采用单端接地处理方式。

Common grounding methods of single core cable metal sheath are introduced, the causes of induced voltage are analyzed. The induced voltage of metal sheath is related not only to the load current, cable arrangement and phase wire spacing, but also to power supply circuit number and sheath grounding mode. finally, combined with Petrobras P70 project cable parameters and calculation of different way of laying mode induction voltage, in fact using triangular laying and single terminal grounding.