Outdoor Switchyard Steel — 33 kV to EHV
ENSOL fabricates the complete steel scope of an air-insulated switchyard — portals, isolator structures, bus supports and equipment-mounting frames — hot-dip galvanised and engineered to the clearances and loads of every bay.
What are switchyard structures?
A switchyard is the outdoor section of a substation where incoming and outgoing lines are switched, isolated and protected. Switchyard structures are the steel that holds isolators, busbars, breakers and instrument transformers at safe clearances. ENSOL fabricates this complete outdoor steel scope — from 33 kV yards to 220/400 kV EHV switchyards — galvanised and engineered to each bay's loads.
Complete switchyard scope
From portals to the last equipment mount — one fabricator for the whole steel package.
EHV-ready engineering
Structures detailed for the clearances and loads of 220/400 kV switchyards.
Galvanised for outdoors
Hot-dip galvanising for decades of maintenance-free outdoor service.
The complete outdoor steel package
Switchyard Steel
Complete outdoor switchyard steelwork — the full structural scope of an AIS yard.
Isolator Structures
Supports for isolators and disconnectors, aligned for reliable operation up to EHV.
Bus Supports
Rigid and strain bus support steel holding busbars at clearance.
Equipment Mounting Structures
Mounting frames for breakers, CTs, PTs, CVTs and wave-traps.
Portal Structures
Portal and gantry frames for line and bus bays.
Outdoor Switchyard
Full outdoor air-insulated switchyard structures for all bays.
EHV Switchyard
220 / 400 kV EHV switchyard steel engineered for extra-high voltage.
Switchyard structure specifications
| Voltage range | 33 kV up to 220 / 400 kV EHV |
|---|---|
| Structures | Portals, isolator, bus & equipment-mounting steel |
| Steel grade | IS 2062 E250 / E350 |
| Design standard | IS 800, IS 875 (relevant IEC & utility specs) |
| Galvanisation | Hot-dip per IS 4759 (86 / 130 micron) |
| Construction | Lattice & pipe / fabricated sections |
| Loading | Equipment, short-circuit, wind & seismic cases |
| Approvals | EPC- & utility-approved (GTP / drawing) |
| Documentation | GA drawings, BOM, MTCs, galvanising reports |
Switchyards we steel
Power Utilities
Outdoor switchyards for distribution and transmission.
Renewable Energy
Evacuation switchyards for solar and wind parks.
Industrial Plants
Captive switchyards for process and manufacturing.
EPC Contractors
Turnkey switchyard steel packages.
Engineered for the yard
33 kV to EHV
Switchyard steel from distribution yards to 220/400 kV EHV.
Correct Clearances
Structures dimensioned to phase and ground clearances by voltage.
IS 800 Design
Detailed and analysed per IS 800 with utility / EPC specs.
Hot-Dip Galvanised
Galvanising to IS 4759 for outdoor corrosion life.
CPRI-Tested Heritage
Built on decades of CPRI-type-tested isolator-equipment experience.
Full Documentation
GA drawings, BOM, MTCs and galvanising reports with every lot.
Layout to erection
Layout & Clearances
Bay layout, equipment positions and clearances detailed to drawing.
Structural Analysis
Analysis per IS 800 for equipment, short-circuit and wind cases.
Material & Cutting
IS 2062 steel verified and CNC / laser cut.
Fabrication
Drilling, welding and forming of portals and supports.
Galvanizing
Hot-dip galvanising to IS 4759 for outdoor durability.
Inspection
Dimensional and coating-thickness checks with traceability.
Dispatch
Marked, bundled and documented for switchyard erection.
Checked at every stage
Raw Material Inspection
Mill test certificates verified on every steel lot.
Dimensional Inspection
Members checked against fabrication and GA drawings.
Welding & NDT
Visual and NDT checks on critical welded connections.
Galvanizing (NABL)
Coating-thickness and adhesion accredited testing.
Trial Assembly
Portal and gantry trial assembly where specified.
Documentation
MTCs, galvanising reports and GA drawings issued.
Switchyards delivered across India
EHV Switchyard Steel
Location: Multiple states
Client: EPC Developers
Isolator & Equipment Structures
Location: Maharashtra
Client: State Utilities
Switchyard Portals & Supports
Location: Chhattisgarh
Client: CSPDCL / CSPTCL
Renewable Evacuation Switchyard
Location: Multiple states
Client: Renewable EPCs
A switchyard partner, end to end
ENSOL's CPRI-type-tested isolator and disconnector experience since 1981 informs every switchyard structure we build.
Portals, isolator supports, bus supports and equipment mounts — one fabricator for the whole outdoor switchyard.
Structures detailed for the clearances and loads of 220/400 kV EHV switchyards per IS 800.
Hot-dip galvanising under one ISO 9001 roof with NABL-accredited testing for outdoor durability.
Approved, tested, accredited
ISO 9001:2015
Certified manufacturing
CPRI Type-Tested
Isolators 33–245 kV
POWERGRID MQP
Approved vendor
NABL Galvanizing
Accredited test — Pass
Switchyard structures, answered
Common questions from utilities and EPC contractors.
Switchyard structures are the outdoor steel framework of an air-insulated switchyard — portals, isolator structures, equipment-mounting frames and bus supports that hold disconnectors, busbars and protection equipment at safe clearances. ENSOL fabricates this steel for switchyards from 33 kV up to EHV, hot-dip galvanised for long outdoor life.
ENSOL manufactures complete switchyard steel — isolator structures, bus supports, equipment-mounting structures, portal structures and full outdoor / EHV switchyard steelwork — detailed to the switchyard layout and equipment loads.
Switchyard structures are supplied from 33 kV distribution switchyards up to 220/400 kV EHV switchyards, for utilities, industries and renewable-evacuation projects.
Structures use IS 2062 steel designed per IS 800 with IS 875 loads, and are hot-dip galvanised to IS 4759 (86 micron standard / 130 micron marine) for outdoor corrosion protection.
Yes. ENSOL supplies EPC- and utility-approved switchyard steel with GA drawings, BOM, material test certificates and galvanising reports, under an ISO 9001 system, with CPRI-tested isolator-equipment heritage.
Yes. Every portal, isolator support and equipment-mounting structure is detailed to the specific bay layout, equipment make, clearances and loading of your switchyard.
Build your switchyard with ENSOL steel
Share your switchyard layout, voltage class and equipment schedule — we respond with structural design, fabrication and galvanising under one roof. Power T&D — Prashant · +91-99775-33990