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A PTFE tubular busbar is a high-voltage power transmission device that uses a metal tube (typically copper or aluminum) as the conductor, PTFE-oriented film as the primary insulating medium, and a precision mechanical winding process to build a multi-layer sh...
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EPDM Silicone Rubber Tubular Bus Bar
The EPDM silicone rubber tubular bus bar adopts a composite shielded insulation structural design. Through polymer extrusion technology, the tubular copper or aluminum conductor, conductor shielding, insulation layer, and insulation shielding are co-extruded in a single process, achieving both conductive current-carrying and shielded insulation functions for the wire. The EPDM silicone rubber tubular bus bar is produced using triple-layer co-extrusion technology, ensuring tight and gapless interfaces between the inner and outer shielding layers and the insulation layer. The primary insulation material is ethylene propylene diene monomer (EPDM) rubber, the conductor is a solid copper tube, the metal shielding layer is made of copper foil, the outer sheath is composed of polyolefin polymer insulation, and the joints feature a shielded design to achieve full insulation along the entire line.
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Technical Advantages
Triple-Layer Co-Extrusion Technology: The conductor shielding, insulation layer, and insulation shielding are extruded and formed simultaneously, ensuring tight and gapless interfaces between layers, significantly enhancing the overall product performance.
Optimized Electric Field Design: The terminals employ a prefabricated cold-shrink structure, which redistributes the electric field at voltage concentration points through stress cones, reduces electric field intensity, and minimizes discharge and insulation damage.
Reliable Connection and Current-Carrying Capacity: Terminal adapters enable a smooth transition from the circular copper tube conductor to flexible expansion joints, reducing temperature rise at the ends and ensuring the conductor’s current-carrying capacity. Intermediate joints use stainless steel inner sleeve connections for conductors, secured externally with two semi-circular connecting bus bars, and tightened and welded using four stainless steel C-clamp specialized tools, ensuring conductor current-carrying capacity and preventing deformation.
Compact and Waterproof Structure: Joints are compact and easy to install. Specially waterproofed intermediate joints support the short-term submersion operation of the bus bar.
| Product structure and requirements | |
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The composite shielded insulated tubular busbar is a combination of a tubular (copper or aluminium) busbar conductor and a conductor shield, insulation, insulation shield, etc., extruded by polymer to realise the conduction current and shielding insulation of the busbar. Main raw material selection: conductor copper hard tube (specially customised), inner screen, outer screen, an EPDM rubber, a metal shielding layer, a copper foil, an outer sheath, and a polyolefin polymer insulation. Core technology: three-layer co-extrusion technology -extrusion quality assurance, the interface between the internal and external shielding and insulation is tight without a gap, which greatly improves the performance of the insulated tube bus; Insulated tube busbar joint technology adopts shielded tube joint to make the product complete. |
| Product structure drawing |
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| Advantages of the extruded insulated tube type busbar |
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| The terminal adapter connects the round conductor copper pipe with the soft expansion joint connection end, achieving a smooth transition from round to square, reducing the end temperature rise, and ensuring the conductor current carrying capacity. The stress cone is used to change the electric field distribution at the voltage concentration of the prefabricated cold shrink terminal, reduce the electric field intensity, reduce the product discharge, reduce the insulation damage, improve the performance of the tube bus, ensure the operation life of the tube bus, and reduce the breakdown accident rate. |
| Production technology of insulated tube-type busbar |
| Advantages of the joint: small structure, easy to install, after special treatment can be immersed in water for a short time, by changing the geometric shape of the tube busbar joint voltage concentration to change the electric field distribution, reduce the electric field strength, in order to reduce the possibility of corona generation, reduce insulation damage, improve the performance of the tube busbar, ensure the operating life of the tube busbar, reduce the breakdown accident rate. |
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| General rules |
| This technical specification is applicable to the composite shielding fully insulated copper bus bar, and puts forward the technical requirements in terms of function, structure, performance, installation and test. This technical specification is the minimum technical requirements, does not specify all technical details, and does not fully quote the provisions of the relevant standards and specifications. The contractor shall provide high-quality products in accordance with this technical specification and relevant national standards. |
| Typical application solutions for insulated tube busbars |
| Method 1: Connect the main transformer to the control room This is the most common way of tubular busbar application. The busbar is directly connected from the low-voltage terminals of the main transformer to the switch cabinet terminals in the control room. Main advantages: Suitable for large currents. The wiring is clear and beautiful, and can be fully insulated or semi-insulated. |
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| Method 2: The busbar is routed through a cable trench or cable mezzanine The figure below is another common way of applying tubular busbars. The busbars can be connected to switch cabinets through underground cable trenches or cable mezzanines, and can also be used for connections between switch cabinets. This busbar is fully insulated and is particularly suitable for situations where wiring is difficult. |
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| Method 3:Tubular busbars are routed through cable trenches or cable mezzanines This method is the top cable connection method of the switch cabinet. It can also be connected through the cable mezzanine and the bottom cable connection method. Users can choose according to the actual situation. The busbar type is fully insulated. |
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| Method 4:Tubular bus CNC monitoring system Our company develops it by itself and implements unmanned intelligent monitoring of multiple technical data of the tube bus. |
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| Insulated tube busbar |
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Advantages of Prefabricated Cold-Shrink Intermediate Joints
Compact structure, easy to install.
Alters the electric field distribution at voltage concentration points of the tubular bus bar joint by modifying its geometric shape, thereby reducing electric field intensity.
Aims to minimize the likelihood of corona discharge, reduce insulation damage, and improve the performance of the tubular bus bar.
Ensures the operational lifespan of the tubular bus bar and reduces the incidence of breakdown accidents.
Direct contact between conductors is achieved through stainless steel inner sleeves, connected externally with two semi-circular bus bars. Four stainless steel C-clamps are tightened and welded using specialized tool molds, ensuring conductor current-carrying capacity and preventing deformation.
After waterproof treatment, intermediate joints allow the bus bar to operate briefly while submerged in water.
About Us
Jiangsu Wopeng Power Technology Co., Ltd.
Founded in June 2018, Jiangsu Wopeng Power Technology Co., Ltd. is a Custom EPDM Silicone Rubber Tubular Bus Bar Manufacturer and OEM High Voltage EPDM Silicone Rubber Tubular Bus Bar Factory, it has rapidly grown into a specialized high-tech enterprise in the field of high and low voltage busbar systems.
We gather a professional team of industry experts, senior engineering and technical personnel, and experienced production specialists who have been engaged in power equipment technology for many years.
Our main products include copper & aluminum tube busbars, wind power tube busbars, intensive (compact) busbars and sliding contact line systems. We focus on the R&D and manufacturing of 0.4 kV–35 kV fully insulated enclosed tube busbars and low-voltage cast resin busway systems, providing reliable power transmission paths for power plants, substations, wind farms, rail transit and industrial facilities.
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Fully Insulated Tubular Bus Bar Industry knowledge
1. What Is EPDM Silicone Rubber Tubular Bus Bar
The EPDM Silicone Rubber Tubular Bus Bar is a specialized insulated conductive component, combining a metal conductor core with an EPDM silicone rubber outer insulation layer. It is designed for high-voltage power distribution systems, integrating excellent insulation, weather resistance, and mechanical durability. A professional EPDM Silicone Rubber Tubular Bus Bar supplier produces products that meet industrial standards, including High voltage EPDM Silicone Rubber Tubular Bus Bar for medium and high-voltage scenarios (10kV-35kV).
(1) Core Structure and Key Traits
The EPDM Silicone Rubber Tubular Bus Bar consists of a copper or aluminum conductor core (conductivity ≥60% IACS) and a 3-8mm thick EPDM silicone rubber insulation layer. It can withstand a breakdown voltage of ≥25kV/mm, working temperature of -40℃ to 120℃, and has excellent resistance to ozone, UV radiation, and chemical corrosion.
2. Main Uses of EPDM Silicone Rubber Tubular Bus Bar
Thanks to its superior insulation and environmental adaptability, the EPDM Silicone Rubber Tubular Bus Bar is widely used in power systems and industrial applications, mainly including:
- Medium and high-voltage substations (10kV-35kV), used for bus bar connections between switchgear, transformers, and circuit breakers.
- Outdoor power distribution systems, adapting to harsh weather such as rain, snow, and strong sunlight.
- Industrial plants (metallurgy, chemical, electronics), where corrosion resistance and insulation stability are required.
- Renewable energy stations (solar, wind), connecting power generation equipment to distribution grids.
A reliable EPDM Silicone Rubber Tubular Bus Bar supplier provides customized specifications to fit different installation spaces and voltage requirements, ensuring safe and stable power transmission.
3. Performance Comparison with Traditional Insulated Bus Bars
| Bus Bar Type | Breakdown Voltage | Weather Resistance | Service Life |
|---|---|---|---|
| EPDM Silicone Rubber Tubular Bus Bar | ≥25kV/mm | Excellent (UV/ozone resistant) | 25-35 years |
| PVC Insulated Bus Bar | ≤15kV/mm | Poor (UV prone to aging) | 10-15 years |
| Ceramic Insulated Bus Bar | ≥30kV/mm | Good (brittle) | 20-25 years |
The High voltage EPDM Silicone Rubber Tubular Bus Bar stands out for its balanced performance—better weather resistance than PVC and higher flexibility than ceramic, making it ideal for outdoor and industrial high-voltage applications.
4. Frequently Asked Questions
Q1: What voltage range is EPDM Silicone Rubber Tubular Bus Bar suitable for?
A: It is mainly used for 10kV-35kV medium and high-voltage power systems, with customized options for higher voltage levels.
Q2: How to select a reliable EPDM Silicone Rubber Tubular Bus Bar supplier?
A: Choose suppliers with insulation performance test reports, stable EPDM material quality, and customized production capabilities.
Q3: Can it be used in coastal or corrosive environments?
A: Yes, its EPDM silicone rubber layer has strong corrosion resistance, suitable for coastal and chemical industrial environments.
Q4: What is the maximum current-carrying capacity of this bus bar?
A: Standard models can carry up to 3000A, with larger capacity options available from professional suppliers.
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+86-180 3625 3000
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No. 8, Yanjin Road, Chengxi Industrial Park, Shanyang Town, Baoying County, Yangzhou City, Jiangsu Province, China
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