Products Description

| Typical Line Voltage (kV) |
Section Length (mm) |
Dry Arcing Distance (mm) |
Leakage Distance (mm) |
Specified Cantilever Load (SCL, kN) |
Max. Design Cantilever Load (MDCL, kN) |
1min. Power Frequency Withstand Voltage (Wet) (kV) |
Lightning Impulse Withstand Voltage (kV) |
| 69 | 688±15 | 520 | 1465 | 32.9 | 14.7 | 175 | 330 |
Raw Materials
| End Fittings | Core | Sheds and Housing |
| Hot dip galvanized cast iron or cast steel | Epoxy & Glass fiber (ECR is available) |
HTV Silicone Rubber |
| Min. thickness of the galvanization: 86μm | Diameter(mm): Φ38, Φ40, Φ55, Φ70, Φ90, Φ120 | Color: Grey, Red |
Features
Materials: Composite post insulators are made of a fiberglass reinforced polymer (FRP) core, which provides excellent mechanical strength and durability, and a silicone rubber housing, which offers superior weather resistance and pollution resistance.
Design: Composite post insulators are designed to meet international standards, such as IEC and ANSI, and are available in various voltage ratings and lengths to meet specific application requirements.
Performance: Composite post insulators are tested under various conditions, including temperature, humidity, pollution, and mechanical stress, to ensure their reliability and durability in harsh environments.
Certification: Our composite high voltage suspension insulators are certified by international organizations, such as KEMA and CESI, to meet the highest quality and safety standards.
Customization: We offer customized solutions for specific applications, including special designs, dimensions, and colors, to meet customer requirements.
Cost-effectiveness: Composite post insulators offer significant cost savings over traditional porcelain insulators due to their longer service life, lower maintenance requirements, and reduced need for additional support structures.
Company Profile

Wuhan Line Power offer composite line posts for transmission line applications of various voltage classes up to and including 330kV. All of our insulators equip a one-piece, whole injection. This housing is formed onto the core by a compression molding process. Our design, manufacture, testing and quality control provide a unique products that is unparalleled.
We have exported more than thousands of composite vertical line post insulators all over the world, just like New Zealand, Australia, Dominica Republic, Czech, etc, below are some of drawings. The first one is vertical trunnion with base, the second one is vertical trunnion with long bolt, the third one is no base.
Knowledge
Composite line post insulators are an essential component of high voltage power transmission lines. These insulators are used to support and isolate conductors from the tower or pole structure. Unlike traditional porcelain insulators, composite line post insulators are made of high-strength fiberglass rods and silicone rubber material.
The fiberglass rods are pultruded and made into a core, which is then coated with a layer of silicone rubber. This composite material has superior mechanical strength and is highly resistant to weathering, UV radiation, and pollution. Additionally, the silicone rubber coating provides excellent electrical insulation, making these insulators suitable for use in high voltage transmission lines.
One of the key advantages of composite line post insulators is their lightweight design. They are up to 70% lighter than porcelain insulators, making them easier to install and transport. Additionally, their high mechanical strength and resistance to damage make them more durable and longer-lasting than traditional insulators.
Composite line post insulators also have excellent pollution resistance, which is essential for power transmission lines located in highly polluted areas. They are also highly resistant to cracking, chipping, and breaking, which can occur in harsh environmental conditions.
Composite line post insulators are commonly used in medium voltage power transmission lines, as well as in substations and other electrical equipment.
They are an excellent choice for modernizing existing infrastructure or for new installations, where their lightweight design and superior mechanical and electrical properties offer significant advantages over traditional porcelain insulators.
In summary, composite line post insulators offer superior mechanical strength, electrical insulation, and pollution resistance, making them an ideal choice for modern power transmission systems. Their lightweight design, durability, and ease of installation make them a cost-effective and reliable solution for both new installations and retrofits of existing infrastructure.
Composite insulators have become increasingly popular in the power industry due to their many advantages over traditional insulators. These insulators, made from a combination of materials such as silicone rubber and fiberglass rods, offer excellent performance in a variety of applications.
One of the most significant contributions of composite insulators in the power industry is their ability to improve the reliability and safety of power transmission systems. Composite insulators have excellent resistance to weathering, UV radiation, and pollutants, which ensures their long-term performance in harsh environments. This reliability translates to fewer outages, reduced maintenance costs, and increased safety for workers and the public.
Composite insulators are also known for their high mechanical strength and durability, which allows them to withstand extreme temperatures, vibrations, and physical stress. This strength and durability make them ideal for use in high-voltage transmission lines, substation equipment, and other critical applications.
Another contribution of composite insulators in the power industry is their cost-effectiveness. While composite insulators may have a higher upfront cost compared to traditional ceramic or porcelain insulators, they offer significant savings over their lifetime due to their superior performance, longer lifespan, and reduced maintenance requirements.
Furthermore, composite insulators are lightweight and easy to install, which makes them ideal for use in challenging locations and remote areas. They also require less maintenance and can be easily replaced if necessary, reducing downtime and improving system reliability.
In conclusion, composite insulators have made significant contributions to the power industry by improving the reliability, safety, and cost-effectiveness of power transmission systems. As the demand for more efficient and reliable power systems continues to grow, composite insulators will play an increasingly vital role in meeting these needs.
Topics
1. Technical innovations and advancements in composite insulator design and manufacturing processes.
There have been significant advancements in the design and manufacturing of composite insulators, such as improvements in material selection and production techniques. Technical innovations such as high-strength, lightweight materials, advanced molding processes, and improved sealing techniques have resulted in more durable and reliable composite insulators.
2. The performance of composite insulators under various environmental conditions.
Composite insulators are known for their excellent performance under harsh environmental conditions, such as high temperature, high humidity, and high pollution. However, their performance may vary under different environmental conditions, and there is ongoing research to better understand their behavior and improve their performance in extreme environments.
3. The economic benefits of using composite insulators in power transmission and distribution systems.
While the initial cost of composite insulators may be higher than traditional porcelain insulators, their longer lifespan and lower maintenance requirements can result in significant cost savings over the life of the system. Additionally, their lighter weight and ease of installation can result in lower labor and transportation costs.
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