New Generation Composite Suspension Insulator Complies with IEC 61109 Standard, Supporting Reliable Power Transmission Networks
With the rapid development of global power infrastructure, modern transmission systems require insulation equipment with higher reliability, improved environmental resistance, and enhanced long-term performance. A new generation of Composite Suspension Insulators designed in accordance with IEC 61109:2025 – Composite insulators for AC and DC overhead lines with a nominal voltage greater than 1 000 V – Definitions, test methods and acceptance criteria is now contributing to safer and more efficient high-voltage transmission solutions.
Designed According to IEC 61109 International Requirements
The new Composite Suspension Insulator adopts an advanced composite structure consisting of a high-strength fiberglass reinforced polymer (FRP) core rod, weather-resistant silicone rubber housing, and corrosion-resistant metal end fittings.
In accordance with IEC 61109, composite suspension insulators are evaluated based on their mechanical, electrical, and environmental performance. The product development process focuses on ensuring:
- Mechanical tensile strength and load-bearing capability
- Electrical insulation performance under high-voltage conditions
- Reliable sealing and interface protection between components
- Long-term resistance to aging and environmental stress
- Compliance with type tests, sample tests, and routine inspection requirements
Through strict quality control and laboratory verification, the insulator delivers stable performance for demanding overhead transmission applications.
Advanced Performance for Modern Transmission Systems
Compared with traditional porcelain insulators, Composite Suspension Insulators provide significant advantages in weight reduction, pollution resistance, installation efficiency, and operational reliability.
High Mechanical Strength
The FRP core rod provides excellent tensile strength and mechanical stability, enabling reliable operation under continuous line loads and severe weather conditions.
Superior Pollution and Weather Resistance
The silicone rubber housing features excellent hydrophobic properties, helping reduce leakage current and flashover risks in coastal, industrial, and heavily polluted environments.
Lightweight and Efficient Installation
The composite structure significantly reduces product weight compared with conventional ceramic alternatives, lowering transportation costs and simplifying installation and maintenance operations.
Long-Term Operational Reliability
By applying IEC 61109 testing procedures, the insulator’s electrical performance, mechanical strength, material interface integrity, and aging resistance are comprehensively verified to support long service life.
Supporting the Future of Smart Grid Development
As renewable energy integration, ultra-high-voltage transmission projects, and smart grid infrastructure continue to expand, reliable insulation technology has become increasingly important.
IEC 61109-compliant Composite Suspension Insulators are widely suitable for:
- High-voltage and extra-high-voltage overhead transmission lines
- Renewable energy power transmission projects
- Coastal and high-humidity environments
- Areas with severe industrial pollution
- AC and DC transmission applications
The adoption of advanced composite insulation technology is accelerating the transformation of transmission networks toward higher reliability, lighter structures, and improved operational efficiency.
Supporting the Development of Smart and Renewable Energy Grids
With the rapid expansion of wind power, solar energy, and long-distance power transmission projects, reliable insulation solutions have become increasingly important.
Composite Suspension Insulators are widely applied in:
- High-voltage AC transmission lines
- HVDC transmission projects
- Renewable energy grid connection systems
- Coastal and high-pollution areas
- Upgrading and modernization of existing transmission networks
Their combination of lightweight design, high mechanical strength, and excellent pollution performance makes them an essential component in the development of modern smart grids.
About IEC 61109
IEC 61109 is an internationally recognized standard developed by the International Electrotechnical Commission (IEC) for composite suspension and tension insulators used in overhead power lines. The standard defines product requirements, test methods, and acceptance criteria to ensure the quality and reliability of composite insulators used in modern electrical networks.
