Extra High Voltage (EHV) switchgear, transformers and electrical protection inspection and Maintenance

Tender description

The provision of emergency call-out services, routine inspection and maintenance of Obsolete and aged (50+ years) Extra High Voltage (EHV) switchgear, transformers and electrical protection only (and not replacement of the same) at Dungeness A, Maentwrog, Trawsfynydd, Wylfa and potentially Hinkley point B. Lot 1: The provision of emergency call-out services, routine inspection and maintenance of Obsolete and aged (50+ years) Extra High Voltage (EHV) switchgear, transformers and electrical protection only at Dungeness A, Maentwrog, Trawsfynydd, Wylfa and potentially Hinkley point B.<br/><br/>The expertise and experience requirements for each site are as follows:<br/><br/>Dungeness A, Trawsfynydd & Wylfa<br/><br/>Maintenance of 275 kV and 132 kV Air Blast Circuit Breakers including ability to source, refurbish, remanufacture or replace existing components / equipment. A particular requirement is knowledge and experience of 275 kV Reyrolle OBR60 Air Blast Circuit Breakers.<br/>Maintenance of 275 kV / 11 kV and 132 kV / 11 kV oil filled transformers with in-tank or externally mounted on-load tap-changers.<br/><br/>Maintenance and testing of transformer differential protection systems.<br/><br/>Working under NGET Safety Rules.<br/><br/>Note: The equipment at Wylfa is planned to be decommissioned in 2026 so minimal work is expected to be carried out at Wylfa beyond March 2026.<br/><br/>Due to the agedness and obsolescence of the equipment NRS are currently exploring options to enable the decommissioning of equipment at Trawsfynydd & Wylfa in favour of moving to Distribution Network Operators (DNO’s) during the life of the proposed contract (full replacement of existing and commissioning of new equipment is not a requirement that will be covered by this contract).<br/><br/>Maentwrog<br/><br/>Maintenance of 33 kV SF6 insulated switchgear.<br/>Maintenance of 33 kV / 11 kV generator transformers.<br/>Maintenance and testing of transformer differential protection systems and generator protection systems.<br/><br/>Working under Scottish Power MANWEB Safety Rules.<br/><br/>Hinkley point B<br/><br/>During the life of this contract the responsibility for managing and decommissioning Hinkley point B power station will pass from EDF to NRS and it is possible that similar services may be required at these locations.<br/><br/>However, it is not currently known what arrangements are in place or if existing contractual arrangements will extend beyond the handover dates and therefore require novating to NRS.