Project Overview

The 1000kV Huainan–Nanjing–Shanghai Ultra-High Voltage (UHV) AC Transmission and Transformation Project is an important energy infrastructure initiative designed to improve power supply efficiency and grid reliability in Eastern China. The transmission line originates at the Huainan Substation in Anhui Province and extends to the Huxi Substation in Shanghai, utilizing double-circuit towers to support stable and large-scale electricity delivery.

Key Project Highlights

• Total Transmission Length: 759.414 km

• Transmission Capacity: 12,000,000 kVA

• Total Investment: RMB 26.8 billion

• Major River Crossings: Huaihe River, Yangtze River

• New UHV Substations: Nanjing, Taizhou, Suzhou (Jiangsu Province)

• Double-Circuit UHV Transmission: 519.053 km across Huai’an, Taizhou, Yangzhou, Yancheng, Nantong, and Suzhou

This project contributes to the coordinated development of regional power networks, supports energy structure optimization, and facilitates the integration of diversified energy sources in the Yangtze River Delta.

Construction Plan & Execution

1. Route Planning & Geological Assessment

To address complex geographical and environmental conditions, such as river crossings and densely populated areas, the following measures were undertaken:

• Topographical and hydrological studies to guide route selection

• Seismic and wind load assessments to enhance structural safety

• Environmental evaluations to reduce ecological impact

Geographic Information System (GIS) tools were applied to optimize line alignment and minimize land use conflicts.

2. Tower Construction & Structural Engineering

The project adopted double-circuit UHV tower designs incorporating:

• High-strength steel structures adapted for long-distance transmission

• Aerodynamic profiles to mitigate wind-induced vibrations

• Anti-corrosion coatings suitable for coastal and high-humidity zones

Foundation types were selected based on local ground conditions:

• Deep-pile and rock-anchor foundations in soft or uneven terrain

• Bored pile foundations in flood-prone areas

• Reinforced concrete bases to provide stable support in high-load sections

Helicopter-assisted construction was used in select sections to improve safety and efficiency while minimizing surface disruption.

3. Conductor Installation & Stringing

To ensure efficient energy transmission, the project used:

• Low-resistance aluminum conductors to reduce line losses

• High-temperature-resistant composite insulators for operational reliability

• Electromagnetic shielding in urban areas to limit interference

Tension stringing techniques were adopted to maintain conductor accuracy and transmission quality.

4. Substation Construction & Grid Integration

Three new 1000kV substations—Nanjing, Taizhou, and Suzhou—were built to regulate voltage and support seamless integration into the Eastern China grid. Key systems include:

• High-capacity transformers for voltage control

• Reactive power compensation to support grid stability

• Intelligent monitoring and protection for efficient system operation

The project also enhances the interaction between UHV AC and DC systems, contributing to overall grid coordination.

Design & Technical Services

1. System Analysis & Grid Optimization

Engineering support services included:

• Load flow modeling for balanced power distribution

• Electromagnetic field analysis to address safety and compliance in urban settings

• Voltage fluctuation simulations to improve operational stability

2. Smart Grid Integration & Automation

Digital technologies were incorporated to support intelligent grid management:

• SCADA systems for centralized monitoring and control

• Predictive maintenance tools powered by machine learning

• Automated relay protection to support fault identification and recovery

3. Environmental & Safety Measures

To promote sustainability and safety, the project applied:

• Noise control solutions in substations and along transmission corridors

• Avian protection devices such as bird diverters

• Shielding technologies to manage electromagnetic emissions

After-Sales Service & Maintenance

1. Routine Inspection & Preventive Maintenance

Our service plan includes:

• Regular aerial and ground inspections using drones and thermal imaging

• Condition monitoring of transformers and support equipment

• Cleaning and maintenance of high-voltage lines to reduce contamination-related loss

2. Emergency Response & System Support

A responsive support team is available to address:

• Severe weather impacts including storms, lightning, and typhoons

• Equipment failures or performance anomalies

• Cybersecurity alerts affecting operational systems

3. Future Expansion & Upgrades

To meet evolving energy needs, we offer:

• System upgrade solutions for enhanced transmission capacity

• Integration services for new renewable energy sources

• Digital control enhancements for flexible grid management

4. Training & Technical Assistance

We provide capacity-building support including:

• On-site and remote training for operations personnel

• Technical workshops on UHV system management

• Ongoing expert consultation to support grid innovation and development

Conclusion

The 1000kV Huainan–Nanjing–Shanghai UHV AC Transmission and Transformation Project supports the expansion of the regional power network and contributes to the modernization of China’s energy system. Through large-scale power transmission, advanced automation, and grid interconnection, the project strengthens energy supply continuity and helps facilitate a more balanced and flexible grid structure.

With experience in UHV transmission, smart grid deployment, and lifecycle maintenance, we deliver tailored power infrastructure solutions to meet long-term operational goals.

For more information on UHV transmission systems, grid integration services, or technical support, please contact us.