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, general arrangements and sections, Erection Key Diagrams, earthing and DSLP layouts, structure and foundation drawings, building and trench drawings, tower drawings.
Conductor and busbar sizing, busbar short-circuit force and sag–tension, earthing, DSLP, 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 air- and gas-insulated substations and switchyards: new stations, bay extensions and interconnecting transformer yards.
AIS/GIS Substations & Switchyards
Solar PV systems, wind-farm electrical infrastructure, collector networks and shared evacuation, with the plant scope as actually contracted.
Solar, Wind & Hybrid Power Projects
Wind and solar pooling substations from collection to the grid interface, with the associated electrical and civil engineering, at 33/220 kV, 220/33 kV and other project voltages.
Pooling Substations & Power Evacuation
Utility-scale BESS sizing and configuration, electrical balance of plant, PCS and transformer interfaces, civil interfaces and grid integration.
Battery Energy Storage Systems (BESS)
Conductor and earth-wire selection, sag-tension and stringing charts, tower design, tower foundations and line-profile engineering.
Overhead Transmission Lines
Supporting engineering for bipolar and back-to-back schemes (service range up to ±512 kV / 2500 MW): AC-side, station and design-interface activities, as contracted.
HVDC SystemsMost 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.