High-Voltage EPDM Silicone Rubber Tubular Bus Bar: Design, Performance, Manufacturing, and Applications

Modern electrical infrastructure requires power transmission equipment that can carry large currents safely while remaining compact, reliable, and adaptable to demanding installation environments. Traditional bare busbars and conventional insulated conductors may become difficult to use when projects require high voltage, limited installation space, strong environmental resistance, and reduced maintenance. The EPDM silicone rubber tubular bus bar provides an integrated solution by combining a tubular copper or aluminum conductor with composite insulation, conductor shielding, insulation shielding, and a protected external sheath.

This type of fully insulated tubular bus bar is designed for medium- and high-voltage distribution systems, substations, industrial facilities, renewable energy installations, and other applications where dependable current transmission is essential. Its composite shielded structure supports electrical safety, controlled electric-field distribution, mechanical protection, and improved environmental adaptability.

The product is manufactured through a triple-layer co-extrusion process. During this process, the conductor shielding, primary insulation layer, and insulation shielding are formed as an integrated structure. The resulting interfaces are tight and substantially free from gaps, helping to improve insulation consistency and reduce the risk of defects caused by separation, air pockets, or uneven layer thickness.

Jiangsu Wopeng Power Technology Co., Ltd. develops and manufactures high- and low-voltage busbar systems, including insulated tubular busbars, copper and aluminum tubular busbars, epoxy resin vacuum-cast tube busbars, low-voltage busways, wind power tube busbars, compact busbar systems, and sliding contact line systems. Its product range covers applications from low voltage to 35 kV and is supported by engineering, production, testing, and technical service capabilities.

1. Overview of the EPDM Silicone Rubber Tubular Bus Bar

The EPDM silicone rubber tubular bus bar is a fully insulated tubular conductor assembly used to transmit electrical current in medium- and high-voltage systems. Its main structure consists of a solid tubular conductor, a conductor shielding layer, a primary insulation layer, an insulation shielding layer, a metal shielding layer, and an external protective sheath. Depending on the system design, the conductor can be manufactured from copper or aluminum.

The primary insulation material is ethylene propylene diene monomer, commonly known as EPDM rubber. In product descriptions, the material may also be referred to as EPDM silicone rubber because the product combines the elastic, weather-resistant characteristics associated with rubber insulation and the electrical performance requirements of insulated tubular busbar systems. The exact material formulation, thickness, and electrical rating should be confirmed according to the project specification and test documentation.

Unlike an exposed busbar, the fully insulated tubular structure does not depend on large air clearances as the primary means of preventing accidental contact. The insulation and shielding system forms a controlled protective envelope around the conductor. This enables the busbar to be installed in locations where space is restricted or where personnel and equipment require enhanced protection from energized conductors.

The tubular conductor also provides useful mechanical and electrical characteristics. Its circular geometry supports efficient current flow, consistent insulation coverage, and a compact installation profile. Copper tubes provide high conductivity and strong mechanical performance, while aluminum tubes can offer lower weight and may be selected where weight reduction and system economics are important.

For medium- and high-voltage applications, the busbar is not simply a metal conductor covered with a basic insulation layer. The shielding arrangement is an important part of the design. The conductor shield helps create a smoother electrical interface around the conductor, while the insulation shield helps control the external electric field. Together with properly designed terminals and joints, these layers support reliable operation under normal voltage and transient electrical conditions.

EPDM Silicone Rubber Tubular Bus Bar

2. Composite Shielded Insulation Structure

The key technical feature of the product is its composite shielded insulation structure. The conductor, shielding layers, insulation, and protective components are designed as a coordinated system rather than as independent parts. This approach improves dimensional consistency and supports better control of the electric field along the entire busbar route.

2.1 Tubular Conductor

The conductor is normally a solid copper tube or aluminum tube manufactured to the required electrical and mechanical dimensions. Copper is selected where high conductivity, compact dimensions, and strong connection performance are priorities. Aluminum may be selected where reduced weight, cost control, or particular system design requirements are important.

A tubular conductor can provide a favorable balance between current-carrying capacity and overall size. Its circular surface is also well suited to the application of concentric insulation and shielding layers. The conductor is processed and inspected before insulation, because surface cleanliness, roundness, dimensional accuracy, and connection quality all influence the final performance of the completed busbar.

2.2 Conductor Shield

The conductor shielding layer provides a controlled interface between the metal conductor and the primary insulation. It helps reduce localized electric-field concentration caused by conductor surface irregularities and supports a more uniform voltage distribution across the insulation system.

In a well-manufactured product, the conductor shield should be continuous and closely integrated with the insulation. Any void, discontinuity, or uncontrolled interface could increase local electrical stress. The triple-layer co-extrusion process is intended to reduce this risk by forming the conductor shield, insulation, and insulation shield in a coordinated operation.

2.3 EPDM Primary Insulation

EPDM rubber is used as the principal insulation material because it offers a combination of dielectric performance, elasticity, environmental resistance, and mechanical flexibility. The insulation layer separates the energized conductor from the outside environment and supports the rated voltage of the busbar system.

EPDM-based insulation is generally resistant to ozone, ultraviolet exposure, moisture, and a range of environmental influences. This makes it suitable for outdoor substations, industrial plants, renewable energy stations, and other locations where the busbar may be exposed to temperature changes, humidity, dust, sunlight, or chemical contaminants.

Product data supplied for a particular project may specify an insulation thickness in the range of approximately 3 to 8 millimeters and a breakdown strength of 25 kV/mm or higher. These values should be treated as design references rather than universal specifications. The actual rating depends on conductor size, voltage class, insulation formulation, test method, shielding configuration, operating environment, and applicable standards.

2.4 Insulation Shield and Metal Shield

The insulation shielding layer helps control the electric field outside the primary insulation. A metal shielding layer, such as copper foil, may be incorporated to provide additional electrical shielding and support grounding or bonding arrangements. The metal shielding configuration must be designed together with the terminal and joint system to ensure continuity and safe fault-current behavior.

Shield continuity is especially important at connection points. A busbar may have excellent insulation along its straight sections but still experience electrical stress if the shielding system is interrupted or poorly transitioned at a joint. For this reason, shielded terminals and intermediate joints are integral components of the complete busbar system.

2.5 External Sheath

The external sheath is formed from a polyolefin polymer insulation material or another approved protective compound specified for the project. It provides additional protection against mechanical damage, moisture, contamination, and environmental exposure. The outer sheath also helps maintain the integrity of the internal insulation and shielding layers during transport, installation, and long-term operation.

3. Triple-Layer Co-Extrusion Manufacturing Technology

The triple-layer co-extrusion process is one of the principal manufacturing advantages of the insulated tubular busbar. In this process, the conductor shielding, primary insulation, and insulation shielding are extruded and formed in one coordinated production operation. The layers are applied under controlled process conditions, allowing the interfaces to remain close, continuous, and substantially gapless.

Conventional multi-stage construction can create risks at the boundaries between separately applied materials. Differences in surface condition, dimensional tolerance, adhesion, temperature, or installation pressure may result in small voids or weak interfaces. The co-extrusion approach reduces the number of independent assembly steps and improves the consistency of the insulation system.

3.1 Material Preparation

Before extrusion, the conductor material and polymer compounds are prepared according to the product specification. Copper or aluminum tubes are checked for dimensional accuracy, surface condition, and cleanliness. EPDM insulation compounds, conductive shielding materials, and external sheath materials are prepared under controlled conditions to maintain consistent processing behavior.

Material traceability is important for high-voltage products. The manufacturer should be able to identify the material batch, processing parameters, production date, and inspection results associated with each finished section. This information supports quality control, technical documentation, and future service requirements.

3.2 Extrusion and Layer Integration

During production, the conductor is guided through the extrusion equipment while the conductor shield, insulation, and insulation shield are applied in a controlled sequence. Temperature, pressure, extrusion speed, centering, and layer thickness are monitored to maintain uniformity.

The objective is to create tight interfaces without air gaps between the internal shield, insulation, and external shield. A stable interface supports consistent dielectric performance and reduces the possibility of partial discharge caused by localized voids. The finished insulated tube must also maintain a smooth external surface and accurate overall diameter so that terminals, joints, clamps, and supports can be installed correctly.

3.3 Cooling, Inspection, and Finishing

After extrusion, the insulated tubular busbar is cooled under controlled conditions. Cooling must be sufficiently uniform to prevent deformation, internal stress, or dimensional instability. The finished section is then cut, marked, and prepared for electrical and mechanical inspection.

Inspection may include visual examination, dimensional measurement, insulation resistance testing, high-voltage withstand testing, conductor resistance verification, shielding continuity checks, and other tests required by the technical specification. For special projects, additional tests may be performed through qualified third-party institutions.

Jiangsu Wopeng Power operates production capabilities that include vacuum casting systems, CNC machining equipment, automated assembly technologies, and standardized inspection processes. These capabilities support the manufacture of multiple busbar product families and allow the company to coordinate conductor preparation, insulation processing, component machining, and final assembly.

4. Electrical and Mechanical Advantages

The EPDM silicone rubber tubular bus bar combines several advantages that are valuable in medium- and high-voltage applications. These advantages relate not only to insulation performance but also to installation efficiency, space utilization, environmental resistance, and connection reliability.

4.1 Controlled Electric-Field Distribution

Composite shielding creates a more controlled electric field around the conductor and insulation. This is particularly important at voltage concentration points, including terminals, changes in geometry, and intermediate joints. By reducing localized electric stress, the design helps limit the conditions that may lead to corona discharge, partial discharge, or progressive insulation deterioration.

The terminals use prefabricated cold-shrink structures and stress cones. A stress cone changes the geometric distribution of the insulation and shielding at the end of the busbar. This redistributes the electric field over a larger area, reducing the intensity at the termination and creating a smoother transition to the connected equipment.

4.2 Reliable Current-Carrying Performance

The conductor is designed to carry the specified operating current with controlled temperature rise. At the terminal, an adapter connects the round tubular conductor to a flexible expansion joint or another connection interface. This adapter creates a smooth transition from the circular conductor to the required connection geometry and helps reduce excessive temperature rise at the end of the busbar.

The current-carrying capacity depends on conductor material, conductor cross-sectional area, installation arrangement, ambient temperature, ventilation, permissible temperature rise, voltage class, and applicable design standards. Standard product configurations may support currents up to approximately 3,000 A, while larger capacities can be engineered for specific projects.

4.3 Reduced Installation Space

The fully insulated structure allows the busbar to be installed with less dependence on large phase-to-phase and phase-to-ground air clearances. This can be beneficial in control rooms, switchgear areas, cable mezzanines, substations, and industrial facilities where available space is limited.

A compact routing arrangement may also reduce the length of supporting structures, simplify connection layouts, and improve the visual organization of the electrical installation. However, the required bending radius, support spacing, thermal expansion, shielding arrangement, and maintenance clearance must always be confirmed during engineering design.

4.4 Environmental Resistance

EPDM insulation offers strong resistance to ozone, ultraviolet radiation, moisture, and changing outdoor conditions. This makes the product appropriate for outdoor distribution systems and areas exposed to sunlight, rain, snow, condensation, or temperature variation.

The product can also be applied in industrial environments where resistance to selected chemical contaminants is required. A project-specific compatibility review remains necessary because chemical resistance depends on the compound formulation, concentration, temperature, exposure duration, and surrounding materials.

4.5 Mechanical Flexibility and Durability

Compared with brittle ceramic insulation, rubber-based insulation can better accommodate vibration, small movement, and installation stress. This is valuable in wind power systems, industrial facilities, and installations where equipment may experience thermal expansion or mechanical vibration.

The tubular conductor itself provides structural strength, while the flexible insulation and expansion connection help accommodate movement at equipment interfaces. Proper supports and connection arrangements remain essential because insulation flexibility does not eliminate the need to manage mechanical loads.

5. Terminals, Joints, and Connection Technology

The performance of a tubular busbar system depends heavily on its connection components. Terminals and intermediate joints must maintain electrical continuity, insulation integrity, shielding continuity, mechanical stability, and environmental protection.

5.1 Prefabricated Cold-Shrink Terminals

Prefabricated cold-shrink terminals are supplied in a controlled, pre-formed configuration. During installation, the terminal is positioned over the prepared busbar end and allowed to contract into close contact after the supporting core or installation element is removed.

This approach can reduce installation time compared with complex field-molded insulation procedures. It also supports consistent geometric control at the terminal, which is important for electric-field management. The stress cone inside the terminal helps redistribute the electrical stress at the end of the shielded insulation system.

Terminal adapters connect the round copper or aluminum tube to flexible expansion joints or equipment connection points. By providing a gradual transition from the circular conductor to the connection interface, the adapter helps prevent abrupt changes in current density and reduces the risk of excessive temperature rise at the terminal.

5.2 Intermediate Joints

Intermediate joints are used when the busbar route exceeds the length of a single manufactured section or when the installation layout requires a connection between separate sections. The joint must be compact, electrically reliable, mechanically secure, and appropriately sealed against moisture.

The described joint design uses a stainless steel inner sleeve to establish direct contact between the conductors. Two semicircular connecting busbars are installed externally, and four stainless steel C-clamps are tightened and welded using specialized tools or molds. This arrangement is intended to secure the conductor connection, maintain current-carrying capacity, and prevent deformation during assembly.

The joint insulation and shielding components are then installed around the connection. The final joint should restore the electrical geometry of the original busbar as closely as possible. In particular, the conductor shield, primary insulation, insulation shield, metal shield, and outer protection should form a continuous system across the joint area.

5.3 Waterproofing

After special waterproof treatment, the intermediate joint can support short-term operation while submerged in water, subject to the specified product design, installation quality, and test conditions. This feature can be useful in cable trenches, underground routes, low-lying areas, and facilities where temporary flooding or water accumulation may occur.

Waterproof performance should not be interpreted as permission for indefinite immersion under all conditions. The project engineer should confirm the allowable immersion duration, water pressure, water quality, operating voltage, joint installation procedure, and inspection requirements.

6. Comparison with Alternative Busbar Solutions

The EPDM silicone rubber tubular bus bar competes with several other power transmission solutions, including exposed rigid busbars, PVC-insulated busbars, ceramic-insulated busbars, conventional cable systems, epoxy resin cast busbars, and other busway products. Each technology has appropriate applications, but the fully insulated tubular structure offers a useful combination of performance characteristics.

Performance Factor	EPDM Silicone Rubber Tubular Bus Bar	PVC-Insulated Busbar	Ceramic-Insulated Busbar	Conventional Cable System
Insulation and Shielding	Composite insulation with conductor and insulation shielding	Basic polymer insulation depending on design	High dielectric strength but rigid insulation	Individual cable insulation and shielding
Weather Resistance	Strong resistance to UV, ozone, moisture, and temperature variation	More vulnerable to long-term UV and aging in some formulations	Good environmental resistance	Depends on cable sheath and installation environment
Mechanical Behavior	Flexible insulation with a strong tubular conductor	Generally flexible but application-dependent	Brittle and vulnerable to impact	Flexible, but requires cable supports and bending space
Space Efficiency	Compact route with reduced dependence on large clearances	Compact in suitable voltage ranges	May require rigid support arrangements	Multiple cables may require considerable space
Electric-Field Control	Conductor shield, insulation shield, stress cone, and shielded joints	Depends on product construction	Good insulation but connection geometry is critical	Generally established through cable shielding and terminations
Typical Maintenance Considerations	Inspect joints, terminals, supports, and shielding continuity	Inspect insulation and connections	Inspect for cracks and mechanical damage	Inspect cable terminations, supports, and sheath condition

Compared with PVC-based insulation, EPDM insulation can provide stronger resistance to outdoor aging, ozone, and ultraviolet exposure when the correct formulation is used. Compared with ceramic insulation, EPDM offers greater flexibility and improved tolerance of vibration and installation movement. Compared with a large group of parallel cables, a tubular busbar can provide a cleaner route and a more controlled connection arrangement for high-current applications.

Epoxy resin vacuum-cast tube busbars are another important alternative, particularly where rigid, highly compact, and mechanically robust systems are needed. EPDM rubber tubular busbars may be preferred where flexibility, outdoor resistance, and simplified field jointing are important. The final selection should be based on voltage, current, route length, environmental conditions, short-circuit forces, installation method, fire requirements, and project standards.

7. Typical Applications

7.1 Main Transformer to Switchgear

One of the most common applications is the connection between a main transformer and a low-voltage or medium-voltage switchgear assembly. The busbar can be routed directly from the transformer terminal to the switchgear terminal, creating a clear and organized high-current connection.

This arrangement is suitable for facilities requiring high current capacity, compact design, and full insulation. The connection layout can be engineered to support either a direct route or a route incorporating flexible expansion sections to accommodate transformer and switchgear movement.

7.2 Cable Trenches and Cable Mezzanines

The busbar may be installed through underground cable trenches or cable mezzanines. This is useful where the electrical route must pass below floor level, across a plant area, or through a restricted service space.

Because the busbar is fully insulated, it can be suitable for routes where exposed conductors would be difficult to protect. The compact structure can also help reduce congestion in cable areas. Waterproofed intermediate joints provide additional protection in locations where water accumulation may occur for short periods.

7.3 Switchgear-to-Switchgear Connections

Tubular busbars can connect adjacent or separated switchgear sections. The exact layout depends on the switchgear arrangement, required current capacity, maintenance access, and available installation space.

A shielded connection system can help maintain consistent insulation and electric-field performance between the switchgear terminals. The use of prefabricated components may also improve installation repeatability across multiple identical connection points.

7.4 Renewable Energy Facilities

Solar power stations, wind power facilities, and other renewable energy installations often require reliable connections between generation equipment, transformers, collection systems, and grid interface equipment. These installations may be exposed to strong sunlight, temperature cycling, vibration, dust, humidity, and difficult access conditions.

EPDM-based insulation and a fully shielded structure can be valuable in these environments. Wind power applications may also benefit from the product’s ability to accommodate mechanical movement when the system is correctly designed with flexible expansion connections and suitable supports.

7.5 Industrial Plants

Metallurgy, chemical processing, electronics manufacturing, transportation, and other industrial facilities often require high-current connections in compact spaces. Some areas may also have corrosive atmospheres, elevated temperatures, vibration, or frequent equipment changes.

The tubular busbar can be customized in conductor material, current rating, route geometry, terminal configuration, joint arrangement, and protective components. Engineering review is especially important in chemical environments to confirm material compatibility and the required external protection.

7.6 Outdoor Substations

Outdoor substations require equipment that can withstand weather exposure while maintaining electrical clearances and safe maintenance conditions. A fully insulated tubular busbar can simplify certain connections between transformers, switchgear, circuit breakers, and other high-voltage equipment.

Its shielding system reduces reliance on exposed air insulation, while the EPDM external insulation provides resistance to UV radiation, ozone, moisture, and temperature changes. The complete installation must still include appropriate grounding, support structures, lightning protection, and access controls.

8. Manufacturing and Quality Strengths

A reliable busbar manufacturer must provide more than an attractive product description. High-voltage equipment requires stable materials, controlled manufacturing, accurate assembly, documented inspection, and technical support throughout the project lifecycle.

8.1 Engineering and Customization

Jiangsu Wopeng Power Technology Co., Ltd. has engineering experience in high- and low-voltage busbar systems. Its product portfolio covers copper and aluminum tubular busbars, epoxy resin vacuum-cast tube busbars, low-voltage cast resin busways, wind power tube busbars, compact busbar systems, and sliding contact line systems.

This broad portfolio allows the manufacturer to compare different busbar technologies and recommend a suitable solution based on current, voltage, installation method, environmental conditions, and equipment interface requirements. Customization may include conductor size, material selection, insulation structure, route dimensions, terminal adapters, expansion joints, intermediate joints, support hardware, and monitoring functions.

8.2 Modern Production Equipment

Vacuum casting systems support the production of epoxy resin cast busbar products. CNC machining equipment enables accurate processing of conductors, connection components, adapters, and mechanical parts. Automated assembly technologies help improve repeatability and reduce variation in standardized production steps.

For EPDM tubular busbars, extrusion equipment and controlled polymer processing are particularly important. The manufacturer must control layer concentricity, material temperature, extrusion speed, interface quality, and final dimensions. These parameters influence dielectric performance, mechanical stability, terminal fit, and long-term service reliability.

8.3 Inspection and Testing

Typical inspection activities include conductor resistance measurement, insulation resistance testing, power-frequency withstand testing, partial discharge evaluation where specified, dimensional inspection, shielding continuity verification, mechanical checks, and routine visual examination.

Testing requirements vary according to voltage class, product type, customer specification, and applicable national or international standards. The supplier should provide appropriate test reports and technical documentation for the finished product. For major projects, cooperation with independent third-party testing institutions can provide additional validation.

8.4 Quality Management

A strict quality management system should control incoming materials, production processes, assembly operations, final inspection, packaging, and shipment. Traceability records allow the manufacturer to identify the materials and process conditions associated with each product section.

Quality control is particularly important for joints and terminals because field installation can influence the final electrical performance. Clear installation instructions, pre-installation inspections, trained technicians, and documented commissioning tests are essential parts of a complete supply program.

8.5 Project Experience

Wopeng products operate across more than 17 provinces and serve applications in power generation, substations, wind energy, industrial manufacturing, rail transit, and large commercial facilities. This type of application experience helps the manufacturer understand the practical requirements of different installation environments.

Founded in 2018, the company has developed a specialized focus on busbar systems and power transmission products. Its technical team includes engineers, technical specialists, and production professionals who support product development, manufacturing, project coordination, and after-sales service.

9. Design Considerations for System Selection

Selecting an EPDM silicone rubber tubular bus bar requires a coordinated electrical, mechanical, thermal, and environmental evaluation. The following factors should be confirmed before production.

9.1 Rated Voltage

The system voltage determines the insulation structure, shielding arrangement, terminal design, creepage requirements, and test program. The product is commonly positioned for medium- and high-voltage systems in the approximate range of 10 kV to 35 kV, while customized designs may be considered for other voltage levels.

The rated voltage should be reviewed together with maximum system voltage, power-frequency withstand voltage, lightning impulse withstand voltage, partial discharge requirements, and grounding arrangements.

9.2 Rated Current

Rated current affects the conductor material and dimensions, temperature-rise performance, terminal design, joint configuration, and support arrangement. Standard configurations may carry up to approximately 3,000 A, but the correct value must be calculated for the specific installation.

Ambient temperature, enclosure conditions, ventilation, installation orientation, parallel circuits, harmonic current, duty cycle, and allowable conductor temperature can all affect current-carrying capacity.

9.3 Short-Circuit Conditions

The busbar system must withstand the thermal and electrodynamic forces created by short-circuit current. This requires adequate conductor strength, joint security, support spacing, connection torque, and structural design.

Short-circuit calculations should consider the prospective fault current, fault duration, peak current, system grounding method, and equipment protection clearing time. The busbar manufacturer should receive this information during the engineering stage.

9.4 Route Geometry

The route drawing should show total length, elevation changes, bends, equipment interfaces, expansion points, support locations, joint positions, and access requirements. Tubular busbars are compact, but they still require correct bending and support arrangements.

Improper alignment may place excessive stress on terminals or joints. Flexible expansion sections should be used where necessary to accommodate thermal movement, transformer vibration, or equipment displacement.

9.5 Environmental Conditions

Environmental data should include indoor or outdoor installation, minimum and maximum temperature, humidity, altitude, UV exposure, pollution level, chemical contaminants, salt mist, dust, vibration, and potential water immersion.

The insulation and external sheath should be selected according to these conditions. In coastal environments, salt contamination and corrosion protection may require additional measures. In chemical plants, compatibility with vapors and liquids should be confirmed before final material selection.

10. Installation and Maintenance Recommendations

Installation should be carried out by trained personnel in accordance with the manufacturer’s instructions and the approved project drawings. The busbar should be protected from impact, contamination, moisture, and excessive bending during transportation and storage.

Before installation, each section should be inspected for surface damage, deformation, contamination, incorrect labeling, and missing components. Conductor ends, insulation surfaces, shields, terminal components, and joint kits should be checked before assembly.

Joint preparation must be performed carefully. The conductor should be cleaned and positioned correctly inside the stainless steel inner sleeve. Connecting busbars and C-clamps should be installed using the specified tools and tightening procedure. Any welding, shielding restoration, sealing, or insulation assembly must follow the approved process.

After installation, the system should be checked for correct phase identification, conductor continuity, shield continuity, grounding connection, mechanical support, terminal alignment, joint sealing, and clearance from nearby structures. Electrical tests should be completed before energization.

Routine maintenance should include visual inspection of terminals, joints, external sheath condition, support hardware, grounding connections, and signs of overheating or moisture ingress. Thermal imaging may be used to identify abnormal temperature at connections. The inspection interval should be determined by operating conditions, system criticality, environmental exposure, and applicable maintenance standards.

11. Intelligent Monitoring and Digital Service

Modern tubular busbar systems can be integrated with monitoring technologies. Wopeng has developed a CNC monitoring system intended to support unmanned monitoring of multiple technical parameters associated with tubular busbar operation.

Depending on the project design, monitoring may include temperature, load current, partial discharge indicators, environmental conditions, joint status, or other operational data. Continuous monitoring can help identify abnormal conditions before they develop into serious faults.

Digital monitoring is particularly useful in substations, renewable energy facilities, industrial plants, and other locations where access is difficult or where an unexpected shutdown would cause significant losses. Monitoring data should be integrated with the facility’s electrical management and maintenance procedures rather than treated as a replacement for proper inspection and testing.

12. Frequently Asked Questions

Q1: What is an EPDM silicone rubber tubular bus bar?

An EPDM silicone rubber tubular bus bar is a fully insulated tubular conductor system consisting of a copper or aluminum tube, conductor shielding, EPDM-based primary insulation, insulation shielding, metal shielding, and an external protective sheath. It is designed for safe and compact power transmission in medium- and high-voltage applications.

Q2: What voltage range is suitable for this busbar?

The product is commonly used in 10 kV to 35 kV medium- and high-voltage systems. Higher or lower voltage applications may be possible through customized engineering. The final voltage rating must be confirmed through the product design, insulation system, terminal configuration, and test reports.

Q3: Is the busbar suitable for outdoor installation?

Yes. EPDM-based insulation provides strong resistance to ultraviolet radiation, ozone, moisture, and weather changes. The product can be used in outdoor substations, renewable energy facilities, and external power distribution systems when the complete system is designed for the site conditions.

Q4: Can the busbar be used in coastal areas?

It can be considered for coastal applications because the insulation has good environmental resistance. However, salt mist, corrosion, pollution level, metal protection, grounding, and joint sealing must be evaluated. The manufacturer should confirm the appropriate material and protection configuration.

Q5: What is the maximum current-carrying capacity?

Some standard models can carry up to approximately 3,000 A, while larger-capacity solutions may be customized. Actual capacity depends on conductor material, conductor size, ambient temperature, installation arrangement, permissible temperature rise, and system requirements.

Q6: Why is triple-layer co-extrusion important?

Triple-layer co-extrusion forms the conductor shield, insulation, and insulation shield in a coordinated process. This helps create tight interfaces with fewer gaps and improves consistency in layer thickness, electric-field control, and insulation performance.

Q7: How are intermediate joints connected?

The described joint design uses stainless steel inner sleeves for direct conductor contact. Two semicircular connecting busbars are installed externally, and four stainless steel C-clamps are tightened and welded with specialized tools or molds. The insulation, shielding, and waterproofing components are then restored around the joint.

Q8: Can the joints operate under water?

After special waterproof treatment, intermediate joints can support short-term submerged operation under specified conditions. This does not mean that every installation is suitable for permanent immersion. The allowable duration, water conditions, pressure, voltage, and installation quality must be confirmed for each project.

Q9: How does this product compare with ceramic-insulated busbars?

Ceramic insulation can provide high dielectric strength and strong environmental resistance, but it is rigid and may be vulnerable to impact or mechanical stress. EPDM rubber insulation generally provides greater flexibility and better tolerance of vibration and movement while maintaining strong insulation and weather-resistance characteristics.

Q10: How does it compare with conventional cables?

The tubular busbar provides a rigid, compact, and engineered route for high-current transmission. It can simplify certain transformer-to-switchgear connections and reduce cable congestion. Conventional cables may remain preferable where routing flexibility, long-distance installation, or standardized cable accessories are the primary requirements.

Q11: Can copper and aluminum conductors both be supplied?

Yes. Copper and aluminum tubular conductors can be selected according to conductivity, current rating, weight, mechanical requirements, cost, and connection design. The terminal adapters and joint components must be matched to the selected conductor material.

Q12: What documentation should a buyer request?

A buyer should request product drawings, electrical ratings, material information, installation instructions, routine test reports, type-test information where applicable, joint and terminal specifications, quality records, and environmental limitations. For critical projects, independent test validation may also be requested.

13. Why Choose a Specialized Manufacturer

A specialized busbar manufacturer can coordinate the electrical conductor, insulation system, shielding structure, terminals, joints, mechanical supports, testing, and installation requirements as one integrated project. This is more effective than sourcing each component independently and attempting to resolve compatibility issues during installation.

Jiangsu Wopeng Power Technology Co., Ltd. provides customized OEM solutions for insulated busbars and tubular busbar systems. Its technical scope extends from low-voltage busways to 35 kV tubular busbar products. The company’s manufacturing resources include extrusion-related processes, vacuum casting, CNC machining, automated assembly, and standardized testing.

Its experience across power generation, substations, wind energy, industrial production, rail transit, and commercial facilities supports the development of solutions for different installation conditions. The company can provide engineering coordination for conductor selection, route design, terminals, joints, expansion connections, monitoring systems, and project documentation.

For customers purchasing a high-voltage EPDM silicone rubber tubular bus bar, the most important evaluation criteria are not limited to price. Material quality, process consistency, electrical testing, joint reliability, customization capability, delivery control, installation support, and after-sales service all influence the long-term value of the system.

14. Conclusion

The EPDM silicone rubber tubular bus bar is a fully insulated, shielded, and compact solution for medium- and high-voltage power transmission. Its tubular copper or aluminum conductor provides the current path, while the composite insulation and shielding system supports electrical safety and controlled electric-field distribution.

The triple-layer co-extrusion process helps create tight interfaces between the conductor shield, EPDM insulation, and insulation shield. Prefabricated cold-shrink terminals, stress cones, terminal adapters, stainless steel inner sleeves, semicircular connecting busbars, C-clamps, and waterproofed intermediate joints form a complete connection system designed for dependable operation.

Compared with conventional PVC insulation, ceramic insulation, exposed busbars, and groups of parallel cables, the product offers a balanced combination of weather resistance, mechanical flexibility, compact routing, high-current capability, and electric-field control. It is suitable for transformer connections, switchgear systems, substations, cable trenches, industrial plants, wind power facilities, solar power stations, and other critical electrical installations.

With engineering capabilities, modern production equipment, CNC machining, vacuum casting, automated assembly, co-extrusion technology, standardized quality inspection, and project experience across multiple industries, Jiangsu Wopeng Power Technology Co., Ltd. is positioned to provide customized insulated busbar and tubular busbar system solutions.

For technical consultation, customers can contact Jiangsu Wopeng Power Technology Co., Ltd. at +86-180 3625 3000 or admin@wpbusbar.com. The company is located at No. 8, Yanjin Road, Chengxi Industrial Park, Shanyang Town, Baoying County, Yangzhou City, Jiangsu Province, China.

References

1. IEC 62271 series, High-Voltage Switchgear and Controlgear.

2. IEC 60502 series, Power Cables with Extruded Insulation and Their Accessories.

3. IEC 60840, Power Cables with Extruded Insulation and Their Accessories for Rated Voltages Above 30 kV up to 150 kV.

4. IEC 60270, High-Voltage Test Techniques: Partial Discharge Measurements.

5. IEC 60071 series, Insulation Coordination.

6. IEEE standards and recommended practices for busbar systems, insulation coordination, power equipment testing, and high-voltage electrical installations.

7. Manufacturer technical specifications for composite shielded insulated tubular busbars, terminals, intermediate joints, and expansion connections.

8. Manufacturer quality-control procedures for conductor preparation, polymer extrusion, CNC machining, automated assembly, electrical testing, and final inspection.

Product: EPDM Silicone Rubber Tubular Bus Bar