66kV OHL to UG Diversion - ICI Fibres to Wheatley Park, Doncaster, South Yorkshire

Introduction.

Northern powergrid (NPg) decided to underground the small section of overhead line between Wheatley Park and ICI Fibres 66kV Substations due to high fault occurances on the OHL. The new Cct was approximately 1Km in length and was single ciruit 66kV and associated pilot & telephone cables.

Wootton & Wootton were contracted to modify the existing OHL concrete support structures into CSE structures, install intermediate straight joints (power & comms), installation of cable sealing ends, site supervision and pressure testing upon completion.

Despite a very tight outage programme with high volume of work to carryout in a short space of time our teams exceeded expectations and completed works ahead of schedule and on budget.         
 

Scope of Works.
To install 6 x 66kV ABB APED self-supporting sealing ends 1c 66kV XLPE 500mm Cu Pb sheath.

To install 6 x 66kV Tyco straight joints 1c 66kV XLPE 500mm Cu Pb sheath.

To install 2 x 7 pair jelly filled pilot straight joints.

To install 2 x 19 pair jelly filled pilot straight joints.

To supply, fabricate & install all steelwork to modify the existing structures to accept the new CSE's.

To supply and install new 50mm Cu bus,  bar and all associated clamps.

Install earthing to the new steelwork by using the braising technique.

To install phase discs and Cct name plates.

Successfully DC sheath test cable upon completion.

Successfully VLF pressure tests upon completion.

To supply standby supervision for civil and scaffolding works