Viper Innovations Limited

Paul Robert Overton

Neil Irwin Douglas

Alistair John Wright

Steve Simpson

Dan Denning

Described is a cable rejuvenation apparatus for a cable used in a subsea environment. The apparatus applies a bias signal to a conducting element of the cable, the bias signal being selected to improve the insulation properties of the cable. The bias signal is generated by a bias signal generator that includes a voltage source that generates a bias voltage having a time varying component. The bias voltage promotes an electrochemical reaction between the conducting element and the salt containing liquid of the subsea environment resulting in the formation of a barrier material at the fault location restricting further leakage current flow and enhancing the insulation resistance of the cable. The bias signal is a voltage selected such that the electrochemical reaction promoted by the bias voltage maintains the presence of the barrier material at the fault location.

Rejuvenation of subsea electrical cable insulation

A power supply arrangement is described that comprises a power supply moduleincluding a supply connectorand an output connector, and an electrical circuitinterconnecting the supply connectorand the output connector, the electrical circuitincluding a test pointto which a test modulemay be connected, the test pointbeing electrically connected to the output connector

Power supply arrangement

Described is a rejuvenation method for a cable used in a subsea environment. The method includes applying a bias signal to a conducting element of the cable, the bias signal being selected to improve the insulation properties of the cable. The bias signal is selected such that, in the event of an electrical leakage current of predetermined magnitude flowing between the conducting element and a salt containing liquid of the subsea environment at a fault location. The bias signal can be a voltage which promotes an electrochemical reaction between the conducting element and the liquid resulting in the formation of a barrier material at the fault location restricting further leakage current flow and enhancing the insulation resistance of the cable. The bias signal is selected such that the electrochemical reaction promoted by the bias signal maintains the presence of the barrier material at the fault location.

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Portishead, United Kingdom

Paul Robert Overton