Detailed Description of Cu/XLPE/Cts/PVC 8.7/15kV 350 Mcm 175mm² 133% BIL 3-Core Power Cable
1. Product-Specific Information
1.1 Specification Parameters
The Cu/XLPE/Cts/PVC 8.7/15kV 3-core power cable is engineered with precise specifications to ensure optimal performance in medium to high-voltage power transmission systems. At its core, the conductors are made of high-purity copper (Cu), a material renowned for its exceptional electrical conductivity (approximately 58 MS/m at 20°C) and low resistivity, which minimizes energy loss during transmission. The conductor size is specified in both imperial and metric units: 350 thousand circular mils (Mcm) and 175 square millimeters (mm²). These two measurements are functionally equivalent, with 350 Mcm corresponding to a cross-sectional area that aligns closely with 175 mm², ensuring the cable can handle substantial current loads—typically up to 400-500 amperes under standard operating conditions, depending on installation environment and cooling factors.
The cable’s rated voltage is 8.7/15kV, where the first value (8.7kV) represents the phase-to-ground voltage, and the second (15kV) denotes the phase-to-phase voltage. This rating positions it as a medium-
Voltage Cable, suitable for applications such as distribution networks in industrial parks, commercial complexes, and urban infrastructure projects. The impulse withstand voltage (BIL) of 133% indicates enhanced resilience against transient overvoltages, such as those caused by lightning strikes or switching operations. This exceeds standard industry thresholds, providing an additional layer of protection to prevent insulation breakdown and ensure uninterrupted power supply.
The overall construction of the cable includes multiple layers, each serving a critical function. The
Copper Conductors are stranded to enhance
Flexibility, allowing for easier handling and installation in various scenarios, including tight bends and confined spaces. Over the conductors lies the insulation layer, composed of cross-linked polyethylene (XLPE). XLPE is chosen for its superior electrical properties, including high dielectric strength (typically around 20-30 kV/mm) and low dielectric loss, which ensures efficient power transmission with minimal energy dissipation. Additionally, XLPE exhibits excellent thermal resistance, enabling the cable to operate at continuous temperatures up to 90°C, with short-term overload capabilities up to 130°C, making it suitable for high-demand applications.
Beneath the insulation, a copper
Tape Shield (Cts) is applied. This shield serves two primary purposes: first, it equalizes the electric field distribution around the conductor, preventing concentration points that could lead to insulation degradation over time; second, it acts as a barrier against electromagnetic interference (EMI), reducing the cable’s impact on nearby sensitive electronic equipment and minimizing interference from external sources. The copper tape is helically wrapped or longitudinally applied with overlaps to ensure complete coverage and electrical continuity, providing a low-impedance path for fault currents to flow to ground, thereby enhancing safety during fault conditions.
The outermost layer is a polyvinyl chloride (PVC) sheath, which provides robust mechanical protection and resistance to environmental factors. PVC is known for its durability, offering excellent resistance to abrasion, chemicals, and moisture. It also exhibits good flame-retardant properties, meeting industry standards for fire safety, which is crucial in applications where fire risk is a concern, such as in buildings or industrial facilities. The
PVC Sheath contributes to the cable’s overall flexibility, allowing for easy installation while maintaining structural integrity under various stress conditions.
1.2 Special Features and Applications
One of the key features of this cable is its balanced combination of electrical performance and mechanical durability, making it versatile across a range of applications. Its 3-core design is particularly advantageous for three-phase power systems, which are standard in most industrial and commercial power distribution networks. The three cores are twisted together to reduce electromagnetic radiation and crosstalk between phases, ensuring stable and efficient power transmission.
In terms of applications, the cable is well-suited for underground installations, including direct burial and duct laying. Its PVC sheath provides excellent protection against soil corrosion, root intrusion, and mechanical damage from digging or ground movement. This makes it ideal for urban distribution networks, where underground cabling is preferred to avoid the visual impact and weather vulnerability of
Overhead Lines. Additionally, the cable can be used in indoor installations, such as within industrial plants, where it can be routed through cable trays or conduits, thanks to its flexibility and flame-retardant properties.
Another notable feature is its high BIL rating of 133%, which makes it particularly suitable for regions prone to lightning activity or areas with frequent switching operations, such as renewable energy facilities (e.g., wind farms or solar parks) where power flow is often interrupted and restarted. The enhanced impulse withstand capability reduces the risk of downtime due to insulation failure, ensuring reliable power delivery to critical loads.
The use of XLPE insulation also offers long-term performance benefits. Unlike traditional polyethylene, XLPE undergoes a cross-linking process that transforms its molecular structure into a three-dimensional network, improving its thermal stability,
Chemical Resistance, and mechanical strength. This cross-linking ensures that the insulation retains its properties over a long service life—typically 30 years or more—even under continuous operation, reducing the need for frequent replacement and lowering lifecycle costs.
Furthermore, the
Copper Tape Shield enhances system safety by providing an effective ground path. In the event of a fault, such as a short circuit or insulation breakdown, the shield conducts fault currents to ground, triggering protective devices (e.g., circuit breakers) to isolate the fault and prevent damage to equipment or risk of electric shock. This feature is critical in ensuring the safety of personnel and infrastructure in both industrial and commercial settings.
1.3 Material Selection and Manufacturing Process
The materials used in the cable are carefully selected to meet stringent performance and safety standards. The
Copper Conductors are manufactured from high-grade electrolytic copper, which undergoes rigorous purification to reduce impurities that could hinder conductivity. The copper is then drawn into strands of precise diameter, which are twisted together to form the conductor core. This stranding process enhances flexibility, making the cable easier to bend and install without compromising structural integrity.
The XLPE insulation is applied using an extrusion process, where molten XLPE is uniformly extruded over the conductor. Following extrusion, the insulation undergoes a cross-linking process, typically using either chemical agents or high-energy electron beams. Chemical cross-linking involves adding peroxides to the XLPE, which decompose during heating to form cross-links between polymer chains. Electron beam cross-linking uses high-energy electrons to break molecular bonds, initiating cross-linking without the need for chemical additives. Both methods result in a thermoset
Insulation Material that retains its shape and properties even at elevated temperatures, unlike thermoplastic materials that soften when heated.
The copper tape shield is applied over the XLPE insulation using a wrapping machine that ensures uniform coverage with precise overlap (typically 15-25% of the tape width) to maintain electrical continuity. The copper tape is thin (usually 0.1-0.3 mm thick) yet strong enough to provide effective shielding and mechanical support. After application, the shield is often bonded to the insulation or sheath to prevent movement during installation or operation.
The PVC sheath is extruded over the copper tape shield in a final extrusion step. The PVC compound is formulated to meet specific requirements for flexibility, impact resistance, and flame retardancy. Additives such as plasticizers are included to enhance flexibility, while flame retardants (e.g., antimony trioxide, aluminum hydroxide) are added to meet fire safety standards such as IEC 60332 or UL 94. The extrusion process ensures a smooth, continuous sheath with consistent thickness, providing uniform protection around the cable core.
Throughout the manufacturing process, strict quality control measures are implemented. Each batch of materials is tested for compliance with specifications, including conductivity for copper, dielectric strength for XLPE, and mechanical properties for PVC. In-process testing includes measurements of insulation thickness, conductor resistance, and shield continuity. Final testing of the finished cable includes high-voltage withstand tests (both AC and impulse), partial discharge measurements, and mechanical tests (e.g., tensile strength, elongation at break) to ensure compliance with international standards such as IEC 60502, IEEE 525, or ANSI/ICEA S-94-649.
2. General Product Information
2.1 Packaging
The cable is packaged to ensure protection during storage, handling, and transportation. For standard lengths (typically 500 meters or 1000 meters per reel), the cable is wound onto sturdy wooden or steel reels. Wooden reels are often used for their lightweight properties and ease of disposal, while steel reels are preferred for heavier cables or long-distance transportation due to their higher strength. The reels are designed with flanges to prevent the cable from slipping off during handling, and the cable is secured with steel bands or plastic straps to maintain tension and prevent loosening.
Each reel is labeled with detailed information, including the cable type, specification (e.g., 8.7/15kV, 350 Mcm/175mm²), length, batch number, manufacturing date, and compliance with relevant standards (e.g., IEC, IEEE). This information allows for easy identification and traceability. Additionally, the reels are wrapped in a protective layer of plastic film or hessian cloth to shield the cable from dust, moisture, and sunlight during storage and transportation.
For shorter lengths or sample quantities, the cable may be coiled and packaged in heavy-duty cardboard boxes or plastic crates, lined with foam or bubble wrap to prevent damage. These packages are also labeled with the same detailed information as the reels, ensuring clarity for the recipient.
2.2 Transportation and Shipping
The transportation of the cable is handled with care to avoid damage to the reels or the cable itself. For domestic shipments, the reels are loaded onto trucks using forklifts or cranes, with appropriate securing devices (e.g., chains, straps) to prevent movement during transit. The trucks are often equipped with flatbeds or enclosed trailers, depending on the weather conditions and the need for additional protection.
For international shipments, the cable reels are loaded into shipping containers, which are either 20-foot or 40-foot in length, depending on the reel size and quantity. The reels are secured within the container using dunnage (e.g., wooden blocks, airbags) to prevent shifting during sea or air transport. Special attention is paid to ensuring that the reels do not exceed weight limits for containerized shipping, and proper documentation (e.g., bill of lading, packing list, certificates of compliance) is provided to facilitate customs clearance.
During transportation, the cable must be protected from extreme temperatures, moisture, and mechanical impact. Shipping companies are selected based on their experience in handling
Industrial Cables and their ability to provide tracking information, allowing customers to monitor the progress of their shipment.
2.3 Sample Provision
Samples of the cable are available upon request to allow customers to evaluate its quality and suitability for their specific applications. Sample lengths typically range from 1 to 5 meters, depending on the customer’s requirements. The samples are prepared using the same manufacturing processes and materials as the full-length cables, ensuring that they accurately represent the product’s properties.
To request a sample, customers can contact the sales team via email, phone, or the company’s website, providing details such as the cable type, specification，and intended application. The sales team will then process the request and arrange for the sample to be shipped within a specified timeframe (usually 3-7 business days for domestic shipments and 7-14 business days for international shipments).
Samples may be subject to a nominal fee to cover processing and shipping costs, although this fee is often waived for serious potential customers or large-volume orders. Upon receipt of the sample, customers are encouraged to conduct their own tests, such as measuring conductor diameter, checking insulation thickness, or evaluating flexibility, to ensure that the cable meets their expectations.
2.4 After-Sales Service
The company is committed to providing comprehensive after-sales service to ensure customer satisfaction. This includes technical support, warranty coverage, and assistance with installation and maintenance.
Technical support is available via a dedicated team of engineers who can provide guidance on cable selection, installation procedures, and troubleshooting. Customers can contact the technical support team via phone, email, or video conference to address any questions or concerns they may have. The team can also provide technical documentation, such as installation manuals, datasheets, and compliance certificates, to assist customers in ensuring proper use of the cable.
Warranty coverage for the cable typically ranges from 10 to 15 years, depending on the application and installation conditions. The warranty covers defects in materials and workmanship, ensuring that any issues arising from manufacturing faults are addressed promptly. In the event of a warranty claim, the company will arrange for an inspection of the cable to determine the cause of the problem. If the issue is covered under warranty, the company will provide a replacement cable or arrange for repairs at no additional cost.
Assistance with installation and maintenance is also available. The company can recommend qualified installers who are experienced in handling medium-voltage cables, ensuring that the installation is carried out in accordance with industry standards and best practices. Additionally, the company can provide guidance on maintenance procedures, such as regular inspections, testing, and cleaning, to help extend the service life of the cable and ensure optimal performance.
In cases where customers encounter problems with the cable that are not covered under warranty (e.g., damage due to improper installation or external factors), the company can still provide support by offering replacement parts or repair services at a reasonable cost. The goal is to ensure that customers receive the necessary assistance to keep their power systems running smoothly.
2.5 Storage and Handling Guidelines
Proper storage and handling of the cable are essential to maintain its performance and longevity. When storing the cable reels, they should be placed in a dry, well-ventilated area, protected from direct sunlight, extreme temperatures, and moisture. The reels should be stored horizontally on flat surfaces, with wooden blocks placed between them to prevent rolling. It is important to avoid stacking reels, as this can cause damage to the lower reels or the cable itself.
When handling the cable, care should be taken to avoid excessive bending or kinking, which can damage the insulation or conductors. The minimum bending radius for the cable is specified in the technical datasheet (typically 12-15 times the cable diameter for static bending and 20-25 times for dynamic bending). The cable should be unrolled from the reel using appropriate equipment, such as a reel stand or winch, to prevent twisting or tangling.
During installation, the cable should be protected from sharp objects, abrasion, and chemical exposure. It should not be dragged over rough surfaces, and any cuts or damage to the sheath should be repaired immediately using approved repair kits to prevent moisture ingress. Proper grounding of the copper tape shield is also crucial to ensure effective fault current handling and EMI protection, and installers should follow the recommended grounding procedures outlined in the installation manual.
In summary, the Cu/XLPE/Cts/PVC 8.7/15kV 3-core power cable is a high-performance, reliable solution for medium-voltage power transmission, combining advanced materials, precise manufacturing, and comprehensive support services to meet the diverse needs of industrial, commercial, and infrastructure applications. Its robust design, combined with careful packaging, reliable transportation, and dedicated after-sales support, ensures that it delivers consistent performance throughout its service life.
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