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We are Hengshui Ruibin New Materials LLC, a professional manufacturer specialized in composite profiles. The FRP round tube for electrical insulation applications on 330kV transformer bushing support is a key structural component designed to combine high dielectric performance with dependable mechanical strength. Manufactured through a continuous pultrusion process, this glass fiber reinforced plastic tube delivers stable electrical insulation and strong load-bearing capacity for high-voltage power systems. Whether used in new transformer installations or as a replacement support component, it helps engineers achieve safe and reliable bushing arrangements with simplified handling and installation.
What This FRP Round Tube Offers
This round tube is developed specifically for transformer bushing support structures operating at 330kV class levels. Its design focuses on the two most important requirements for this application: dependable insulation in high electric field regions and consistent mechanical support over long service life. The material composition is selected to provide stable behavior under both electrical and structural stress, making it a practical choice for switchgear manufacturers, transformer maintenance teams and electrical equipment integrators.
This tube is produced in round cross-section profiles, which provide uniform stress distribution when installed around the bushing axis. The circular geometry also makes it easier to achieve consistent clearance between the conductor and grounded parts, a critical factor for 330kV insulation coordination.
Key Features and Benefits
- High dielectric strength – the FRP formulation provides effective electrical insulation suitable for high voltage bushing support structures.
- Excellent mechanical stability – the pultruded structure offers good axial strength and rigidity for supporting bushing components under operational loads.
- Lightweight design – compared with conventional ceramic or metal support parts, the composite tube is easier to transport, assemble and replace.
- Smooth and dense surface – helps reduce surface discharge risk and limit moisture absorption in outdoor or humid environments.
- Corrosion resistance – resistant to moisture, atmospheric contaminants and common chemicals, maintaining performance over years of service.
- Good dimensional stability – close tolerance profiles keep a reliable fit with bushing connection assemblies and mounting frames.
- Machinability – can be cut, drilled or shaped with standard workshop tools, allowing quick on-site modifications.
- Customizable dimensions – diameter, wall thickness, length and color can be adapted according to project design requirements.
Technical Specifications
The table below summarizes the main characteristics of this FRP round tube. Detailed drawings and performance reports can be discussed with our engineering team according to your specific application.
| Material | FRP (glass fiber reinforced plastic) |
| Manufacturing process | Pultrusion |
| Primary function | Electrical insulation and structural support |
| Application level | 330kV class transformer bushing support |
| Diameter | Customizable based on bushing design |
| Wall thickness | Customizable |
| Length | Custom lengths available |
| Color | Customizable |
| Surface finish | Smooth, low-absorption surface |
| Quality control | In-house inspection and reports available on request |
Designed for 330kV Transformer Bushing Support
In a 330kV transformer, the bushing support tube is not only a spacer but also an insulation component that must withstand high potential differences between the conductor and the transformer tank. This FRP round tube is engineered with these conditions in mind. Its high dielectric strength reduces the risk of leakage current and partial discharge along the support path. The pultruded fiber orientation provides good bending and compression resistance, helping the bushing stay stable during operation, transport and temperature changes.
Because every transformer design can be different, we produce this tube as a configurable profile rather than a fixed part number. This gives your engineering team the freedom to specify the exact dimensions needed for your bushing assembly. It also simplifies inventory management for maintenance departments, as the tubes can be supplied in matching lengths and diameters for multiple units in one station.
For equipment manufacturers, using a lightweight FRP support tube can reduce overall transformer assembly weight, making transport and installation more convenient. The material also does not corrode like metal parts, which helps reduce maintenance frequency in humid or coastal regions.
Customization and Ordering Information
- Diameter, wall thickness and length can be customized according to your structural drawings.
- Color options are available upon request, including standard light gray and customized colors.
- Small trial orders are welcome for product evaluation before mass production.
- Ports of shipment are Tianjin and Qingdao, offering convenient export logistics.
Quality Assurance
All FRP round tubes are checked during the pultrusion process for surface integrity, dimensional consistency and overall appearance. After production, each batch is inspected before packing to reduce the risk of defects reaching your site. Packaging is designed for export protection, with wooden cases or foam wrapping available according to order size.
About Hengshui Ruibin New Materials LLC
We are a specialized manufacturer of FRP composite products, located in Hengshui, Hebei, China. Since our establishment in 2019, we have developed a production facility covering 1,000-3,000 square meters and built an annual export value of roughly US$2.5 million to US$5 million. Our team of 101-200 employees works under a disciplined production system to maintain stable quality and responsive support. We serve customers across North America, South America, Eastern and Western Europe, Southeast Asia, Africa, Oceania, the Middle East and many other markets. For every order, our goal is to combine competitive pricing with reliable product performance and on-time delivery.
Frequently Asked Questions
Q: Can this FRP round tube be used in outdoor transformer installations?
A: Yes. The FRP material has low moisture absorption and good resistance to atmospheric conditions. If the installation area has strong UV exposure, please let us know so we can recommend a suitable resin system for enhanced outdoor durability.
Q: How does the tube perform in 330kV bushing support applications?
A: The tube is designed for electrical insulation and mechanical support in high voltage equipment. Pultruded FRP provides high dielectric strength and stable mechanical properties. For specific engineering review, we can share test reports and technical data upon request.
Q: Can you supply custom diameters and lengths?
A: Absolutely. As a manufacturer, we can adjust the diameter, wall thickness and length according to your drawings or sample requirements. This makes it easier to match your existing bushing support design.
Q: Is the surface smooth enough for high voltage insulation?
A: The pultrusion process produces a dense and smooth surface, which helps reduce surface discharge risk. If your project needs a special surface finish, let us know and we can discuss available options.
Q: Do you provide material test reports?
A: Yes, inspection records and material test reports can be prepared upon request. Please specify which tests your project requires so our team can arrange them accordingly.
Q: What is the minimum order quantity?
A: The MOQ depends on the selected dimensions and customization level. We welcome small trial orders so you can verify the quality before committing to bulk quantities.
Q: How are international orders delivered?
A: Our usual ports of shipment are Tianjin and Qingdao. We work with reliable freight forwarders to support sea, air or railway delivery according to your destination and schedule.
Q: Do you offer after-sales technical support?
A: Yes, our technical team can assist with product selection, dimensional confirmation and installation advice based on your bushing support structure design.
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