11kV Works - Didcot ‘B’ Power Station OCGT, Oxfordshire.

Power Station Owner & Operator Npower need to relocate the existing OCGT (open cycle gas turbine) 11kv switch room to allow for the decommissioning & demolition of Didcot B Coal fired Power station.  This meant considerable rerouting of cables and jointing works.

Scope of Works

Wootton & Wootton were contracted to carry out the following works:

• Installation of the new 11 KV 800mm XLPE CWS cabling between the new switch room and OCGT 1,2,3, & 4 including all cable management
• Installation of the new 11 KV 800mm XLPE CWS cabling between the new switch room and Station Transformer 1 & 2 including all cable management
• Installation of the new 11 KV 300mm Triplex cabling between the new switch room and Auxiliary Transformers 1&2.
• Installation of the new LV 1c 240mm AWA cabling between the new LVAC Board & Auxiliary Transformer 1 & 2.
• To install 24 x 11Kv transitional Bifurcating joints 2 x 1c 800mm XLPE CWS – 1c 1600mm PILC.
• To install 48 x 1c 800mm XLPE CWS Nexans Heat shrink indoor terminations.
• To install 12 x 300mm Triplex Nexans Heat shrink indoor terminations.
• To install 28 x 240mm LV terminations onto the LVAC board & Tx cable boxes.
•  To carryout AC VLF pressure tests on the new switchboard
• To carryout AC VLF pressure tests before and after jointing.

Summary

The works were successfully completed on time & budget despite the very awkward access to the switchgear cable boxes & cable management underneath the S/S.