Braidwood Primary Substation - SP Energy Networks (SPEN)
Project Location:
Braidwood Primary Substation
Client Name:
SP Energy Networks (SPEN)
Project Description:
Our teams delivered a full refurbishment of the primary transformer T2 and its associated tap changer at Braidwood Primary Substation, Scotland.
Following a detailed survey identifying structural and operational defects, our teams were tasked with restoring the transformer to a safe, reliable, and fully operational condition.
The project ensured full compliance with environmental and operational standards.
Key Stats:
Full refurbishment of 12 MVA primary transformer
New gaskets, studs, and sight glasses installed
All cooling and protection systems tested and verified
Anti-corrosive coating applied for long-term protection
1 Week
Duration
Challenge
Extensive rust and oil leaks across the transformer body
Severely pitted and degraded tap changer components
Damaged, leaking sight glasses and cracked WTI mounting pads
Failed link box gaskets and missing studs
Strict environmental controls required for oil handling and containment
Solution
Surface restoration: Rusted areas cleaned, treated and recoated with anti-corrosive primer and topcoat
Oil management: Link boxes and conservator safely drained to specialist storage tanks
Mechanical repairs:
Link box gaskets replaced and missing studs welded
Tap changer drained, inspected, and refilled with new insulating oil
Custom sight glasses manufactured and installed
Testing and calibration:
Buchholz and WTI alarms tested and calibrated
Ductor testing and fan/pump balancing completed
Insulation resistance verified across all systems
Component replacement: Silica gel in the main tank breather renewed
Outcome
All identified issues fully resolved, restoring transformer stability and reliability
Extended asset lifespan through protective coatings and component replacement
Safe recommissioning of the transformer in line with operational and safety standards
Transformer returned to service, fit for long-term operation
