Project Overview

The Zhangbei – Zhangnan 500kV Double-Circuit Transmission Line Project is a core component of the Zhangjiakou Zhangbei–Shangyi–Kangbao 500kV Transmission and Transformation Program, also referred to as the “Three Power Four Line” initiative. Developed under the State Grid Corporation’s broader strategy, the project facilitates the large-scale integration of wind power into the national grid, supporting regional development and clean energy goals.

Project Highlights

• Voltage Level: 500kV

• Transmission Type: Double Circuit on Same Tower

• Core Function: Transmission of renewable energy, especially wind power

• Regional Benefit: Strengthens grid stability in Northern China

The project plays an important role in improving transmission capacity, supporting the consumption of clean energy, and enhancing the resilience of the power grid.

Construction Plan & Execution

1. Route Planning & Environmental Considerations

Traversing plains, hills, and high-altitude zones, the line required:

• Detailed topographical and geological surveys for optimal tower siting

• Wind load and extreme weather assessments, particularly in high-wind areas

• Environmental studies to reduce impact on grasslands and wildlife habitats

GIS technology was used to determine an efficient and environmentally sensitive route.

2. Tower Construction & Foundation Engineering

To address terrain complexity and strong wind conditions, the following measures were implemented:

• Steel lattice towers with aerodynamic profiles and corrosion-resistant materials

• Foundation solutions adapted to site conditions:

• Deep-pile foundations in loose soils

• Rock-anchored foundations in mountainous areas

• Reinforced concrete bases in high-wind zones

Helicopter-assisted tower installation was applied in remote areas to enhance efficiency and reduce ground disturbance.

3. Conductor Installation & Stringing

The transmission system employs:

• High-performance aluminum alloy conductors to reduce transmission losses

• Composite insulators resistant to temperature and weather fluctuations

• Electromagnetic shielding to minimize interference with nearby infrastructure

Tension stringing methods ensured accurate alignment and enhanced system performance.

4. Grid Integration & Renewable Energy Transmission

This line connects major wind farms in Zhangjiakou to the wider grid, enabling:

• Large-scale renewable energy delivery

• Voltage regulation through reactive power compensation

• Real-time protection via advanced automation systems

The project supports renewable energy development while contributing to national carbon reduction targets.

Design & Technical Services

1. System Studies & Performance Optimization

Our engineering team conducted:

• Load flow analysis to optimize transmission paths

• Electromagnetic safety evaluations

• Grid stability simulations to prevent voltage fluctuations

2. Digital Monitoring & Control

To improve operational efficiency, the project features:

• SCADA systems for real-time data monitoring and control

• AI-based predictive maintenance to detect potential faults

• Automated protection systems for fault isolation and recovery

3. Environmental & Safety Compliance

Sustainable design and safety measures include:

• Bird flight diverters along migratory paths

• Low-noise technology near residential areas

• Lightning protection and grounding systems to safeguard equipment

After-Sales Service & Maintenance

1. Routine Monitoring & Preventive Maintenance

• Drone inspections for real-time tower and line assessment

• Structural checks on towers and foundations

• Corrosion protection and periodic servicing to extend equipment life

2. Emergency Response & Operational Support

A dedicated team provides 24/7 support for:

• Weather-related incidents, such as high winds or ice storms

• Sudden load changes and system faults

• Cybersecurity and control system alerts

3. Expansion & Upgrade Services

To support future energy needs, we offer:

• Transmission line and transformer upgrades

• Hybrid AC/DC systems for improved efficiency

• Integration pathways for future solar or offshore wind capacity

4. Training & Technical Support

• On-site and virtual training for grid operation teams

• Workshops on UHV system maintenance and fault handling

• Ongoing technical consulting for system upgrades and grid modernization

Conclusion

The Zhangbei – Zhangnan 500kV Double-Circuit Transmission Line Project is a strategic link in China’s clean energy infrastructure. By enabling large-scale wind power integration and applying advanced grid technologies, the project enhances grid reliability while supporting the shift to sustainable energy.

With strong capabilities in high-voltage engineering, digital grid integration, and long-term maintenance, we deliver practical, forward-looking transmission solutions tailored to the evolving energy landscape.

For more information on transmission projects, grid services, or technical support, please contact us.