Gantry Structures
Support busbars and incoming/outgoing lines.
AIS Substation
Structures
ZZ Steel provides complete steel structure solutions for AIS (Air Insulated Substation).
Our structures are engineered for safety, reliability and long service life, supporting all major electrical equipment and busbar systems in accordance with international standards.
High Strength
& Stability
& Stability
Corrosion
Protection
Protection
Engineered
for Safety
for Safety
Optimized
Design
Design
Long Service
Life
Life
Product Overview
AIS Substation Structures form the backbone of air insulated substations, providing mechanical support for busbars, electrical equipment and accessories.
Our scope includes design, manufacturing and supply of all kinds of steel structures used in AIS substations up to 800kV.
SystemAIS (Air Insulated Substation)
Voltage LevelUp to 800kV
ApplicationPower Transmission & Distribution
MaterialQ235B / Q355B / ASTM A36 / A572
Structure TypeGantry / Bus Support / Equipment Support / Lightning Mast / Other Structures
Surface TreatmentHot Dip Galvanized / Powder Coated
Galvanizing StandardISO 1461 / ASTM A123
Design StandardIEC 60894 / IEC 61936 / IEEE C37.012 / ASCE 10
Wind SpeedUp to 60m/s
Seismic IntensityUp to 9 degree
Service LifeMore than 30 years
Complete AIS Substation Structure System
Bus Support Structures
Support main busbars and transfer busbars.
Equipment Support Structures
Support circuit breakers, disconnectors, CT/PT, etc.
Switchyard Structures
Portal frames, extension parts and special structures.
Lightning Mast Structures
Protect substation from lightning strikes.
Other Accessories
Cable supports, walkways, platforms, brackets, etc.
Technical Specifications (Example)
| Item | Voltage Level (kV) | Structure Type | Typical Height (m) | Load Capacity (kN) | Material | Surface Treatment | Design Standard |
|---|---|---|---|---|---|---|---|
| Gantry Structure | 66 – 800 | Single / Double / Multi-Span | 6 – 30 | 10 – 200 | Q235B / Q355B | HDG (≥85μm) | IEC 60894 / IEC 61936 |
| Bus Support Structure | 66 – 800 | Single Column / Portal | 6 – 20 | 10 – 150 | Q235B / Q355B | HDG (≥85μm) | IEC 60894 / IEC 61936 |
| Equipment Support Structure | 11 – 800 | Various Types | 3 – 15 | 5 – 100 | Q235B / Q355B | HDG (≥85μm) | IEC 60894 / IEC 61936 |
| Lightning Mast Structure | 11 – 800 | Single Pole / Guyed | 10 – 80 | 5 – 50 | Q235B / Q355B | HDG (≥85μm) | IEC 62305 / GB 50057 |
| Other Accessories | 11 – 800 | Brackets / Walkways / Supports | – | – | Q235B / Q355B | HDG (≥85μm) | IEC / ASTM / GB |
Manufacturing Process
1Raw Material
High-quality steel material inspection.
2Cutting
CNC cutting for precise dimensions.
3Drilling & Punching
Accurate drilling and punching.
4Welding
Automatic welding ensures strong joints.
5Galvanizing
Hot dip galvanizing for corrosion protection.
6Inspection
Strict quality inspection after galvanizing.
7Packing & Delivery
Secure packing and timely shipment.
Project Applications
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