Design and construction supervision of a SUME substation

Context and challenges

This client is a leading group in the energy sector. This customer has decided to reinforce a SUME(1) power substation (225 / 20 kva) in Paris with the objective of replacing the existing transformer by two new ones in order to resolve the so-called "classic N-2" constraints. This power substation will contribute to supply the first external ring in Paris (20 kV), notably during the 2024 Olympic Games. The building will be constructed in a DUA (Extremely Dense Urban Area) environment with adjoining residential buildings and 3 main constraints:

The safety and protection of people
Operating and maintenance constraints
Respect of the environment

This client selected Assystem to carry out the studies and supervision of the construction of the building as part of a complete project management services contract, within a consortium of several companies.

Project scope

Intervention in all phases of the project management services contract:

Carrying out studies: Drafting studies, Preliminary design, Detailed design, Project-Tender, Assistance for the Contracting of Works, Approval of Execution studies, Management of the Execution of the Works Contract(s), Assistance to Project Owner & Completion Guarantee
Management and realisation of the digital mock-up (BIM under REVIT)
Contribution to the estimate of the works budget

Additional missions:

Geotechnical studies, retaining structures and soil injection
Design studies of architectural elements made of earth and wood for local use in the construction of the structure
Obtaining building permits

Technical perimeter carried by Assystem: RMN (Roads and Miscellaneous Networks), SW (Structural Work), Structure (metal & wood), High Voltage Current/Low Voltage Current, Boilermaking

key figures

The building has 7 levels: 2 basements, the ground floor, 4 floors. It will house a SUME(1) with:

1 transformer and their High Voltage B/ High Voltage A annex premises
1 room for remote controls, control and relay (Low Voltage)
1 social room

It also includes some special infrastructure:

Supply and discharge of High Voltage B/ High Voltage A power supply cables
Channels, ducts and sleeves for the internal connections and external surroundings of the station

(1) Substation Under Metallic Enclosure