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High Voltage Transmission Tower
High voltage transmission towers are high-strength, large-span steel structures engineered for transmission lines of 110kV and above. Compared with distribution lines and low-voltage transmission towers, they are subject to significantly higher conductor tension, greater ice loads, and harsher weather conditions, and are therefore designed with more stringent structural and material standards.
Features
High voltage transmission towers are high-strength, large-span steel structures engineered for transmission lines of 110kV and above. Compared with distribution lines and low-voltage transmission towers, they are subject to significantly higher conductor tension, greater ice loads, and harsher weather conditions, and are therefore designed with more stringent structural and material standards.
Product Types
Our high voltage transmission tower products focus on five mainstream voltage classes: 110kV, 220kV, 330kV, 500kV, and 750kV, covering the full range of tower types from conventional tangent (suspension) towers to river-crossing large-span towers. Structural designs can be customized according to each project's conductor bundle configuration, insulator string arrangement, and terrain conditions.
Product Features
High-Load Structural Design
To withstand the vertical loads and horizontal tensions imposed by large cross-section conductors and multi-bundle conductor configurations (2-bundle / 4-bundle / 6-bundle / 8-bundle) on high-voltage lines, the main members are fabricated from Q355B/Q420B high-strength steel, with reinforced design applied to critical load-bearing zones to ensure an adequate structural safety margin.
Multiple Conductor Arrangements
Supports various conductor configurations including horizontal, triangular, vertical, barrel (drum), and umbrella-type arrangements, coordinated with the insulation coordination requirements of different voltage classes to optimize tower head dimensions and right-of-way (corridor) width.
Large-Span Special Capability
With proven design and manufacturing experience in river-crossing, river-spanning, and valley-crossing large-span towers, tower heights can reach 200m and above, capable of withstanding extraordinary loads over long spans, with tension-section (dead-end section) design to ensure line safety.
Adaptability to Complex Working Conditions
Dedicated load calculations and upgraded anti-corrosion designs are provided for special conditions including heavy-ice zones (10mm–30mm ice thickness), high altitudes (above 3,000m), strong-wind areas (wind speeds above 35m/s), and coastal salt-fog environments.
Product Technical Parameters
|
Item |
Parameter |
|
Applicable Voltage Class |
110kV – 750kV |
|
Tower Height Range |
15m – 200m+ (large-crossing towers can be higher) |
|
Circuit Configuration |
Single-circuit / double-circuit on same tower / multi-circuit |
|
Conductor Split Number |
2-split / 4-split / 6-split / 8-split (per design) |
|
Design Wind Speed |
25m/s – 40m/s (per project meteorological conditions) |
|
Design Ice Load |
10mm – 30mm (special reinforcement available for heavy-ice areas) |
|
Main Member Material |
Q355B/Q420B high-strength low-alloy steel |
|
Galvanizing Standard |
ISO 1461, coating thickness 85 – 110μm |
Manufacturing Capability
- Detailed Engineering (Detailing/Development): Based on design drawings, 1:1 shop detailing and member numbering are carried out to ensure machining accuracy and on-site assembly consistency.
- CNC Machining: Equipped with CNC angle steel production lines, CNC flat-bed drilling machines, and automatic welding production lines, key components are processed by mechanized equipment to minimize human error.
- Hot-Dip Galvanizing: With our in-house galvanizing line, the zinc bath temperature, immersion time, and cooling process are strictly controlled to ensure coating thickness and adhesion meet the required standards.
Typical Engineering Application Scenarios
State Grid 500kV / 750kV backbone transmission corridors
Inter-regional power interconnection projects (e.g., West-to-East Power Transmission, North-to-South Power Transmission)
Transmission lines for large-scale hydropower / thermal power / nuclear power bases.
Collector and transmission projects for gigawatt-level wind power and photovoltaic (solar) bases.
River-crossing, river-spanning, and valley-crossing large-span transmission projects.
Dedicated transmission lines for heavy-ice zones and high-altitude regions.
220kV outer-ring and substation access/egress lines for urban power grids.
FAQ
Q: What is the difference between a high voltage transmission tower and an ordinary transmission tower?
A: Ordinary low voltage / distribution towers are typically made of Q235 steel with relatively simple structures. High voltage transmission towers (110kV and above) must withstand greater conductor tension, heavier ice loads, and more complex meteorological conditions, and therefore have higher requirements in terms of steel grade (Q355/Q420), tower head dimensions, insulator configuration, and structural safety margin.
Q: Can you manufacture 500kV double-circuit towers on a single tower?
A: Yes. We have the design and manufacturing capability for 500kV double-circuit towers on a single tower, supporting vertical or barrel (drum) conductor arrangements. We can fabricate to the design institute's drawings, or optimize the tower head according to right-of-way (corridor) width restrictions.
Q: What is the maximum height of your large-span towers?
A: Our large-span towers can be designed and manufactured to heights of 200m and above, with the specific height determined by the crossing span length, conductor specifications, and meteorological conditions.
Q: How do you handle heavy-ice-zone projects?
A: For heavy-ice-zone projects with 10mm–30mm ice thickness, we perform dedicated ice-load calculations at the design stage, enlarge the cross-sections of critical members, and increase the galvanizing coating thickness to ensure structural safety and corrosion resistance under repeated icing and de-icing cycles.
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