System Impedance Measurements of Power Cable Umbilicals

This paper considers measurements of electrical parameters for subsea power umbilicals. Electrical system parameters given in the umbilical datasheets may be inadequate for dimensioning the electrical system as they often are IEC-specifications. The parameters may be estimated by finite element analyses, but the models used in these analyses must be calibrated for different umbilical designs. A measurement method giving all relevant electrical parameters for power system calculations and model calibrations is therefore established. The method is tested on several umbilical and power cable designs from different manufacturers through ten years work.