Driven by science and technology, we continue to develop new energy-saving, environmentally-friendly and efficient 25kV Composite Post Insulators, Composite Post Insulator, Composite horizontal line post insulator to the market to provide customers with more satisfactory products and more considerate services. We believe that as long as we continuously pursue excellence, adhere to the correct values, and serve every customer with care, our company will surely succeed in the market. In order to meet the needs of social development, the company has developed a number of varieties and specifications of products. We have a team of dedicated professionals who are fluent in multiple languages, including English, Mandarin, and Cantonese. In the relationship between individual employees and groups, we insist on people-oriented and respect the different development needs and value demands of individuals.
Wuhan Line Power Transmission and Transformation Co., Ltd. specializes in the production and sale of composite insulators and accessories. As a manufacturing company integrating production, processing, and distribution, we focus on the R&D, manufacturing, and sales of complete sets of composite insulator equipment. With high-quality products, competitive prices, and excellent service, we have earned the trust and praise of customers worldwide.
Our factory is equipped with the most advanced Automatic Silicone Injection Molding Machines and Voice-operated Displacement Crimping Machines, representing the highest level of process technology. We also have 1000 kV Power Frequency Testing Transformers, 1800 kV Impulse Voltage Generator Sets, and 2000 kN Automatic Tensile Test Machines, along with fully equipped Physical and Electrical Laboratories.
We design products according to client requirements and strictly follow international quality standards including IEC 61109, ISO 9001, ISO 14001, and ISO 45001. Our strict quality management system ensures all products meet IEC61109, IEC62231, GB/T19519-2004, GE/T 22079-2005, DL/T810-2002, and other relevant standards.
Technical Drawings & Dimensions
Our composite insulators are made of a glass fiber epoxy core rod, silicone rubber sheds, and metal fittings. The silicone sheds use a full-pressure technique, which solves a key problem – electric spark punctures at the interface – so the insulator stays reliable. The glass fiber rod is connected to the metal fittings with advanced crimping technology, and we have a full automatic ultrasonic system to check for defects. They are strong, compact, lightweight, and look nice. The metal fittings are galvanized to prevent corrosion. Compared with porcelain insulators, they are reliable, make full use of the core rod's strength, and are easier to handle without damage.
| Parameter | Value |
| Rated Voltage | 500 kV |
| Height | 4030 ± 50 mm |
| Specified Mechanical Load (SML) | 70 kN |
| Routine Test Load (RTL) | 35 kN |
| Rod | 24 mm |
| Creepage Distance | 13000 mm |
| Dry Arcing Distance | 3730 mm |
| Lightning Impulse Withstand Voltage | ≥ 2050 kV |
| Switching Impulse Withstand Voltage | ≥ 1240 kV |
| Wet Power Frequency Withstand Voltage (1 min) | ≥ 740 kV |
| Product Standard | IEC 61109 |
| Housing Material | Silicone Rubber |
| Color | Red |
| No. of Sheds | 153 |
packing & Shipping photos
Each container is carefully loaded with our 500kV composite insulators to ensure safe transportation. For example, a standard 40-foot high-cube container can accommodate up to 660 insulators. The insulators are securely packaged, and we always ensure that the packaging effectively protects the products during shipping and handling.
Certifications & Compliance
Wuhan Line power is always pursuing the principle of Quality First and Customers Supreme. Our product has been subjected the test in accordance with IEC 61109-2008, some of the test items are as follows:
Design tests
Tests on interfaces and connections of end fittings
• Pre-stressing – Sudden load release pre-stressing
• Thermal-mechanical pre-stressing
• Water immersion pre-stressing
• Steep-front impulse voltage test
• Dry power-frequency voltage test
Tests on shed and housing material
• Hardness test
• Accelerated weathering test
• Tracking and erosion test
• Flammability test
Tests on the core material
• Dye penetration test
• Water diffusion test
Assembled core load-time test
• Determination of the average failing load of the core of the assembled insulator
• Control of the slope of the strength-time curve of the insulator
Type tests
• Dry lightning impulse withstand voltage test
• Wet power frequency test
• Wet switching impulse withstand voltage test for insulators intended for systems with Um≥300 kV
Sample tests
• Verification of dimensions
• Verification of the end fittings
• Verification of tightness of the inter face between end fittings and insulator housing and of the specified mechanical load, SML
• Galvanizing test
Routine tests
• Mechanical routine test
• Visual examination
Production Equipment
The company owns state-of-the-art Automatic Silicone Injection Molding Machines and Voice-Controlled Displacement Crimping Machines, representing the highest level of process technology in the world.
We are also equipped with a 1000 kV Power Frequency Test Transformer, an 1800 kV Impulse Voltage Generator, and a 2000 kN Automatic Tensile Testing Machine, supported by fully equipped Physical and Electrical Laboratories.
Our company has always been adhering to the service tenet of 'unity, pragmatism, innovation, and integrity'. With high-quality, low-cost products, excellent service, and years of hard work by all employees, our company has developed into a professional manufacturer of Long Rod Composite Suspension Insulators for Transmission Line. We uphold and carry forward the spirit of daring to be the first in the world to explore the development of the industry with revolutionary and leaping innovative ideas. All our customers are located worldwide and are very satisfied because of our excellent price-performance ratio.
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