National Grid identified that the 400/132kV 240MVA Super Grid Transformer (SGT1) and 13kV 30+30MVAr Shunt Reactor (SHR1) at Kingsnorth Substation require replacement due to their condition.
The Works included detailed civil, primary, and secondary design and engineering, project management, SHEQ management, the removal of redundant in-situ Super Grid Transformer, Shunt Reactor, primary and secondary equipment, structures, foundations, and bund walls, etc.
Procurement of materials and equipment, civil works, installation and commissioning of new primary equipment, protection and control modification works, LVAC upgrades, etc. During the replacement of the SGT, Shunt Reactor and primary switchgear, busbar disconnectors, line disconnectors and earth switches were refurbished.
Several challenges had to be overcome during the construction works, in particular, contaminated ground, which had to be shipped from the site for processing, causing significant delays to the programme. The GTDS delivery team made a huge effort to make up the lost time, ensuring that the SGT and Shunt Reactor were stage 1 commissioned and energised on time.
This case study is taken verbatim from the GTDS website, originally published in 2023.
