EPC · T10 · Grid & electrical
Substations — HV, EHV & Grid Infrastructure EPC
The electrical infrastructure that connects generation, transmission, distribution and industrial networks.
BARREL supports substation and switchyard packages covering civil works, primary electrical systems, protection and control, auxiliary systems, communication and grid integration.
Primary and secondary engineering are developed together, so that protection, control and SCADA are designed for the switchyard that is actually built.
- Segments
- 10
- Work packages
- 5
- Scope items
- 52
01 · Classification
Technology segments
- 01
Air Insulated Substations (AIS)
- 02
Gas Insulated Substations (GIS)
- 03
Hybrid substations
- 04
Digital substations
- 05
Generator switchyards
- 06
Renewable pooling substations
- 07
Transmission substations
- 08
Industrial substations
- 09
HVDC converter station packages
- 10
Mobile and modular substations
02 · Value chain
Detailed substation value chain
Every package is defined in the proposal with its interfaces, specifications, milestones and acceptance criteria.
- 01
Primary engineering
10 scope items- Substation configuration
- Busbar arrangements
- Single-line diagrams
- Equipment specifications
- Short-circuit study coordination
- Insulation coordination
- Lightning protection
- Earthing system design
- Equipment layout
- Electrical clearances
- 02
Major equipment
10 scope items- Power transformers
- Instrument transformers (CTs, VTs/CVTs)
- Circuit breakers
- Isolators and earth switches
- Busbars and connectors
- Surge arresters
- Insulators
- Reactors and capacitor banks
- Neutral grounding equipment
- Switchgear and control panels
- 03
Civil and structural works
9 scope items- Site grading and drainage
- Transformer foundations
- Equipment foundations
- Control room buildings
- GIS halls
- Cable trenches
- Oil collection and fire protection
- Gantries and structural steel
- Roads and perimeter infrastructure
- 04
Secondary systems
11 scope items- Protection relays
- Control and relay panels
- SCADA
- SAS and digital control systems
- IEC 61850 communication, where specified
- Metering
- Event and disturbance recording
- Telecommunication
- Cybersecurity interfaces
- DC battery and charger systems
- UPS and auxiliary AC supply
- 05
Testing and commissioning
12 scope items- Transformer testing
- Circuit breaker testing
- CT/PT testing
- Relay injection testing
- Interlock verification
- Busbar and insulation testing
- Earthing verification
- SCADA point-to-point testing
- Communication testing
- Functional testing
- Grid interface testing
- Energisation and handover
One delivery framework
Specialist scope. Common discipline.
Every technology page keeps its own engineering identity; every project runs on the same controls, quality, HSE and handover framework.
Project enquiry
Develop your substation project.
Share the technology, location, capacity and stage of your project. BARREL's engineering team replies with the scope it can take on, the specialist partners it would bring in and the next step towards a technical proposal.
Performance guarantees, output guarantees and turnkey responsibilities are contract-specific and are set out in each proposal.
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