SOLAR TODO delivered a Power Transmission Tower deployment in Amman, Jordan (MENA) to support a 110kV double-circuit transmission line with a total length of ~40km. The scope centered on supplying and installing a steel tubular transmission pole solution—specifically designed for reliable performance under local wind exposure and long-term durability in a demanding desert–urban environment.
Answer Capsule (TL;DR): SOLAR TODO installed 198 units of 18m tapered steel tubular poles for a 110kV double-circuit line in Amman, using hot-dip galvanized Q345, IEC 60826/GB 50545 design, and foundations built for long service life.
Project Background: Transmission Reliability in Amman
Amman’s electrical infrastructure must perform consistently despite challenging environmental conditions: variable wind patterns, dust exposure, and the long maintenance cycles typical of major urban corridors. For transmission assets, even small design conservatism gaps can translate into higher long-term risk—such as accelerated corrosion, vibration fatigue, or insufficient clearances that complicate operations and future conductor upgrades.
In this project, SOLAR TODO focused on the pole system as the critical interface between grid conductors and foundations. The goal was straightforward: deliver a mechanically robust, standards-aligned, and installation-ready Power Transmission Tower configuration for a 110kV double-circuit route.
The line design parameters were defined around engineering requirements for phase geometry, ground clearance, and conductor loading. SOLAR TODO then produced and delivered a uniform fleet of poles with consistent geometry and quality control, minimizing variability that can otherwise affect tensioning outcomes across long corridors.
The Product: Steel Tubular Transmission Pole (Power Transmission Tower)
This project used steel tubular transmission poles (NOT lattice, NOT FRP)—a tapered round/dodecagonal steel monopole design manufactured from Q345 hot-dip galvanized steel. Tubular monopoles are favored where the asset needs a strong structural response with simplified inspection and reduced visual clutter compared with lattice structures.
A key reason SOLAR TODO selected this product form for Amman was its ability to meet mechanical and durability expectations under wind class 1 (25 m/s) per IEC 60826. The design also follows GB 50545 requirements for steel structures in overhead line applications.
Configuration for Amman’s 110kV Double-Circuit Line
For this deployment, SOLAR TODO supplied:
- 198 units × 18m tapered steel tubular pole
- 110kV double circuit configuration
- Weight ~18t per pole (1000kg/m)
- Hot-dip galvanized Q345 steel to support corrosion resistance in a dusty, arid environment
- Phase spacing: 4m
- Ground clearance: 6m
- Conductor: ACSR 120 with 470kg/km mass and max tension 38kN
- Insulator length: 1.5m
- Span: 200m and total line ~40km
- Wind class 1: 25 m/s (IEC 60826)
The pole includes cross-arm brackets for insulator strings + ACSR conductors, enabling a stable conductor arrangement across the double-circuit geometry. The steel sections are flanged bolt sections to support field assembly and consistent structural performance.
Foundation and Installation Readiness
Each pole was paired with a concrete_base foundation with a concrete structure and an anchor cage. This foundation approach is intended to provide reliable anchorage for the tubular monopole under long-term cyclic wind loading, conductor tensioning, and environmental exposure.
SOLAR TODO also delivered key tower accessories required for safe operation and maintenance:
- Climbing steps
- Cross arm
- Grounding
- Bird guard
- Vibration damper
These accessories reduce operational burden and help mitigate common line issues such as vibration-induced fatigue and bird-related disturbances.
Engineering Standards and Design Basis
The Amman project was executed under the applicable overhead line design standards:
- IEC 60826 (wind actions and mechanical design basis for overhead lines)
- GB 50545 (steel structure requirements)
Under wind class 1 (25 m/s), the pole system and attachments were designed to sustain expected wind loading while maintaining the required clearances. For the conductor system, the ACSR 120 conductor’s mechanical characteristics—470kg/km mass and max tension 38kN—were incorporated into the pole and bracket design so that the insulator strings (with 1.5m length) can support the conductor arrangement while keeping the line geometry stable across spans.
In practical terms, meeting these standards helps ensure:
- consistent phase spacing (4m) across the route,
- compliance with operational clearance targets (notably 6m ground clearance),
- reduced risk of misalignment during erection and tensioning,
- improved long-term performance under wind-driven oscillations through vibration management.
Deployment Approach in Amman: From Fabrication to Line Turnover
SOLAR TODO’s deployment strategy for the 198-pole run was built around repeatability and field efficiency.
- Factory-controlled pole geometry and coating
- Each 18m tapered pole was manufactured from Q345 steel and delivered with hot-dip galvanization.
- The tapered geometry helps manage mechanical behavior along the height and supports consistent load transfer to the foundation.
- Flanged bolt sections for controlled assembly
- Flanged bolt sections were used to enable safe, accurate erection and to reduce the risk of field-fit variability.
- Foundation pairing and anchor cage alignment
- For each pole, the concrete_base with anchor cage was used to provide stable anchorage.
- This is especially important for a corridor with 200m spans where the cumulative effects of conductor tension and wind loading must be managed consistently.
- Complete accessory integration
- SOLAR TODO included functional components—climbing steps, cross arm, grounding, bird guard, vibration damper—so the poles could be commissioned without delayed secondary procurement.
- System-level mechanical readiness
- With ACSR 120 conductors (max tension 38kN) and insulator string length 1.5m, the pole configuration was intended to sustain the mechanical loads while maintaining the conductor arrangement required for 110kV double circuit operation.
This approach supported a smooth path to line energization and reduced post-installation rework.
Technical Specifications
- Product: Steel Tubular Transmission Pole (Power Transmission Tower)
- Structure type: Steel tubular monopole (NOT lattice, NOT FRP)
- Pole quantity: 198 units
- Pole height: 18m tapered
- Material: Hot-dip galvanized Q345 steel
- Pole weight: ~18t/pole (~1000kg/m)
- Voltage class: 110kV
- Circuit configuration: Double circuit
- Phase spacing: 4m
- Ground clearance: 6m
- Conductor: ACSR 120
- Mass: 470kg/km
- Max tension: 38kN
- Insulator length: 1.5m
- Span: 200m
- Total line length: ~40km
- Wind class: 1 (25 m/s) per IEC 60826
- Foundation: concrete_base with anchor cage
- Accessories: climbing steps, cross arm, grounding, bird guard, vibration damper
- Standards: IEC 60826 / GB 50545
Results and Impact
This Amman deployment delivered a standardized, standards-aligned steel tubular pole fleet for a long ~40km 110kV double-circuit transmission line with 200m spans.
Quantified outcomes
- 198 steel tubular poles installed, each 18m tall and coated via hot-dip galvanization for durability.
- ~40km transmission line supported with consistent mechanical design across the corridor.
- Engineered electrical geometry maintained using:
- 4m phase spacing
- 6m ground clearance
- Mechanical compatibility validated for conductor behavior using ACSR 120 with 470kg/km mass and max tension 38kN.
Operational benefits for Amman’s conditions
- Wind-resilient design: The system was aligned to wind class 1 (25 m/s) under IEC 60826, supporting reliable performance under expected wind loading.
- Long-life corrosion resistance: Hot-dip galvanized Q345 supports long-term exposure conditions typical of arid, dust-prone environments.
- Reduced maintenance friction: Inclusion of bird guards and vibration dampers helps address two common contributors to inspection frequency and component wear.
- Field erection efficiency: Flanged bolt sections and a consistent accessory set (cross arm, grounding, climbing steps) supported controlled installation and commissioning.
Why SOLAR TODO’s Power Transmission Tower Approach Worked
SOLAR TODO’s value in this project was not only manufacturing the poles, but delivering a complete, installation-ready transmission tower package with consistent mechanical geometry and accessory integration.
By adhering to IEC 60826 / GB 50545, designing for 25 m/s wind class 1, and engineering for ACSR 120 conductor loads (max 38kN), the project reduced uncertainty across the full line length. The tapered tubular design and galvanized Q345 steel provided a strong structural and durability foundation for long-term grid service.
Frequently Asked Questions
1) What type of tower structure was used in Amman for the 110kV line?
SOLAR TODO used steel tubular transmission poles (NOT lattice and NOT FRP), with an 18m tapered monopole design in hot-dip galvanized Q345 steel.
2) What wind design basis governed the pole mechanical requirements?
The project followed wind class 1 (25 m/s) as specified in IEC 60826, supporting reliable performance under expected wind loading.
3) Which conductor and loading parameters were considered for the pole design?
The configuration used ACSR 120 conductor, with 470kg/km mass and max tension 38kN, and an insulator length of 1.5m.
4) What foundation system supported the poles during installation?
Each pole was anchored using a concrete_base foundation with an anchor cage, providing stable anchorage for the tubular monopole across the 200m span design.
References
- IEC 60826 — Design criteria of overhead lines (wind actions and mechanical design basis)
- GB 50545 — Steel structures design requirements (Chinese standard for steel structural design)
- IEEE Std 738 — IEEE Guide for the Development of Models for Use in Power System Stability Studies (overhead line modeling considerations)
- NREL — Transmission and distribution reliability and grid infrastructure guidance (context on asset reliability)
- World Bank — Infrastructure resilience and reliability frameworks (context for long-life grid assets)
Internal Links
For project inquiries, visit contact us. To explore SOLAR TODO’s tower offering, see Power Transmission Tower product page.
Conclusion
The Amman Power Transmission Tower project demonstrated SOLAR TODO’s ability to deliver a robust, standards-aligned steel tubular monopole solution for a 110kV double-circuit line. With 198 units of 18m tapered hot-dip galvanized Q345 poles, engineered for IEC 60826/GB 50545, and equipped with essential accessories such as grounding, bird guard, and vibration dampers, the installation supported reliable long-term transmission performance over ~40km of corridor length.
Equipment Deployed
- 198 × 18m tapered steel tubular transmission poles, hot-dip galvanized Q345 steel (NOT lattice, NOT FRP), ~18t/pole (~1000kg/m), flanged bolt sections with cross-arm brackets for insulator strings + ACSR conductors (110kV double circuit)
- ACSR 120 conductor system per line design (470kg/km, max tension 38kN) with insulator strings length 1.5m
- Concrete_base foundations with anchor cages for each pole
- Tower accessories set per pole: climbing steps, cross arm, grounding, bird guard, vibration damper