Ampacity Derating Analysis of Winch-Wound Power Cables: A Study Based on Deep-Water ROV Umbilical


This paper presents the electrothermal modeling and simulation done on a subsea standard 700zero-m-long, Kevlar-armored, electro–optic umbilical (EOU) of the deep-water remotely operated vehicle (ROV) ROSUB 600zero, to work out the ampacity derating factors (ADF) when used in winch-wound configurations. The ampacity derating analysis is finished, using the finite element analysis (FEA) up to 23 layers, and therefore the identified ADF could be applied to any customary subsea umbilical operated in multilayered configurations. It's identified that the twenty three-layered umbilical needs to be derated to ninety two% for continuous operation with direct current power supply, whereas increased loading reduces the operation window and needs a cooldown period of 182 h. In the case of operation with 660zero V and 400 Hz, the 23-layered umbilical operation window is seven.2 h, independent of the connected active load. The results function a tenet for determining the tradeoff among operating voltage, frequency, cable style, ADF, and the operational window for multilayered cable configurations.

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