Detailed Information of 11kV XLPE PVC Underground Cable (1X185, 1X300 mm² N2xs2y Na2xs2y)
1. Product-Specific Information
1.1 Specification Parameters
The 11kV XLPE PVC under
Ground Cable, available in models N2xs2y and Na2xs2y, is a high-performance single-
Core Cable engineered specifically for underground power transmission. It comes in two conductor cross-sectional area options: 1X185mm² and 1X300mm², both designed to operate efficiently at the 11kV voltage level, making them ideal for medium-voltage underground applications.
For the 1X185mm² variant, the conductor has a current-carrying capacity of approximately 320A to 380A under standard underground installation conditions (ambient soil temperature of 25°C, thermal resistivity of 1.5 K·m/W). This capacity is well-suited for medium-load underground circuits, such as branch lines in urban distribution networks and power supply lines for small to medium-sized industrial zones. The 1X300mm² conductor, on the other hand, can handle higher currents ranging from 450A to 520A under the same conditions, making it suitable for heavy-load applications like main power supply lines for large industrial facilities and power collection lines in renewable energy projects.
The rated voltage of 11kV indicates that the cable is designed to withstand a phase-to-ground voltage of 6.35kV and a phase-to-phase voltage of 11kV, conforming to international standards for medium-
Voltage Cables. This voltage rating ensures its compatibility with most medium-voltage underground power transmission systems globally.
The XLPE insulation layer has a thickness of 4.0mm to 4.5mm for the 1X185mm² cable and 4.5mm to 5.0mm for the 1X300mm² variant. This
Insulation Material exhibits a dielectric strength of 20kV/mm to 30kV/mm, providing excellent electrical isolation between the conductor and the external environment. It can operate continuously at a maximum conductor temperature of 90°C and can withstand short-term overload temperatures of up to 130°C for durations of 5 seconds, ensuring reliability even during transient high-current events.
The
Copper Conductor is made from high-purity electrolytic copper with a conductivity of at least 58 MS/m at 20°C, minimizing resistive losses during power transmission. The conductor is stranded in a class 2 configuration, which enhances its
Flexibility and makes it easier to handle during installation in underground trenches or pipes.
The overall diameter of the cable varies with the conductor size: the 1X185mm² cable has an outer diameter of approximately 38mm to 42mm, while the 1X300mm² cable measures around 45mm to 49mm. The weight per meter is about 4.8kg for the smaller conductor and 6.5kg for the larger one, which affects handling requirements but remains manageable with
Standard Cable-laying equipment.
The minimum bending radius for fixed installations is 12 times the outer diameter, allowing for flexibility in routing the cable around obstacles in underground environments. For example, the 1X185mm² cable has a minimum bending radius of approximately 456mm, while the 1X300mm² cable has a minimum bending radius of around 540mm.
1.2 Special Features and Applications
The 11kV XLPE PVC underground cable (1X185, 1X300 mm² N2xs2y Na2xs2y) boasts several special features that make it highly suitable for underground power transmission applications.
One of its key features is the use of XLPE insulation, which offers significant advantages over traditional insulation materials. XLPE has excellent thermal stability, allowing it to maintain its electrical and mechanical properties over a wide temperature range. This makes the cable suitable for use in diverse underground environments, from cold climates with temperatures as low as -40°C to warmer regions where soil temperatures can rise significantly. Additionally, XLPE is resistant to moisture ingress, a critical property for
Underground Cables that are constantly exposed to damp conditions. Unlike paper-
Insulated Cables, which require impregnation to prevent moisture damage, XLPE is inherently moisture-resistant, reducing maintenance requirements and extending service life.
The PVC outer sheath provides robust mechanical protection, making the cable highly resistant to abrasion, impact, and corrosion. This is particularly important in underground environments where the cable may come into contact with rocks, soil particles, and various chemicals present in the ground. The
PVC Sheath also offers good flame-retardant properties, meeting the requirements of IEC 60332-3, which helps prevent the spread of fire in case of a cable fault.
The single-core design of the cable minimizes electromagnetic interference (EMI) compared to
Multi-Core cables. This is beneficial in underground installations where the cable may be routed alongside communication cables or other sensitive electrical equipment. The N2xs2y and Na2xs2y models incorporate a copper
Tape Shield, which further enhances EMI protection by containing the electric field within the cable and preventing it from interfering with nearby systems.
In terms of applications, the 1X185mm² cable is widely used in urban distribution networks. It is ideal for supplying power to residential neighborhoods, commercial areas, and small industrial parks through underground trenches or ducts. Its medium current-carrying capacity makes it suitable for these applications where power demand is moderate.
The 1X300mm² cable, with its higher current-handling capability, is commonly deployed in large industrial facilities such as manufacturing plants, refineries, and chemical processing plants. It is used to transmit power from the main substation to various parts of the facility, where heavy machinery and equipment require a reliable supply of high-power electricity.
Renewable energy projects also benefit from these cables. In solar parks, both conductor sizes are used to collect power from solar panels and transmit it to inverters and grid connection points. The 1X300mm² cable is particularly useful in larger solar installations where power generation is higher. In wind farms, these cables are used to connect wind turbines to the collection network, with the robust PVC sheath protecting against the harsh underground conditions often found in wind farm locations.
Municipal engineering projects, such as the construction of new cities, airports, and seaports, rely on these cables for underground power distribution. The cables' durability and resistance to environmental factors ensure reliable power supply to critical infrastructure, including lighting systems, control centers, and utility services.
Another important application is in the upgrading and modernization of existing underground power grids. As urban areas expand and power demand increases, the 11kV XLPE
PVC Underground Cables provide a cost-effective solution for replacing older, less efficient cables, improving the overall reliability and efficiency of the power distribution system.
1.3 Material Selection and Styles
The materials used in the 11kV XLPE PVC underground cable are carefully selected to ensure optimal performance, durability, and safety in underground environments.
The conductor is made from high-purity electrolytic copper (99.9% pure), chosen for its excellent electrical conductivity and mechanical properties. Copper's high conductivity minimizes energy losses during transmission, making the cable more efficient. It also has good ductility, allowing the conductor to be stranded into a flexible configuration that is easy to install. The stranding process involves twisting multiple
Copper Wires together, which not only increases flexibility but also improves heat dissipation by increasing the surface area of the conductor, helping to manage temperature rise during high-current operation.
The insulation layer is composed of cross-linked polyethylene (XLPE), a thermoset material formed by cross-linking linear polyethylene molecules into a three-dimensional network. This cross-linking is achieved through either chemical (peroxide) or radiation (electron beam) methods. Chemical cross-linking involves adding peroxides to the polyethylene, which decompose during heating to form cross-links. Radiation cross-linking uses high-energy electrons to initiate cross-linking without the need for chemical additives. Both methods result in XLPE with superior thermal stability,
Chemical Resistance, and mechanical strength compared to non-cross-linked polyethylene. XLPE is also resistant to aging, ensuring that the insulation maintains its properties over the cable's service life, which is typically 30 years or more.
The shielding layer, a key component of the N2xs2y and Na2xs2y models, is made from copper tape. The copper tape is helically wrapped around the XLPE insulation with an overlap of 15% to 25% to ensure electrical continuity. This shielding serves two main purposes: it equalizes the electric field distribution around the conductor, reducing the risk of partial discharges that can damage the insulation; and it provides a low-impedance path for fault currents to flow to ground, enabling protective devices to operate quickly in the event of a fault.
The inner lining, located between the shielding and the outer sheath, is made from a semi-conductive or non-conductive material, depending on the specific model. Its primary function is to provide additional mechanical protection to the shielding and insulation layers and to ensure a smooth interface between the shielding and the outer sheath.
The outer sheath is made from polyvinyl chloride (PVC), a material known for its excellent mechanical strength, abrasion resistance, and chemical resistance. PVC is also flame-retardant, which is crucial for underground cables to prevent the spread of fire in case of a fault. The PVC sheath is formulated to resist degradation from UV radiation, although this is less critical for underground applications, and to withstand the chemical environment found in soil, including acids, alkalis, and salts.
In terms of styles, the N2xs2y and Na2xs2y models differ slightly in their construction. The N2xs2y typically features a non-armored design, relying on the PVC sheath for mechanical protection. This makes it lighter and more flexible, suitable for installation in protected underground ducts or trenches where the risk of mechanical damage is low. The Na2xs2y, on the other hand, may include an additional armor layer, such as galvanized
Steel Tape or wire, between the shielding and the outer sheath. This armor provides enhanced protection against mechanical damage, making the Na2xs2y model suitable for direct burial in rocky soil or in environments where there is a higher risk of impact or crushing.
1.4 Manufacturing Process
The manufacturing process of the 11kV XLPE PVC underground cable involves several precise steps, each designed to ensure the quality and performance of the final product.
The process begins with the production of the copper conductor. High-purity copper rods are drawn through a series of dies to reduce their diameter to the required size for the individual strands. The drawing process is carefully controlled to ensure that the strands have a uniform diameter and smooth surface, which is essential for maintaining good electrical conductivity. The strands are then stranded together using a stranding machine, which twists them in a specific pattern (class 2 stranding) to form the conductor core. The stranding lay length is optimized to balance flexibility and conductor performance.
Next, the
Stranded Conductor is passed through an extrusion line to apply a semi-conductive layer. This layer is typically made from a mixture of polyethylene and carbon black, which gives it semi-conductive properties. The semi-conductive layer is extruded in a single pass using a cross-head die, ensuring uniform thickness and adhesion to the conductor. Its purpose is to eliminate air gaps between the conductor and the insulation, reducing electric field stress at the interface and preventing partial discharges.
Following the application of the semi-conductive layer, the XLPE insulation is extruded. The XLPE compound, which may contain peroxides for chemical cross-linking, is fed into an extruder where it is melted and mixed to a homogeneous consistency. The molten XLPE is then extruded over the semi-conductive layer using a precision cross-head die, which ensures a uniform insulation thickness. The insulation layer is carefully monitored during extrusion to ensure that it meets the required dimensions and has no defects such as voids or impurities.
After extrusion, the cable undergoes cross-linking. For chemical cross-linking, the cable is passed through a vulcanization tube (also known as a curing tube) where it is heated to a temperature of 200°C to 250°C. This heat causes the peroxides in the XLPE to decompose, forming free radicals that react to form cross-links between the polymer chains. For radiation cross-linking, the cable is exposed to a beam of high-energy electrons from an electron accelerator. The electrons break the molecular bonds in the polyethylene, initiating cross-linking without the need for heat. Cross-linking is a critical step that transforms the thermoplastic polyethylene into a thermoset material with enhanced thermal and mechanical properties.
Once the insulation is cross-linked, the cable moves to the shielding application stage. For the
Copper Tape Shield, a wrapping machine applies the copper tape helically around the insulation with the required overlap. The tape is tensioned to ensure good contact with the insulation, and the edges may be bonded together using heat or adhesive to ensure electrical continuity.
After the shielding is applied, the inner lining is extruded over the shield. This layer is typically a thin layer of polyethylene or PVC, applied using an extrusion process similar to that used for the insulation and semi-conductive layers.
The final step in the manufacturing process is the extrusion of the PVC outer sheath. The PVC compound is melted in an extruder and extruded over the inner lining (or directly over the shielding in non-armored models) using a cross-head die. The sheath is cooled in a water bath to solidify it, and then the cable is pulled through a series of sizing dies to ensure that it has the correct outer diameter.
Throughout the manufacturing process, rigorous quality control checks are performed. These include measurements of conductor resistance, insulation thickness, dielectric strength, and impulse withstand voltage. Samples from each production batch are also subjected to mechanical tests such as tensile strength and elongation, as well as thermal aging tests to ensure that the cable will perform reliably over its service life.
Once the cable passes all quality control checks, it is wound onto reels for storage and transportation. The reels are typically made of wood or steel and are sized according to the length and diameter of the cable.
2. General Product Information
2.1 Packaging
The 11kV XLPE PVC underground cable is packaged to ensure maximum protection during storage, transportation, and handling. The cable is wound onto sturdy reels, which are available in both wooden and steel constructions, depending on the cable length and customer requirements.
Wooden reels are commonly used for shorter cable lengths and are made from high-quality plywood or solid wood, which provides good strength while being lightweight. Steel reels are used for longer lengths or heavier cables, offering superior strength and durability. The reels have flanges at both ends to contain the cable, with flange diameters ranging from 800mm for small reels to 1600mm for large reels. The reel diameter is chosen based on the cable's minimum bending radius to prevent damage during winding and unwinding.
The cable is secured to the reel using steel strapping, which is applied at regular intervals along the length of the reel. The strapping is tensioned to ensure that the cable remains tight and does not shift during transportation. A layer of moisture-resistant paper or plastic film is wrapped around the cable on the reel to protect it from dust, moisture, and UV radiation. This is particularly important for cables that may be stored outdoors or in humid environments before installation.
Each reel is labeled with detailed information, including the cable type, conductor size (1X185mm² or 1X300mm²), model (N2xs2y or Na2xs2y), voltage rating (11kV), length of cable on the reel, batch number, manufacturing date, and compliance with relevant standards (such as IEC 60502). This information allows for easy identification and traceability of the cable. Additionally, handling instructions are printed on the reel, including the maximum weight of the reel, proper lifting points, and warnings against dropping or mishandling.
For customers who require smaller quantities, the cable can also be supplied in coils of 50m, 100m, or 200m lengths. These coils are wrapped in heavy-duty plastic film and placed in cardboard boxes for protection. The boxes are labeled with the same information as the reels, ensuring that the cable can be easily identified and tracked.
2.2 Transportation
Transporting the 11kV XLPE PVC underground cable requires careful planning to ensure that the cable and reels arrive at their destination in good condition. The reels are typically transported by road, rail, or sea, depending on the distance and destination.
For road transportation, the reels are loaded onto flatbed trucks or trailers. The reels are secured using chains or straps that are attached to the truck's bed, ensuring that they cannot move during transit. The trucks are equipped with air suspension to minimize vibration, which can damage the cable or loosen the strapping. The reels are placed in a way that distributes the weight evenly across the truck, preventing overloading of any single axle.
When transporting by rail, the reels are loaded into railcars designed for carrying heavy cargo. Similar securing methods are used as for road transportation, with chains or straps securing the reels to the railcar's floor. Rail transportation is often more cost-effective for long-distance shipments and reduces the risk of delays caused by traffic congestion.
For international shipments, the reels are loaded into shipping containers. 20-foot or 40-foot containers are used, depending on the size and number of reels. The reels are secured to the container's floor using twist locks or steel straps to prevent movement during sea transport. The containers may be ventilated to prevent moisture buildup, which can lead to corrosion of the reels or damage to the cable's sheath. For shipments to areas with high humidity or salt exposure, such as coastal regions, the reels may be treated with anti-corrosion coatings to provide additional protection.
During transportation, the cable must be protected from extreme temperatures. In hot climates, the cable should be shaded to prevent the PVC sheath from softening, which can lead to deformation. In cold climates, the cable should be protected from freezing, as cold temperatures can make the PVC sheath brittle and prone to cracking. Transportation companies are instructed to avoid sudden stops, starts, or turns that could cause the reels to tip over or the cable to unwind.
Upon arrival at the destination, the reels are inspected for any signs of damage, such as broken flanges, loose strapping, or tears in the protective wrapping. Any damage is documented, and if necessary, the cable is inspected for internal
damage before being accepted. Any discrepancies or issues are reported to the manufacturer and transportation provider to facilitate timely resolution.
2.3 Shipment and Delivery
The shipment and delivery process for the 11kV XLPE PVC underground cable is designed to ensure efficiency, transparency, and customer satisfaction. Upon receiving an order, the manufacturer confirms the specifications, including conductor size (1X185mm² or 1X300mm²), model (N2xs2y or Na2xs2y), and quantity, and schedules production or retrieves the cable from inventory if it is a standard item.
Once the cable is ready for shipment, the customer is provided with a detailed packing list and a bill of lading. The packing list includes information such as the number of reels, total length of cable, weight per reel, and any special handling instructions. The bill of lading serves as a legal document confirming the contract of carriage, detailing the consignor, consignee, destination, and description of the goods.
For domestic shipments, the cable is typically delivered within 3 to 7 business days via road or rail, depending on the distance from the manufacturing facility. For international shipments, delivery times vary based on the destination, with typical transit periods ranging from 2 to 6 weeks, including customs clearance. Customers are provided with a tracking number to monitor the shipment’s progress in real time through the manufacturer’s online portal or the transportation provider’s tracking system.
Partial shipments are available for large orders, allowing customers to receive portions of their order according to their project timeline. This flexibility is particularly valuable for construction projects, where cable requirements may be phased. The manufacturer coordinates with the customer to schedule partial deliveries, ensuring that each shipment is labeled and documented separately for easy inventory management.
Upon delivery, the customer is required to inspect the shipment within 48 hours to verify that the cable matches the order specifications and is free from damage. If any issues are identified, the customer must notify the manufacturer in writing, providing photographs and a detailed description of the problem. The manufacturer then works with the customer to arrange for replacements, repairs, or refunds as appropriate.
2.4 Samples
To assist customers in evaluating the 11kV XLPE PVC underground cable before placing a full order, the manufacturer offers sample cables. Samples are typically 1 to 5 meters in length and include all layers of the cable, from the copper conductor to the PVC outer sheath, ensuring they accurately represent the final product.
Samples are processed through the same manufacturing and quality control procedures as full-length cables to guarantee consistency. They are labeled with the same information as production reels, including conductor size, model, voltage rating, batch number, and compliance with standards such as IEC 60502. This allows customers to conduct independent testing, such as measuring conductor resistance, insulation thickness, or flame retardancy, to verify performance against their requirements.
Sample requests can be made through the manufacturer’s sales team or online portal. There may be a nominal fee for samples, which is often refundable if a subsequent order of a specified quantity is placed. Samples are shipped via express courier to ensure prompt delivery, with tracking information provided to the customer. The manufacturer also offers technical support to assist customers in conducting tests or interpreting results, ensuring they have all the information needed to make an informed purchasing decision.
2.5 After-Sales Service
The manufacturer provides comprehensive after-sales service to support customers throughout the lifecycle of the 11kV XLPE PVC underground cable. This includes technical assistance, warranty coverage, and maintenance support.
Technical support is available via phone, email, or on-site visits. A team of qualified engineers offers guidance on installation best practices, including cable laying techniques, termination methods, and jointing procedures specific to underground applications. They can also provide advice on cable selection for specific environments, such as high-moisture soils or areas with high chemical exposure, ensuring optimal performance and longevity.
The cable is backed by a 10-year warranty against defects in materials and workmanship. The warranty covers issues such as insulation breakdown due to manufacturing flaws, conductor defects, or premature sheath degradation. To claim warranty service, customers must provide proof of purchase and a detailed report of the issue, including photographs and test data if available. The manufacturer conducts an investigation to determine the cause of the problem and, if covered under warranty, arranges for replacement or repair at no cost to the customer.
For out-of-warranty issues or damage caused by improper installation or external factors, the manufacturer offers repair services at competitive rates. This includes services such as cable splicing, sheath repair, and shield restoration, performed by trained technicians using specialized equipment to ensure compliance with industry standards.
The manufacturer also provides ongoing maintenance recommendations to help customers maximize the cable’s service life. This includes guidelines for periodic inspections, such as checking for sheath damage, measuring insulation resistance, and monitoring for signs of corrosion. They can also arrange for third-party testing services to assess the cable’s condition, providing customers with detailed reports and recommendations for preventive maintenance.
Customer feedback is actively sought and used to improve product design and service quality. A dedicated customer service team addresses inquiries and complaints promptly, ensuring that any issues are resolved to the customer’s satisfaction. This commitment to after-sales support reinforces the manufacturer’s reputation for reliability and builds long-term partnerships with customers.
In summary, the 11kV XLPE PVC underground cable (1X185, 1X300 mm² N2xs2y Na2xs2y) combines advanced materials, precise manufacturing, and robust design to deliver exceptional performance in underground power transmission. Its comprehensive packaging, transportation, and after-sales services ensure that customers receive a high-quality product that meets their needs and performs reliably for decades, making it a trusted choice for medium-voltage underground applications worldwide.
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