Nonmagnetic armor wire effect on induced current for subsea cables

Submarine power cables have been widely used for energy link across seas. Solid grounding at both ends is a common design which leads to highly induced current in the armor. To reduce the induced current, nonmagnetic copper wires are used by manufactures to replace the magnetic steel wires. However, the replacement effect is seldomly studied in detail. This paper establishes a 110 kV subsea cable in ATP/EMTP software. Different armor designs are applied in the model to study the nonmagnetic armor effect on the induced current. It has been shown that the nonmagnetic copper wire does not necessarily lead to lower induced current. Meanwhile the current in lead sheath is also affected.