Our company is a Polymer Post insulator for electrified railway, 33kv Polymer Pin Insulator, Polymer Tension insulator full-industry service complex with the largest volume, the most complete format, the most complete supporting facilities, and the most development potential. Our products are designed to be high-performing and reliable under a range of conditions. Our products are designed to be both practical and visually appealing.
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 Long Rod 500kv Post Insulator is selling well worldwide thanks to our scientific management practices and the continuous improvement of product quality. We will continue to adhere to the company's business philosophy, continue to provide users with better service, welcome new and old customers to contact us and establish long-term, friendly cooperation. We warmly welcome you to contact us and please feel free to contact us.
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