Epoxy Resin Casting Tubular Bus Bar: Advanced Insulated Power Transmission for Medium- and High-Voltage Systems

Epoxy Resin Casting Tubular Bus Bar is a high-performance power transmission product developed for installations that demand electrical safety, mechanical strength, environmental resistance, and long-term operating stability. By combining a tubular copper conductor with a fully cast insulation system, this type of bus bar provides a compact and reliable alternative to conventional open busbars, cable connections, and separately assembled insulated conductors.

The product is manufactured through an integrated vacuum casting process. A fully automated two-component mixing and injection system introduces epoxy resin under controlled pressure and vacuum conditions, after which the assembly is cured at high temperature. This process unifies the conductor, insulation system, semiconductive layers, shielding components, and protective exterior into a single inseparable structure.

For medium- and high-voltage applications, the quality of insulation, the reliability of joints, the grounding arrangement, and the stability of the manufacturing process are equally important. A weakness in any of these areas can lead to partial discharge, overheating, moisture penetration, insulation failure, or premature maintenance requirements. Epoxy Resin Casting Tubular Bus Bar is designed to address these risks through integrated molding, high-quality conductive materials, shielded construction, and carefully controlled connection technology.

Jiangsu Wopeng Power Technology Co., Ltd. specializes in high- and low-voltage busbar systems and develops products for power generation, substations, industrial facilities, renewable energy projects, rail transit, and large commercial buildings. Its product portfolio includes epoxy resin vacuum-cast tubular busbars, low-voltage cast resin busways, copper and aluminum tubular busbars, wind power tubular busbars, compact busbar systems, and sliding contact line systems.

1. Overview of Epoxy Resin Casting Tubular Bus Bar

An Epoxy Resin Casting Tubular Bus Bar is an insulated electrical conductor in which a metal tube or tubular conductor is surrounded by a molded epoxy resin insulation system. The conductor is normally made from high-purity copper, although aluminum conductor configurations can be developed for specific applications. The tubular form provides good mechanical rigidity, efficient heat dissipation, and a practical geometry for routing power through substations, switch rooms, transformer connections, and industrial distribution systems.

Unlike a conventional bare busbar, the cast tubular bus bar does not rely on large air clearances as its primary insulation method. Instead, the conductor is enclosed within a solid insulation structure. This arrangement improves protection against accidental contact, dust accumulation, condensation, salt deposits, and other environmental influences that can reduce the reliability of exposed conductors.

The insulation body is formed around the conductor through a controlled casting cycle. The process can integrate the conductor, inner shielding layer, semiconductive crepe paper, outer shielding layer, metal shielding layer, and outer protective layer. Since these components are molded together, the finished assembly is nonseparable and has fewer interfaces than a product assembled from multiple independent insulation components.

The design is suitable for medium-voltage and higher-voltage systems, with insulation thickness selected according to the rated voltage and project requirements. Typical reference insulation thicknesses include approximately 10 millimeters for 10 kV systems, 15 millimeters for 35 kV systems, 20 millimeters for 66 kV systems, 30 millimeters for 110 kV systems, and 45 millimeters for 220 kV systems. Final dimensions and dielectric requirements should always be confirmed through the project specification, applicable standards, and type-test documentation.

Core Product Characteristics

The principal characteristics of the product include fully insulated construction, integrated epoxy resin molding, flame-retardant performance, resistance to aging, reliable metal shielding, grounded shielding layers, high-purity copper conductors, and flexible connection arrangements at equipment terminals.

The product is designed with a service life of more than 30 years under appropriate operating conditions. Long service life depends on correct design, suitable installation, proper support spacing, correct joint assembly, environmental compatibility, and periodic inspection of the complete power system.

The maximum suspension span is specified as no more than 5 meters. This limitation helps control mechanical stress, vibration, deflection, and the forces applied to terminal and intermediate connections. Actual support spacing should be determined according to conductor size, installation direction, short-circuit forces, seismic requirements, and the project’s mechanical calculations.

Epoxy Resin Casting Tubular Bus Bar

2. Integrated Vacuum Casting Manufacturing Process

The main technical advantage of the product is its integrated molding process. The bus bar is produced using a fully automatic two-component vacuum injection molding machine. The two resin components are accurately metered, mixed, degassed, and injected into a prepared mold containing the conductor and associated insulation and shielding components.

Vacuum processing is important because air voids and gas inclusions can become electrical weak points inside solid insulation. Under medium- and high-voltage stress, voids may produce partial discharge and accelerate deterioration. By removing air and controlling the resin flow, the manufacturing process helps create a more uniform insulation body with reduced internal defects.

After injection, the product undergoes high-temperature curing. The curing cycle is controlled according to resin formulation, mold temperature, conductor configuration, insulation thickness, and production requirements. Correct curing allows the epoxy resin to achieve the required mechanical strength, thermal stability, dielectric performance, and resistance to environmental influences.

Advantages of Two-Component Resin Processing

Two-component epoxy systems generally consist of a resin component and a hardener component. The mixing ratio must remain within a carefully controlled range. An automated system improves consistency compared with manual preparation because it can monitor the quantity, mixing condition, vacuum level, injection pressure, and process timing.

Accurate mixing helps reduce variation between production batches. It also supports stable curing characteristics and consistent insulation performance across the length of the tubular bus bar. For long products and complex terminal structures, repeatability is especially important because uneven curing or inconsistent resin distribution could affect both electrical and mechanical properties.

The automated process also reduces the number of manual operations. Fewer manual interventions can lower the risk of contamination, incorrect component placement, and assembly errors. At the same time, production records can be associated with each batch or product, supporting traceability and quality management.

One-Shot Formation of Joints and Conductors

The insulation joints and copper conductors are manufactured through a one-shot molding process. This means that the insulation joint is formed as part of the same controlled casting operation rather than being assembled from several independent pieces. The result is a continuous interface-free fusion between the insulation structure and the conductor assembly.

Integrated joint molding can reduce the number of potential leakage paths and mechanical discontinuities. It also helps produce a more uniform electric field around the conductor. In contrast, separately assembled insulation components may require additional interfaces, seals, fastening parts, or field-applied materials. Every additional interface increases the importance of installation accuracy and environmental protection.

One-shot molding does not eliminate the need for careful field installation. Terminal interfaces, equipment connections, grounding points, and support structures still require correct assembly. However, it reduces the amount of insulation work that must be performed at the installation site and moves critical insulation production into a controlled factory environment.

3. Product Structure and Electrical Design

The tubular bus bar uses a multilayer structure designed to control electric field distribution, provide insulation, protect the conductor, and establish a reliable grounding path. The exact layer arrangement can vary according to voltage level and project design, but the principal components include the conductor, inner shielding layer, semiconductive layer, outer shielding layer, metal shielding layer, and outer protective layer.

High-Purity Copper Conductor

The conductor is manufactured from TZ7 or higher-grade oxygen-free copper, with a stated copper content of at least 99.90 percent for the pure copper tube. High-purity copper offers low electrical resistivity and supports efficient current transmission. It also provides good thermal conductivity, which helps transfer heat from the conductor toward the surrounding insulation and external surface.

The conductor end is prepared for low-resistance connection. The end of the copper tube should be rounded, and the connection surface may be silver-plated or tin-plated. Surface treatment helps improve corrosion resistance and supports stable contact resistance at bolted or clamped interfaces.

For high-current systems, conductor dimensions are selected according to rated current, short-circuit withstand requirements, allowable temperature rise, installation method, ambient conditions, and voltage level. Standard configurations may support currents up to approximately 3,500 A, while customized designs may be developed for higher current requirements after thermal and mechanical verification.

Semiconductive and Shielding Layers

Semiconductive layers help control the electric field at the boundaries between the conductor, insulation, and outer shielding system. A controlled field distribution is essential for reducing local electrical stress and improving the long-term reliability of the insulation.

The metal shielding layer is fabricated from a composite arrangement of tinned steel strip and copper strip according to the supplied product structure. The shield provides an equipotential external surface and helps contain electric fields within the insulation system. It also provides a conductive route for fault current and induced current when properly connected to the grounding system.

A fully shielded structure is particularly valuable in areas where personnel safety, compact installation, and predictable electromagnetic behavior are important. It reduces the exposure of energized components and supports a more controlled installation than open conductors.

Grounding System

The grounding lead is reliably welded to the copper braided wire and the metal shielding layer. Grounding points must be connected securely to the site grounding system. They must also be marked and numbered so that installation personnel can identify each point during assembly, testing, and maintenance.

Grounding points require waterproof and moistureproof protection. The insulating outer cover of the grounding screen should prevent the intrusion of moisture into the grounding and shielding interface. Heat-shrink insulation bushings can be used where appropriate, and phase colors such as yellow, green, and red may be applied in visible locations for identification.

A correctly designed grounding system is essential for fault protection and touch-voltage control. It also supports the function of the metal shield during abnormal operating conditions. Grounding continuity should be verified during commissioning and included in routine inspection programs.

4. Electrical and Mechanical Performance

Epoxy resin provides a combination of dielectric strength, mechanical rigidity, dimensional stability, and environmental resistance. The supplied technical information identifies a dielectric breakdown strength of at least 30 kV/mm for the epoxy insulation system and insulation resistance above 1.0 × 10¹³ ohms for the referenced product configuration. These values should be confirmed through project-specific test reports and applicable standards.

The insulation system is designed for working temperatures from approximately -30°C to 130°C in the general product description. The stated operating environment also includes a minimum ambient air temperature of -45°C and a maximum ambient temperature of +60°C. Since these figures relate to different design references, the final allowable conductor temperature, resin temperature class, and site ambient range must be confirmed for each project.

The epoxy resin insulation is described as flame retardant and resistant to aging. The supplementary product information refers to UL94 V-0 performance for the insulation material. Fire performance classifications must be verified for the complete finished product rather than assumed solely from the raw resin classification.

Temperature Rise and Heat Dissipation

Temperature rise is a major consideration in high-current busbar design. Excessive temperature can accelerate insulation aging, increase contact resistance, reduce mechanical strength, and shorten service life. The tubular geometry, high-conductivity copper conductor, and stable insulation structure support efficient thermal management.

The intermediate connection uses an embedded stainless steel clamp welding technique. The terminal joint is formed together with the conductor, and the design requirement states that the temperature rise at the terminal joint should remain lower than the temperature rise of the conductor body. This is an important advantage because poorly designed joints are common sources of localized heating in power transmission systems.

Connections between the busbar terminal joint and equipment are made through flexible links secured with bolts. The flexible link accommodates installation tolerances, thermal movement, vibration, and minor relative displacement between the busbar and connected equipment. Bolted fastening permits controlled installation and future inspection while maintaining a robust electrical path.

Mechanical Strength and Support

The cast insulation body provides mechanical protection around the conductor and contributes to the rigidity of the complete assembly. The maximum suspension span of 5 meters helps control deflection and mechanical loading. Supports must be designed for the product weight, wind loads, seismic loads, short-circuit forces, transportation conditions, and installation orientation.

The referenced environmental design includes seismic intensity of 8 degrees, horizontal ground acceleration of 0.20 g, vertical ground acceleration of 0.15 g, a frequency of 20 Hz, and a sine-wave endurance period of three cycles. These conditions provide a design basis for projects in demanding regions, but project-specific seismic calculations and qualification documents remain necessary.

5. Protection Against Moisture, Pollution, and Corrosion

Moisture is one of the most serious threats to insulation reliability. Water can enter poorly protected joints, grounding points, surface defects, or unsealed interfaces. Moisture contamination can lower surface resistance, increase leakage current, promote tracking, and accelerate partial discharge or insulation breakdown.

The cast epoxy structure provides a solid barrier against moisture penetration through the main insulation body. Waterproof and moistureproof measures are also applied to grounding points, terminal areas, and external interfaces. These measures should be maintained during transportation, storage, installation, and commissioning.

The product is designed for demanding environmental conditions, including daily average relative humidity of up to 95 percent and monthly average relative humidity of up to 90 percent. The environmental reference also includes ice thickness of up to 20 millimeters and solar radiation intensity of approximately 1,000 W/m².

For heavily polluted outdoor locations, creepage distance and terminal design are particularly important. The supplied information refers to pollution level V under GB/T 5582 and a design creepage distance of 31 millimeters per kilovolt, with additional climbing arrangements at outdoor terminals. These values must be checked against the actual system voltage, installation altitude, pollution level, and relevant standard requirements.

Corrosion Protection

Metal components exposed during site construction should receive appropriate anti-rust treatment. Bolts and screws are specified as hot-dip galvanized materials. This is particularly useful in humid, coastal, industrial, or chemically active environments where untreated steel can corrode rapidly.

The use of tinned or plated conductor connection surfaces also helps preserve low contact resistance. However, surface preparation, tightening torque, contact pressure, and protection against galvanic corrosion remain important during installation. All contact surfaces should be clean and free of contamination before assembly.

6. Advantages Over Conventional Busbar and Cable Solutions

Epoxy Resin Casting Tubular Bus Bar offers several advantages compared with bare busbars, conventional cable connections, and some separately insulated busbar arrangements. The most important benefit is the combination of compact insulation, mechanical strength, controlled electric field distribution, and factory-made joints.

Compared with Bare Busbars

Bare busbars require large air clearances and additional barriers to prevent accidental contact and phase-to-phase faults. Their surfaces can accumulate dust, salt, moisture, and industrial contaminants. In outdoor or polluted environments, this can increase the risk of flashover and insulation failure.

A fully insulated cast tubular bus bar substantially reduces reliance on air clearance. It provides a physical insulation barrier around the energized conductor and is less exposed to surface contamination. This can make routing more compact and simplify installation in locations where space is limited.

The insulated structure also improves personnel safety during normal operation and maintenance. Although the busbar must still be treated as a high-voltage component and properly grounded, its construction provides a stronger protective barrier than an exposed conductor.

Compared with Conventional Power Cables

Power cables are flexible and widely used, but high-current cable systems may require multiple parallel cables, complex cleating, large cable trenches, and careful phase arrangement. Parallel cables can also create installation challenges related to heat dissipation, electromagnetic forces, bending radius, and termination space.

A tubular busbar provides a more rigid and organized route. The conductor is positioned accurately inside a controlled insulation structure, and the system can be designed as a direct connection between transformers, switchgear, and other major equipment. This may reduce routing complexity and create a cleaner installation.

For high-current links, the tubular arrangement can also reduce the number of individual conductors and terminations. Fewer parallel cable connections can mean fewer termination points requiring inspection and maintenance. The most suitable solution depends on current rating, route length, flexibility requirements, installation environment, and total project cost.

Compared with Separately Assembled Insulation Systems

Products assembled from separate insulation tubes, shields, wraps, and protective components may contain more interfaces. Each interface requires dimensional control, sealing, alignment, and field inspection. Inadequate installation can create air gaps or moisture paths.

The integrated casting process produces a monolithic structure in which the principal layers are formed together. This reduces the number of separable components and improves consistency between products. Factory-controlled production also reduces the amount of critical insulation work carried out at the construction site.

Compared with Silicone Rubber and PVC Insulation

Silicone rubber insulated busbars offer flexibility and good environmental performance in some applications. However, epoxy resin casting generally provides greater structural rigidity and higher resistance to deformation. The supplied comparison identifies a breakdown voltage of at least 30 kV/mm for the epoxy resin casting design, compared with approximately 25 kV/mm for a silicone rubber insulated busbar and up to 15 kV/mm for a PVC insulated busbar.

The same comparison identifies UL94 V-0 non-flammable performance for the epoxy resin casting product, UL94 V-1 for silicone rubber insulation, and UL94 V-2 for PVC insulation. These reference classifications indicate why cast epoxy systems are attractive for installations where fire performance and insulation stability are key considerations. Final fire and dielectric ratings must be confirmed for the complete product through recognized test documentation.

Characteristic	Epoxy Resin Casting Tubular Bus Bar	Silicone Rubber Insulated Bus Bar	PVC Insulated Bus Bar
Reference breakdown strength	At least 30 kV/mm	Approximately 25 kV/mm	Up to approximately 15 kV/mm
Reference fire classification	UL94 V-0	UL94 V-1	UL94 V-2
Mechanical rigidity	High	Flexible	Moderate
Moisture resistance	Excellent when properly sealed	Good	Limited in demanding conditions
Joint production	Integrated factory molding	Usually assembled or molded according to design	Generally separately insulated
Typical application advantage	High-voltage, high-safety, compact power transmission	Flexible routing and vibration accommodation	Lower-voltage general insulation applications

7. Applications in Power and Industrial Infrastructure

The product is suitable for connection systems where large amounts of electrical power must be transmitted safely through a controlled route. Common applications include transformer-to-switchgear connections, substation busbar links, generator connections, industrial distribution systems, and connections between switch cabinets.

Transformer to Control Room Connection

One common application is the direct connection from the low-voltage terminals of a main transformer to the switchgear or control room. This arrangement is suitable for high-current transmission and creates a clear, orderly route. Depending on the project design, the system may be fully insulated or use another approved insulation configuration.

The tubular busbar can be designed to connect directly to transformer terminals and switchgear terminals through flexible links and bolted interfaces. The result is a compact power path with fewer exposed parts than a bare conductor arrangement.

Cable Trenches and Cable Mezzanines

The busbar can be routed through underground cable trenches or cable mezzanines. This is useful when direct overhead routing is impractical or when the project requires an organized underground connection between transformers and switch cabinets.

A fully insulated tubular busbar is especially useful where the routing space is narrow, dusty, humid, or difficult to access. Its rigid structure can be supported at calculated intervals while maintaining a defined phase arrangement and controlled clearance from surrounding structures.

Industrial Facilities

Industrial plants often contain high-current equipment, mechanical vibration, dust, chemical pollutants, and complex distribution routes. The cast epoxy structure can provide a protective solution for petrochemical plants, metallurgy facilities, manufacturing plants, and other critical industrial installations.

In these environments, the product specification should consider chemical compatibility, ambient temperature, vibration, short-circuit current, maintenance access, and the possibility of explosive or classified areas. Additional project-specific certification may be required for hazardous locations.

Renewable Energy and Wind Power Systems

Wind power stations and renewable energy facilities frequently require compact, reliable power transmission between generators, transformers, converters, and collection systems. Tubular busbars can be adapted to vertical or constrained routes and can provide a robust alternative to multiple parallel cables in certain sections.

Wind turbine applications require careful consideration of vibration, cyclic loading, temperature changes, transportation limitations, and installation access. The support system, flexible connections, grounding arrangement, and mechanical qualification must be designed specifically for the turbine or renewable energy project.

Buildings, Hospitals, and Data Centers

Large buildings, hospitals, and data centers require reliable electrical distribution and strong fire-safety performance. Compact insulated busbar systems can help reduce the space required for power connections while maintaining separation between energized conductors and surrounding building structures.

Data centers and hospitals also place high value on continuity of supply and maintainability. Factory-produced joints, clear phase identification, grounding continuity, and standardized testing can support commissioning and long-term maintenance programs.

8. Manufacturing and Quality Strengths

Jiangsu Wopeng Power Technology Co., Ltd. was founded in 2018 as a specialized high-tech enterprise focused on high- and low-voltage busbar systems. Its engineering and production capabilities cover product development, vacuum casting, CNC machining, automated assembly, testing, and project-specific customization.

The company operates production lines equipped with vacuum casting systems, CNC machining equipment, and automated assembly technologies. These facilities support the dimensional accuracy, process repeatability, and structural consistency required for insulated tubular busbars.

Engineering and Customization

Busbar systems must be adapted to project-specific voltage, current, route geometry, support arrangement, connection dimensions, environmental conditions, and installation limitations. A standard product alone is not sufficient for every application. Engineering support is therefore an important part of product value.

Wopeng provides customized solutions for low-voltage through 35 kV systems and maintains a broader portfolio for different voltage and application requirements. Product customization can include conductor dimensions, insulation thickness, terminal configuration, flexible connection length, support arrangement, shielding design, and installation accessories.

Engineering teams can evaluate the relationship between current capacity, conductor temperature, insulation thickness, short-circuit forces, suspension span, and environmental conditions. This helps ensure that the final product is selected according to the complete system rather than a single electrical parameter.

Testing and Inspection

Each product undergoes standardized inspection processes, including high-voltage testing, insulation testing, mechanical verification, and routine quality checks. Testing collaboration with third-party institutions provides independent validation for safety and performance where required by the project.

Typical quality documentation may include material certificates, dimensional inspection records, insulation resistance results, withstand-voltage results, conductor resistance data, grounding continuity results, curing records, and final inspection reports. Type tests and routine tests should be selected according to the rated voltage, product design, customer specification, and applicable standards.

Quality control begins with raw materials and continues through conductor preparation, shielding assembly, mold preparation, resin mixing, vacuum injection, curing, machining, terminal finishing, and final inspection. This process-based approach is important because the quality of an integrated cast product depends on the interaction of all production stages.

Application Experience

Wopeng products operate across more than 17 provinces and serve multiple industrial sectors. This application experience helps the company understand the practical requirements of transportation, site installation, climate variation, high-current operation, and maintenance access.

Experience in different environments also supports continuous improvement. Feedback from substations, wind power projects, industrial plants, rail transit facilities, and commercial buildings can be used to refine connection design, waterproofing methods, support structures, identification systems, and installation instructions.

9. Installation and Commissioning Considerations

Correct installation is essential to achieve the designed performance of Epoxy Resin Casting Tubular Bus Bar. The product should be transported and stored in a way that prevents impact, contamination, water ingress, excessive bending, and damage to terminal surfaces or protective layers.

Before installation, the product should be inspected for cracks, dents, contamination, missing accessories, damaged labels, and deformation. The conductor ends and flexible connection surfaces should be checked carefully. Any protective packaging should be removed only when the product is ready for installation.

Support and Alignment

Supports must be positioned according to the approved installation drawing. The maximum suspension span should not exceed the specified 5-meter limit unless a different arrangement has been verified through mechanical calculation and approved by the responsible design authority.

The busbar should be aligned without forcing it into position. Excessive external force can damage the insulation structure, create stress at terminal joints, or introduce unwanted load into connected equipment. Flexible links should be used as designed to accommodate small alignment differences.

Terminal Connection

Terminal connections should be clean, correctly aligned, and tightened according to the specified torque. The connection surface of the copper tube should be properly plated or treated. Bolts, washers, and other fastening components should match the specified materials and corrosion-protection requirements.

The connection between the terminal joint and equipment should use the specified flexible link and bolted fastening arrangement. Directly forcing a rigid busbar into an equipment terminal can transfer mechanical stress to transformer bushings, switchgear terminals, or other sensitive components.

Grounding and Identification

Every grounding point should be connected to the site grounding system and checked for electrical continuity. Grounding points must be marked and numbered in accordance with the installation drawings. Phase identification should remain visible after installation, using the approved yellow, green, and red phase markings where applicable.

Waterproof and moistureproof covers should be installed correctly around grounding points and exposed interfaces. Heat-shrink insulation bushings or other approved protective systems should be inspected for full coverage and correct sealing.

Commissioning Tests

Commissioning may include visual inspection, dimensional verification, insulation resistance measurement, power-frequency withstand testing, grounding continuity testing, conductor resistance testing, phase identification, and functional verification of connected equipment.

Test voltages and acceptance criteria must be determined from the rated voltage, applicable standards, customer requirements, and approved commissioning procedure. High-voltage testing should be performed only by qualified personnel using calibrated equipment and appropriate safety controls.

10. Operating Environment and Design Conditions

The product can be designed for demanding environmental conditions. The supplied reference conditions include an altitude of up to 4,000 meters, ambient temperatures from approximately -45°C to +60°C, a maximum daily temperature variation of 35 K, solar radiation of 1,000 W/m², and maximum wind speed of 40 m/s.

Relative humidity conditions are referenced at a daily average of no more than 95 percent and a monthly average of no more than 90 percent. Ice thickness is identified as no more than 20 millimeters. These conditions provide useful design inputs, but the product selection should always account for the actual site climate and enclosure arrangement.

At high altitude, air density decreases and external insulation performance can be affected. Although the internal solid insulation of the cast busbar is less dependent on air clearance, terminal arrangements, outdoor interfaces, and external creepage distances may require correction. Altitude-specific design verification should be completed for installations above standard reference elevations.

For locations with high solar radiation, external surface temperature and thermal expansion should be evaluated. In coastal or polluted areas, terminal creepage distance, surface protection, sealing, and inspection frequency become more important. In regions with strong wind or ice, mechanical supports and connection forces require additional evaluation.

11. Technical Selection Guide

Selecting an Epoxy Resin Casting Tubular Bus Bar requires more than identifying a voltage rating. Engineers should review the complete electrical, mechanical, environmental, installation, and maintenance requirements of the project.

Voltage and Insulation Thickness

The rated system voltage determines the insulation system, shielding arrangement, creepage requirements, withstand voltage, and overall dimensions. Typical reference insulation thicknesses range from 10 millimeters at 10 kV to 45 millimeters at 220 kV. These figures are not universal design rules and must be confirmed for the specific product and standard.

Current Rating

Current rating depends on conductor dimensions, conductor material, allowable temperature rise, ambient temperature, installation orientation, support spacing, and heat dissipation. Parallel operation, emergency loading, and short-time current requirements should also be evaluated.

Short-Circuit Withstand

Short-circuit current produces both thermal and electrodynamic forces. The conductor, joints, supports, flexible links, and terminal equipment must withstand the specified short-circuit duration and peak current. A mechanical verification should be completed for every critical high-current connection.

Route and Connection Geometry

The route should be reviewed in three dimensions. Important parameters include straight sections, bends, elevation changes, support locations, transformer terminal positions, switchgear arrangements, access space, and transportation limitations. Factory drawings should be approved before production to minimize field modification.

Environmental Conditions

Altitude, temperature, humidity, pollution, solar radiation, wind, ice, seismic activity, chemical exposure, and indoor or outdoor installation all influence product selection. Additional protective measures may be needed for severe environments.

12. Frequently Asked Questions

What is an Epoxy Resin Casting Tubular Bus Bar?

It is a tubular conductor surrounded by a solid epoxy resin insulation and shielding system. The product is manufactured through a controlled casting process that integrates the conductor, insulation, shielding, and protective layers into a compact, nonseparable structure.

What are the main advantages of the product?

The main advantages are fully insulated construction, high mechanical strength, good moisture resistance, flame-retardant performance, controlled electric field distribution, reliable grounding, reduced exposure to pollution, and factory-produced integrated joints.

What conductor material is used?

The specified conductor is TZ7 or higher-grade oxygen-free copper, with copper content of at least 99.90 percent for the pure copper tube. Other conductor arrangements may be developed for specific projects, but material and performance must be confirmed through the approved technical specification.

What voltage levels are available?

The reference insulation table includes 10 kV, 35 kV, 66 kV, 110 kV, and 220 kV configurations. Wopeng’s company information emphasizes products covering low voltage through 35 kV, while higher-voltage designs may depend on project-specific engineering, qualification, and certification requirements.

What is the expected service life?

The product has a designed service life of more than 30 years under suitable operating conditions. Actual service life depends on temperature, electrical loading, environmental exposure, installation quality, joint condition, maintenance, and compliance with the approved operating limits.

Can the product be used outdoors?

Yes, outdoor applications can be considered when the product configuration includes appropriate weather protection, sealing, creepage distance, shielding, terminal design, and corrosion protection. Outdoor use should be confirmed through the project specification and environmental qualification documents.

What is the maximum suspension span?

The stated maximum suspension span is no more than 5 meters. Support spacing should also be checked against conductor weight, short-circuit forces, seismic conditions, wind, ice, vibration, and the mechanical requirements of the complete installation.

How are the busbar and equipment connected?

Connections between the busbar terminal joint and equipment are made through flexible links secured with bolts. The flexible link helps accommodate alignment tolerances and mechanical movement while maintaining a reliable electrical connection.

How is the metal shield grounded?

The grounding lead is reliably welded to the copper braided wire and the metal shielding layer. Grounding points are connected to the site grounding system, waterproofed, identified, and tested for continuity during commissioning.

How does the product compare with cable systems?

The tubular busbar provides a rigid, organized, and compact power path. It can reduce the number of parallel high-current cables and terminations in suitable applications. Cables may remain preferable where extensive flexibility, long routes, or frequent changes in direction are required.

What tests should be requested before shipment?

Customers may request routine test records, insulation resistance results, withstand-voltage results, conductor resistance data, grounding continuity results, dimensional records, material certificates, and type-test documentation where applicable. The exact test package should be agreed before production.

Can the product be customized?

Yes. Customization may include voltage level, conductor size, current rating, insulation thickness, terminal dimensions, flexible links, support arrangement, route geometry, grounding points, phase identification, and environmental protection. A complete technical drawing and project data are needed for accurate design.

13. Why Choose an Experienced Manufacturer

The reliability of a cast tubular busbar depends not only on the resin formulation but also on conductor preparation, mold accuracy, vacuum control, mixing precision, curing conditions, shielding assembly, joint design, machining, and final inspection. An experienced manufacturer can coordinate these factors as one complete production system.

Jiangsu Wopeng Power Technology combines engineering personnel, technical specialists, production professionals, automated equipment, vacuum casting systems, CNC machining, and standardized inspection procedures. This combination supports stable manufacturing and enables the company to respond to different installation conditions.

The company’s product range allows customers to source related power transmission products from one specialized supplier. In addition to epoxy resin vacuum-cast tubular busbars, its portfolio includes low-voltage cast resin busway, copper and aluminum tubular busbars, wind power tubular busbars, compact busbar systems, and sliding contact line systems.

A broad product portfolio is valuable when a project includes multiple voltage levels or different distribution zones. Engineering coordination can help maintain consistent design principles for insulation, grounding, identification, connection hardware, and maintenance documentation across the complete installation.

14. Conclusion

Epoxy Resin Casting Tubular Bus Bar is a dependable solution for medium- and high-current power transmission where insulation safety, compact routing, mechanical strength, and environmental resistance are essential. Its integrated vacuum casting process creates a monolithic insulation system with reduced interfaces and consistent factory-controlled quality.

The use of high-purity copper conductors, semiconductive layers, metal shielding, welded grounding connections, embedded stainless steel clamp welding, and flexible bolted equipment connections supports stable electrical and mechanical performance. Flame-retardant properties, aging resistance, moisture protection, corrosion-resistant hardware, and standardized identification further improve suitability for demanding applications.

Compared with bare busbars and many conventional cable arrangements, the product offers a cleaner, more compact, and more protected power route. Compared with separately assembled insulation systems, it reduces the number of interfaces and moves critical insulation production into a controlled manufacturing environment. These advantages make it suitable for substations, transformer connections, switchgear rooms, industrial plants, renewable energy facilities, rail transit systems, data centers, hospitals, and large commercial buildings.

The final performance of any busbar system depends on correct engineering, accurate manufacturing, professional installation, and appropriate testing. By combining advanced vacuum casting equipment, automated production, experienced engineering personnel, standardized quality control, and application-based customization, Jiangsu Wopeng Power Technology provides a strong manufacturing foundation for reliable insulated busbar systems.

References

1. Product technical information for Epoxy Resin Casting Tubular Bus Bar, including structure, materials, insulation thickness, operating conditions, connection requirements, and environmental design parameters.

2. GB/T 5582, Classification of Environmental Conditions for Electrical Equipment and Related Pollution-Level Design Considerations.

3. UL 94, Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances.

4. General engineering principles for medium-voltage and high-voltage busbar systems, including insulation coordination, conductor temperature rise, short-circuit withstand, grounding, and mechanical support.

5. Manufacturer quality-control procedures for vacuum casting, epoxy resin curing, conductor preparation, shielding assembly, mechanical inspection, and electrical routine testing.

Product: Epoxy Resin Casting Tubular Bus Bar