Manufacturer of 26/35 Kv Na2xs (f) 2y XLPE Cable Aluminum

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2025-09-12 07:12:06

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1. Product-Specific Details

1.1 Specifications and Parameters

The 26/35kV Na2xs (f) 2y XLPE Cable with Aluminum Conductor is engineered to meet high-voltage power transmission requirements, with precise specifications ensuring reliability in medium to high-voltage networks.

Rated at 26/35kV, the cable operates with a phase-to-earth voltage of 26kV and a phase-to-phase voltage of 35kV, making it suitable for substation connections, industrial power grids, and renewable energy installations. The Aluminum Conductors are available in various cross-sectional areas, typically ranging from 50mm² to 400mm², though common sizes include 70mm², 120mm², 185mm², and 240mm².

Current-carrying capacity varies by conductor size and installation conditions. For example, a 120mm² conductor can handle approximately 220A in air (ambient temperature 40°C) and 180A when buried underground (soil temperature 25°C). A 240mm² conductor, by contrast, supports 320A in air and 260A underground. These values account for thermal dissipation, ensuring the cable avoids overheating under continuous load.

The XLPE insulation layer has a thickness proportional to the voltage rating: 5.0mm for 50–120mm² conductors and 6.0mm for 185–400mm² conductors. This insulation offers a dielectric strength of ≥20kV/mm and operates at a maximum continuous temperature of 90°C, with short-circuit tolerance up to 250°C for 5 seconds.

The cable features a concentric copper screen (or Aluminum Wire screen) with a thickness of 0.1mm–0.3mm, ensuring uniform electric field distribution and minimizing partial discharges. The outer sheath, typically made of PE (polyethylene) or PVC, has a thickness of 2.5mm–4.0mm, providing mechanical protection and resistance to moisture, chemicals, and UV radiation.

Overall diameter ranges from 28mm (50mm²) to 55mm (400mm²), with weight per meter varying from 1.8kg to 7.5kg. The minimum bending radius is 12× the overall diameter for fixed installations and 20× for flexible applications, facilitating easy routing in tight spaces.

1.2 Special Purpose

The 26/35kV Na2xs (f) 2y XLPE cable with aluminum conductor is designed for specialized high-voltage applications, combining Flexibility, durability, and efficiency.

In industrial facilities, such as manufacturing plants and refineries, it serves as a backbone for power distribution, connecting transformers to heavy machinery and switchgear. Its aluminum conductor reduces weight, easing installation in complex layouts, while XLPE insulation withstands the high temperatures and chemical exposure common in these environments.

Renewable energy projects, including wind farms and solar parks, rely on this cable to transmit power from generators to collection substations. The 26/35kV rating matches the output of medium-voltage inverters, and its UV-resistant sheath ensures longevity in outdoor settings.

Urban power grids use the cable for underground distribution, linking substations to commercial districts and high-rise residential areas. Its compact design allows installation in ducts or direct burial, reducing disruption to urban infrastructure. The concentric screen minimizes electromagnetic interference, protecting sensitive equipment like smart grid sensors.

In infrastructure projects—such as airports, seaports, and railways—the cable provides reliable grounding and power transfer. Its flexibility enables routing around structures, while the robust sheath resists damage from vibration, impact, and exposure to fuels or de-icing salts.

1.3 Materials and Styles

The cable’s materials are selected for performance and compatibility with high-voltage operations, while its design accommodates diverse installation needs.

Conductor: High-purity aluminum (99.5%+) with a minimum conductivity of 61% IACS. Stranded construction (class 2 or 5) enhances flexibility, making the cable suitable for both fixed and semi-flexible applications. Aluminum’s low density reduces installation stress compared to copper, ideal for long-span or overhead use.

Insulation: Cross-linked polyethylene (XLPE) undergoes radiation or chemical cross-linking, creating a three-dimensional molecular structure. This imparts thermal stability, Chemical Resistance, and low dielectric loss—critical for maintaining efficiency at 35kV.

Screen: Concentric copper tape or aluminum wire screen. Copper offers superior conductivity for electric field control, while aluminum provides a cost-effective alternative with comparable performance. The screen is bonded to the insulation to prevent partial discharges.

Sheath: PE or PVC. PE is preferred for outdoor or underground use due to its moisture resistance and UV stability; PVC is chosen for indoor applications requiring flame retardancy. Both materials resist abrasion and corrosion, extending cable life.

Styles include single-core and Multi-Core variants, though the Na2xs (f) 2y designation typically refers to single-core designs. Color coding (e.g., black sheath) ensures easy identification in complex installations, while optional armoring (steel wire or tape) is available for extra mechanical protection in harsh environments.

1.4 Production Process

Manufacturing follows stringent protocols to ensure compliance with standards like IEC 60502-2, involving:

Conductor Stranding: Aluminum rods are drawn into wires, then stranded using a planetary stranding machine. Stranding patterns (e.g., concentric layers) optimize flexibility and current distribution.

XLPE Insulation Extrusion: The conductor is passed through an extrusion line where molten XLPE is applied. Precision dies control insulation thickness, ensuring uniformity. Cross-linking follows—either via electron beam radiation (for faster processing) or chemical curing in a vulcanization tube (for large-scale production).

Screen Application: A copper tape is helically wrapped around the insulation, or Aluminum Wires are concentrically applied. The screen is grounded to dissipate fault currents.

Sheath Extrusion: PE or PVC is extruded over the screen using a tandem extrusion line. The sheath is cooled in a water bath and tested for thickness and adhesion.

Quality Testing: Each cable undergoes partial discharge testing (≤10pC at 1.73× rated voltage), AC voltage withstand tests (30 minutes at 70kV), and insulation resistance measurements (≥10,000MΩ). Mechanical tests (tensile strength, elongation) ensure sheath and insulation durability.

2. General Product Information

2.1 Packaging

Cables are packaged to protect against damage during storage and transit:

Reels: Steel or wooden reels with flanges sized to the cable diameter. Reels for 50–120mm² cables have 1.2m flanges; larger sizes use 1.5–2.0m flanges. Reels are labeled with specifications (voltage, conductor size, length) and compliance marks (IEC, CE).

Protection: Cable ends are sealed with heat-shrink caps to prevent moisture ingress. Reels are wrapped in waterproof plastic film, and wooden reels are treated to meet ISPM 15 standards for international shipping.

Palletization: Smaller reels (≤500m) are palletized and secured with steel straps. Large reels may be shipped individually in containers, braced to prevent movement.

2.2 Transportation

Logistics focus on preserving cable integrity:

Domestic Transport: Flatbed trucks with reel stands. Cables are secured with chains and chocks to prevent rolling. Temperature-controlled trucks are used for sensitive XLPE insulation in extreme climates.

International Shipping: Containerized sea freight for bulk orders. Reels are loaded using cranes, with dunnage bags filling gaps to avoid shifting. Air freight is available for urgent, small-volume orders, using lightweight crates.

Handling: Forklifts or cranes with reel hooks are used, avoiding bending beyond the minimum radius. Drivers receive training to prevent abrupt stops or impacts.

2.3 Delivery

Delivery processes ensure timely, traceable fulfillment:

Lead Times: 2–4 weeks for standard sizes; 6–8 weeks for custom orders (e.g., armored variants). Manufacturers maintain stock of popular sizes (120mm², 185mm²) for quick dispatch.

Tracking: Customers receive a unique tracking number via email, allowing real-time monitoring through the logistics provider’s portal. Updates include departure, transit milestones, and estimated delivery.

Receipt Inspection: Upon delivery, customers verify reel condition, cable length, and end seals. Damaged shipments are documented with photos, and replacements are arranged within 48 hours.

2.4 Samples

Samples are provided to validate quality and compatibility:

Sample Details: 1–3m lengths of the requested conductor size, including all layers (conductor, insulation, screen, sheath). Samples are labeled with batch numbers for traceability.

Request Process: Customers submit requests via email or the manufacturer’s website, specifying size and quantity. Samples are free for qualified buyers, with shipping costs waived for bulk order commitments.

Delivery: Shipped via express courier (DHL, FedEx) within 3–5 business days. Samples are packaged in rigid tubes to prevent bending.

2.5 After-sales Service

Comprehensive support ensures long-term performance:

Technical Assistance: Engineers provide installation guides, termination recommendations, and on-site training. They assist with fault diagnosis (e.g., using partial discharge detectors) and recommend repairs.

Warranty: 15-year warranty covering manufacturing defects. Claims are processed within 5 business days, with replacements or refunds issued based on inspection results.

Maintenance: Optional annual check-ups, including insulation resistance testing and sheath integrity checks. Manufacturers offer replacement parts (e.g., screen connectors, heat-shrink kits) at discounted rates.

Feedback: A dedicated portal allows customers to report issues or suggest improvements, with responses within 24 hours. This input informs product upgrades, such as enhanced sheath UV resistance for tropical markets.

This 26/35kV Na2xs (f) 2y XLPE cable combines advanced materials, precision manufacturing, and robust support to meet the demands of high-voltage power networks, ensuring safe, efficient, and reliable operation.