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Lisburn Re-insulation

This contract involves major refurbishment works on the NIE 275kV Overhead Line main Grid infrastructure in Lisburn, Co. Down.

Challenges
275kV System outages can vary in length for up to 3 weeks but the line may have to be restored at short notice in the event of a system requirement.

Result
The work involves replacement of all 275kV Insulator chains – both on Suspension and Tension towers. Line platforms are used on the Tension towers for access to the insulators to reduce the need for heavy plant.

The line Conductor spacers for twin-conductors are also being changed using especially designed line bicycles. A rigorous line earthing procedure is carried out to ensure GTS crew safety and the earths are removed when the Works are complete.