National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Gas Transmission Networks
Current best practice for decommissioning oil filled lead sheathed cables is to
remove as much oil from the cable as possible and then leave the cables in the
ground or alternatively excavate the cable route to extract the cable (although
this is costly). The proposal is to pump biological agents into the out of service
cable that would degrade the oil impregnated insulation sufficiently to allow the
cable core to be extracted from the cable at joint positions. This would reduce
the environmental risk of the cable system, allow recovery of valuable materials
reducing waste and allow recovery of the cost of the material (generally
copper) and leave a conduit for future use.
Development of a technique to remove the core of an oil filled cable while the
cable is still buried in the ground. This will allow the copper conductor to be
recovered and leave an unfilled duct that can be re-used.