33/220 kV Pooling Substation
- Client
- Anandshree Renewables
- Scope
- Complete detailed engineering consultancy
Infrastructure sector
Pooling & Power Evacuation Substation Engineering
Collector feeder bays, pooling transformers, AIS/GIS switchyards and evacuation bays for solar, wind, hybrid and storage projects, at 33/132 kV, 33/220 kV, 220/33 kV and other project voltages.
What a pooling substation does
A pooling substation collects the output of a renewable plant, or several plants, from medium-voltage collector feeders and steps it up through one or more power transformers to the transmission voltage. Its outgoing bays connect to the evacuation line that carries power to the grid.
The design has to satisfy two sets of requirements at once: the plant side, where feeder count, ratings and protection follow the plant layout, and the utility side, where metering, protection, SCADA and switching arrangements follow the connection approval. Names such as 33/220 kV and 220/33 kV describe the same kind of station from opposite directions; we follow the project’s own convention.
Typical voltage pairs. 33/132 kV, 33/220 kV and 220/33 kV, with 400 kV evacuation on larger schemes. The project decides the arrangement.
Scope by document type
Pooling substation design is a core CoreGrid service: electrical and civil, drawings and calculations, through to final issue. Examples are the Anandshree Renewables 33/220 kV assignment (complete detailed engineering consultancy) and the Hartek Power 220/33 kV wind pooling substation (complete civil engineering consultancy).
Electrical drawings
- Complete applicable SLD: collector feeders and grid interface
- Overall GA, electrical layout plan and sections
- Protection and metering SLD
- Erection Key Diagram (EKD)
- AC / DC auxiliary SLD; earth mat and DSLP layouts
Design / sizing calculations
- Busbar / conductor sizing, SCF and sag–tension
- Earthing and DSLP
- CT, VT / CVT, battery and charger sizing
- Cable sizing, DG and illumination
- Relay settings, where contracted
Grid / power system studies
- Load flow, short-circuit and protection coordination
- Reactive power and voltage
- Grid interconnection study
- Only as the project requires
Civil & structural
- Switchyard structures; ICT and equipment foundations
- Control room (MCR / CRB) and GIS hall
- Cable trenches, roads and drainage
- Calculations and drawings for each
The contract and MDL decide which items a given pooling substation package includes.
Electrical discipline: full lists Civil & structural: full lists Studies
Inputs the design depends on
| Input | Why it matters |
|---|---|
| Plant capacity and collector feeder count | Sets bay count, bus rating and transformer size |
| Connection approval and utility requirements | Fix evacuation voltage, metering, protection and SCADA arrangements |
| Transformer and switchgear GTPs | Fix dimensions, loads and clearances |
| Soil and survey data | Earthing design, grading and foundations |
| Plant layout and cable routes | Feeder entry positions and trench layout |
Interfaces
| Interface | Typical counterparty | What is coordinated |
|---|---|---|
| Plant collection system | EPC contractor, inverter or turbine OEM | Feeder ratings, cable entries, protection grading |
| Utility connection | Transmission licensee | Metering, protection, SCADA signals, switching |
| BESS or reactive compensation bay | Storage OEM, EPC contractor | Bay rating, protection and control interface |
| Evacuation line | Line designer or EPC contractor | Line entry gantry, tension, shield wire termination |
Representative pooling substation assignments
220/33 kV Wind Pooling Substation
- Client
- Hartek Power Pvt. Ltd.
- Scope
- Complete civil engineering consultancy
Client is the company that awarded CoreGrid the work. Plant owners, developers and locations are not shown.
Related
Share your SLD, technical specification or MDL for an engineering proposal
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.