Primary service
Post-award design for substations, renewable plants, pooling stations, battery storage, transmission lines and HVDC stations: design criteria, calculations, drawings, schedules and documents prepared to the project specification and taken through comment resolution to final submission.
Detailed engineering is the post-award stage, between the tender and construction.
| Stage | What happens | Typical CoreGrid outputs |
|---|---|---|
| Tender (pre-award) | The EPC contractor prices the work from the tender documents. | Scope break-up, preliminary SLD and GA, quantities, offer comparison, clarifications. See pre-bid engineering. |
| Detailed design (post-award) | The awarded design is developed, reviewed and approved by the client or its consultant. | Design basis, calculations, drawings, schedules, BOQ, vendor document review, CRS responses, final submissions. |
| Construction and commissioning | The EPC contractor builds and commissions; questions come back to engineering. | Site query responses, revised drawings, signal mapping and commissioning advisory, as contracted. See site support. |
The contract and its MDL decide which items a project needs.
SLD and key diagrams, general arrangements and sections, earthing and lightning layouts, structure and foundation drawings, building and trench drawings, tower drawings.
Conductor and busbar sizing, short-circuit forces, sag-tension, earthing, lightning protection, battery and cable sizing, structural and foundation design, tower loading.
Cable schedules, load lists, signal lists, bar bending schedules, BOQ and the master deliverable list.
Design basis reports, technical specifications, vendor review sheets, technical queries, comment resolution sheets and the drawing register.
System and bay design, layouts and clearances, conductor and bus calculations, earthing and lightning protection, equipment selection and checks, auxiliary AC/DC, cables, illumination, and protection, control and SCADA interfaces where in scope.
Electrical design & engineeringGrading and plot plans, steel structures, equipment and transformer foundations, oil containment, buildings, trenches and duct banks, drainage, roads, fencing, reinforcement drawings, BBS and quantities.
Civil & structural engineering
Electrical, civil and structural design for AIS and GIS substations and switchyards: new stations, bay extensions and interconnecting transformer yards.
Substations & Switchyards
Plant electrical balance of system, collection networks, plant layout interfaces and grid connection for solar, wind and hybrid projects.
Solar, Wind & Hybrid Plants
Pooling and evacuation substations that collect renewable output at 33 kV and step it up to 132 kV, 220 kV or higher for the grid.
Pooling Substations
BESS sizing, PCS and transformer interfaces, auxiliary systems, protection and SCADA interfaces, and connection to pooling or grid substations.
Battery Energy Storage
Line electrical design, single and double circuit tower design, sag-tension and stringing, and tower foundations by soil class.
Transmission Lines
Converter-station engineering, equipment specification and review, and study support for bipole and back-to-back schemes, as contracted.
HVDC EngineeringMost design errors start at an interface. We pass these items between disciplines as controlled data and check them before issue.
| When this is fixed | It drives |
|---|---|
| Transformer and reactor arrangement | General arrangement, foundation and oil-pit design, fire separation |
| Bus short-circuit forces and sag-tension | Gantry and support loads, then foundation design |
| Earthing study results | Earth mat layout, conductor sizes and equipment bonding |
| Vendor drawings and GTP | Support spacing, anchor bolts, terminal loads and cable routes |
| Solar, wind or BESS block layout | Collector circuits, pooling transformer bays, control room and evacuation design |
| Tower reactions and soil class | Tower foundation type and design |
Send us the tender extract, single-line diagram, master deliverable list or the specific calculation you need. We will confirm scope, inputs and a realistic submission sequence before any work starts.