1. Product-Specific Details
1.1 Specifications and Parameters
The 12/20kV 3-core
Aluminum Conductor Medium voltage cables, including the Ahxamk-W and Ahxamk-Wp variants, come with a set of precise specifications and parameters to ensure their reliable performance in medium-voltage power transmission and distribution systems.
The voltage rating of 12/20kV indicates that the cable can withstand a phase-to-earth voltage of 12kV and a phase-to-phase voltage of 20kV, making it suitable for medium-voltage applications where this level of electrical stress is common. This rating ensures compatibility with medium-voltage distribution networks that connect substations to various end-users.
Each of the three
Aluminum Conductors has a specific cross-sectional area, which varies depending on the intended current-carrying capacity. Common conductor sizes for these cables range from 25mm² to 400mm². For example, a 50mm² aluminum conductor can carry a current of approximately 120A under normal operating conditions (ambient temperature of 40°C). A 120mm² conductor can handle around 220A, while a 400mm² conductor can carry up to 420A. These current-carrying capacities may vary slightly based on factors such as installation method (air, underground, or in ducts) and ambient temperature. In higher ambient temperatures, the current-carrying capacity may decrease by 5-10% to prevent overheating.
The XLPE insulation has a thickness that is proportionate to the conductor size and voltage rating. For a 50mm² conductor in a 12/20kV cable, the insulation thickness is typically around 2.5mm. As the conductor size increases, the insulation thickness also increases. For a 400mm² conductor, the insulation thickness can be up to 4.5mm. This ensures that the insulation can effectively withstand the electrical stress and prevent breakdown. The XLPE insulation has a dielectric strength of at least 20kV/mm, which is crucial for maintaining reliable insulation performance.
The XLPE screen layer, a semi-conductive layer, has a thickness of approximately 0.5mm. It is designed to have a resistivity of less than 100Ω·m, ensuring effective electric field distribution. This layer is in intimate contact with the XLPE insulation to prevent partial discharges at the interface.
The PE outer sheath has a thickness ranging from 2.0mm for smaller conductor sizes to 3.5mm for larger ones. The PE sheath has a tensile strength of at least 12MPa and an elongation at break of not less than 200%, ensuring
Flexibility and durability. It also has good resistance to environmental stress cracking, which is important for long-term reliability in outdoor and underground installations.
The overall diameter of the cables varies with conductor size. A 50mm² 3-
Core Cable has an overall diameter of approximately 40mm, while a 400mm² 3-core cable can have an overall diameter of around 80mm. The weight per meter of the cables also increases with conductor size, ranging from approximately 1.5kg/m for 50mm² to 8.0kg/m for 400mm².
The minimum bending radius for these cables is 12 times the overall diameter for fixed installations and 20 times for flexible installations. For example, a 50mm² cable with an overall diameter of 40mm has a minimum bending radius of 480mm for fixed laying and 800mm for flexible use, allowing for easy routing during installation.
1.2 Special Purpose
The 12/20kV 3-core aluminum conductor
Medium Voltage Cables (Ahxamk-W and Ahxamk-Wp) are designed to serve a wide range of special purposes in various industries and applications, thanks to their unique combination of features.
In urban power distribution networks, these cables are essential for connecting substations to commercial centers, residential areas, and public facilities. The 3-core design is ideal for three-phase power systems, ensuring balanced power supply to meet the high electricity demands of cities. For example, in downtown areas with high-rise buildings, shopping malls, and office complexes, these cables efficiently transmit power from the substation to the local distribution transformers, which then step down the voltage to low-voltage levels for end-users. The Ahxamk-W variant, with its standard PE sheath, is suitable for underground installation in ducts or direct burial in urban areas where there is limited space for
Overhead Lines.
Industrial facilities, such as manufacturing plants, refineries, and chemical factories, rely on these medium
Voltage Cables to power heavy machinery and equipment. The high current-carrying capacity of larger conductor sizes (like 400mm²) makes them suitable for supplying power to large motors, furnaces, and processing units. The XLPE insulation's ability to withstand high temperatures ensures reliable operation even in the hot environments of industrial plants. The XLPE screen layer prevents electromagnetic interference, which is crucial for the proper functioning of sensitive industrial control systems. The Ahxamk-Wp variant, with its enhanced properties (possibly improved flame retardancy), is particularly suitable for use in industrial areas where fire safety is a major concern.
Renewable energy installations, such as wind farms and solar power plants, also utilize these cables. In wind farms, they connect the wind turbines to the collection substation, transmitting the generated electricity at medium voltage. The lightweight aluminum conductors reduce the load on the supporting structures, which is important in the often remote and exposed locations of wind farms. The PE sheath's resistance to UV radiation and moisture ensures durability in outdoor environments. In solar power plants, these cables are used to connect the solar panels to the inverters and then to the grid, efficiently transmitting the generated power.
Infrastructure projects, including airports, seaports, and railways, depend on these medium voltage cables for reliable power supply. Airports use them to power runway lighting, terminal buildings, and air traffic control systems. The cables' ability to operate in harsh environments, such as exposure to fuel spills and extreme temperatures, makes them suitable for airport applications. Seaports use them to power cranes, container handling equipment, and lighting systems, with the PE sheath providing protection against saltwater corrosion. Railways utilize these cables to supply power to signaling systems, stations, and electric trains, ensuring safe and efficient operation.
1.3 Materials and Styles
The materials used in the 12/20kV 3-core aluminum conductor medium voltage cables are carefully selected to meet the demanding requirements of medium-voltage applications, and they come in various styles to suit different installation needs.
The conductors are made of high-purity aluminum (99.5% purity or higher) with a minimum conductivity of 61% IACS (International Annealed Copper Standard). Aluminum is chosen for its favorable balance of conductivity, lightweight, and cost-effectiveness. Compared to copper, aluminum has a lower density, which reduces the overall weight of the cable, making installation easier and reducing the stress on supporting structures. The aluminum conductors are stranded, consisting of multiple small
Aluminum Wires twisted together. This stranded design enhances the flexibility of the cables, allowing for easier bending during installation. It also improves the cable's resistance to fatigue from vibration, which is important in applications such as industrial machinery or railway systems.
XLPE (cross-linked polyethylene) is used as the
Insulation Material due to its superior properties. XLPE is a thermosetting polymer that undergoes a cross-linking process, which gives it excellent thermal stability. It can operate at continuous temperatures up to 90°C and withstand short-circuit temperatures of 250°C for up to 5 seconds, making it suitable for high-heat environments. XLPE also has good
Chemical Resistance, being unaffected by most industrial chemicals, oils, and solvents. Its low dielectric loss ensures minimal energy loss during power transmission, which is crucial for medium-voltage applications where efficiency is important.
The XLPE screen layer is a semi-conductive material that is compatible with the XLPE insulation. It is designed to have a similar thermal expansion coefficient to the insulation, ensuring good contact even under temperature changes. The semi-conductive nature of the screen layer allows it to conduct any surface charges, preventing the buildup of electric fields that could cause partial discharges.
The outer sheath is made of PE (polyethylene), a durable and flexible thermoplastic material. PE offers excellent resistance to moisture, making it suitable for underground and wet environments. It is also resistant to UV radiation, ensuring that the sheath does not degrade when exposed to sunlight in outdoor installations. PE has good impact resistance, protecting the inner components of the cable from mechanical damage during installation and operation. Additionally, PE is resistant to many chemicals, including acids, alkalis, and hydrocarbons, making it suitable for industrial environments.
In terms of styles, the cables are available as 3-core cables, which is the standard for three-phase medium-voltage power systems. The three cores are twisted together to form a
Compact Cable, with fillers used to ensure a round and stable cross-section. The Ahxamk-W and Ahxamk-Wp are two distinct styles within this range. The Ahxamk-W likely features a standard PE sheath, suitable for general-purpose installations. The Ahxamk-Wp may have an enhanced PE sheath with additional properties, such as improved UV resistance (indicated by the "p" suffix) for outdoor overhead installations, or flame retardancy for use in areas where fire safety is critical. Some variants may also include an armor layer (though not mentioned in the base specifications) for additional mechanical protection in harsh environments, such as direct burial in rocky soil or areas with high rodent activity.
1.4 Production Process
The production of the 12/20kV 3-core aluminum conductor medium voltage cables involves several precise steps to ensure their quality and performance.
The first step is the manufacturing of the aluminum conductors. High-purity aluminum ingots are melted and cast into rods. These rods are then drawn through a series of dies to reduce their diameter and form thin
Aluminum Wires. The wires are then stranded together using a stranding machine. The stranding process is done in a specific pattern (such as concentric or bunch stranding) to ensure that the conductor has the desired flexibility and current-carrying capacity. The
Stranded Conductors are annealed to soften them, improving their ductility and flexibility.
Next, the XLPE insulation is applied to each conductor. The insulation is extruded onto the conductors using a high-pressure extrusion machine. The XLPE compound is melted and forced through a die that shapes it around the conductor, forming a uniform insulation layer. The thickness of the insulation is carefully controlled during extrusion to meet the specified requirements. After extrusion, the
Insulated Conductors undergo a cross-linking process. This can be done using either chemical cross-linking or radiation cross-linking. In chemical cross-linking, the insulated conductors are heated in a vulcanization tube at a temperature of around 200-250°C, which causes the cross-linking agents in the XLPE to react and form a three-dimensional molecular structure. In radiation cross-linking, the conductors are exposed to electron beams, which initiate the cross-linking process without the need for high temperatures. Cross-linking enhances the thermal and mechanical properties of the XLPE insulation.
Once the insulated conductors are cooled, the XLPE screen layer is applied. This is done by extruding a semi-conductive XLPE compound over the insulation layer. The screen layer is applied in a continuous process, ensuring intimate contact with the insulation to prevent any air gaps that could lead to partial discharges.
The three insulated and screened conductors are then twisted together to form a 3-core cable core. This twisting process is done using a cabling machine, which ensures that the conductors are evenly spaced and twisted at a specific pitch. Fillers, typically made of PE or jute, are added between the conductors to fill any gaps and maintain a round cross-section. A binder tape (made of polyester or similar material) is wrapped around the twisted core to hold the conductors and fillers together.
The final step is the extrusion of the PE outer sheath. The cable core is passed through an extrusion machine, where molten PE is extruded around it to form the outer sheath. The thickness of the sheath is controlled to meet the specified requirements. The extruded cable is then cooled in a water bath to solidify the PE sheath.
After production, the cables undergo a series of rigorous tests. Electrical tests include insulation resistance testing, voltage withstand testing (both AC and impulse), and partial discharge testing. Mechanical tests, such as tensile strength and elongation tests on the sheath and insulation, are also conducted. Additionally, the cables are checked for dimensional accuracy, including conductor size, insulation thickness, and overall diameter. Only after passing all these tests are the cables labeled with their respective designations (Ahxamk-W or Ahxamk-Wp) and prepared for distribution.
2. General Product Information
2.1 Packaging
The packaging of the 12/20kV 3-core aluminum conductor medium voltage cables is designed to protect them during storage, transportation, and handling, ensuring they reach their destination in optimal condition.
The cables are typically spooled onto large steel reels due to their weight and size. The reels have flanges with diameters ranging from 1.2 meters to 3.0 meters, depending on the cable length and size. For example, a 50mm² cable with a length of 500 meters may be spooled onto a reel with 1.5-meter flanges, while a 400mm² cable with a length of 300 meters may require a reel with 2.5-meter flanges. The reels are constructed from heavy-gauge steel to withstand the weight of the cable, which can be several tons.
Each reel is labeled with detailed information, including the cable type (Ahxamk-W or Ahxamk-Wp), conductor size, number of cores, voltage rating, length of the cable on the reel, batch number, production date, and compliance with relevant standards (such as IEC). This information helps customers identify the correct cable for their specific applications.
The cable ends are sealed with heat-shrinkable caps to prevent moisture, dust, and debris from entering the cable core. This is particularly important for preserving the insulation properties of the XLPE, as any contamination could compromise its performance. The reels are wrapped with a layer of waterproof plastic film to provide additional protection against moisture, which is crucial for outdoor storage.
For transportation, the reels are secured to wooden or steel pallets using steel straps. The pallets ensure that the reels can be easily moved using forklifts or cranes. For international shipments, the reels are often placed in wooden crates that meet ISPM 15 standards, which require heat treatment to prevent the spread of pests. This ensures compliance with international phytosanitary regulations and avoids delays in customs clearance.
2.2 Transportation
Transporting the 12/20kV 3-core aluminum conductor medium voltage cables requires careful planning to ensure they arrive at their destination in good condition, considering their size, weight, and sensitivity to damage.
For domestic transportation, heavy-duty trucks with flatbed or curtain-sided trailers are used. The reels are loaded onto the trailers using cranes or forklifts equipped with appropriate lifting equipment. The reels are positioned to distribute the weight evenly across the trailer, preventing overloading of any single axle. They are secured to the trailer using steel chains or straps, which are tightened around the reels and anchored to the trailer's bed. Wooden blocks or chocks are placed between the reels to prevent them from rolling or shifting during transit, even during sudden stops or turns.
For long-distance or international transportation, sea freight is the most common and cost-effective option. The reels are loaded into shipping containers, which are either 20-foot or 40-foot high-cube containers to accommodate the large reel sizes. The reels are secured inside the containers using dunnage bags, which are inflated to fill the gaps between the reels and the container walls, preventing movement during the voyage. Steel braces may also be used to further secure the reels, especially for larger and heavier ones.
Air freight is rarely used for these cables due to their weight and size, but it may be considered for urgent, small-volume shipments. In such cases, the cables are cut into shorter lengths and packaged in lightweight crates to meet airline weight restrictions.
During transportation, the cables must be protected from extreme temperatures. High temperatures can cause the PE sheath to soften, while low temperatures can make it brittle. Therefore, transportation vehicles or containers should be covered or insulated if necessary, especially when transporting through regions with extreme climate conditions. Additionally, the cables should be protected from direct sunlight for extended periods to prevent UV degradation of the PE sheath.
2.3 Delivery
The delivery process of the 12/20kV 3-core aluminum conductor medium voltage cables is designed to be efficient and reliable, ensuring that customers receive their orders on time and in good condition.
When a customer places an order, the supplier processes it and checks the availability of the requested cable type, size, and length. If the cables are in stock, they are prepared for delivery within 2-3 business days. For custom orders (e.g., specific lengths or special variants like Ahxamk-Wp), the delivery time may be longer, typically 2-4 weeks, depending on the production schedule.
The supplier works with reputable logistics companies that specialize in the transportation of heavy and oversized cargo. The customer is provided with a detailed delivery schedule, including the estimated pickup date from the supplier's warehouse and the expected delivery date at the customer's location.
Once the shipment is dispatched, the customer is given a tracking number, which allows them to monitor the progress of the delivery online. The tracking information includes details such as the current location of the shipment, the carrier's name, and any updates or delays.
Upon delivery, the customer is required to inspect the reels for any visible damage. This includes checking for dents or cracks in the reels, damage to the cable sheath, and intactness of the heat-shrinkable caps on the cable ends. If any damage is found, it should be documented and reported to the supplier and the logistics company immediately. The supplier will then work with the customer to resolve the issue, which may involve replacing the damaged cables or arranging for repairs.
2.4 Samples
Suppliers of the 12/20kV 3-core aluminum conductor medium voltage cables often provide samples to customers to allow them to evaluate the product before placing large orders.
Samples are typically short lengths of the cable, ranging from 1 to 5 meters, depending on the customer's request. They include all the key features of the full-length cables, such as the aluminum conductors, XLPE insulation, XLPE screen, and PE sheath, as well as the specific designation (Ahxamk-W or Ahxamk-Wp). This allows customers to conduct physical and electrical tests to verify the cable’s quality, such as measuring conductor size, insulation thickness, and checking for continuity.
To request a sample, customers can contact the supplier’s sales team via email, phone, or through the company’s online portal. They need to specify the cable type (Ahxamk-W or Ahxamk-Wp), conductor size, and desired length. Some suppliers may charge a nominal fee for the sample, which is often refunded if the customer places a subsequent order exceeding a certain quantity.
Samples are shipped using express courier services to ensure timely delivery. Domestic samples typically arrive within 3–5 business days, while international samples may take 7–10 business days. The samples are packaged in rigid cardboard tubes or wooden crates to protect them from damage during transit.
2.5 After-sales Service
Comprehensive after-sales service is provided to ensure customer satisfaction and address any issues related to the 12/20kV 3-core aluminum conductor medium voltage cables.
Technical support is a key component of after-sales service. Suppliers offer guidance on cable installation, termination, and maintenance through a team of experienced engineers. This includes providing detailed installation manuals, recommending appropriate tools and accessories (such as cable lugs and joint kits), and offering on-site consultation for complex projects. For example, if a customer is installing the cable in a high-moisture underground environment, engineers can advise on proper sealing techniques to prevent water ingress.
Warranty coverage is provided for manufacturing defects. The standard warranty period is typically 10–15 years, depending on the supplier and cable variant. The warranty covers issues such as insulation breakdown due to material flaws or improper extrusion, and conductor defects affecting current-carrying capacity. To claim warranty, customers must provide proof of purchase and a detailed report of the issue, including photographs or test results. Suppliers may send technical personnel to inspect the faulty cable and determine the cause of the problem.
In case of cable failure outside the warranty period, suppliers offer repair and replacement services. This includes supplying replacement sections of cable, joint kits, or termination accessories, along with technical assistance to ensure proper installation. For large-scale projects, suppliers may also offer periodic maintenance checks to assess cable performance, identify potential issues (such as corrosion or insulation degradation), and recommend preventive measures.
Feedback mechanisms are in place to continuously improve product quality. Suppliers encourage customers to share their experiences, both positive and negative, through surveys or direct communication. This feedback is used to refine manufacturing processes, address design flaws, and enhance customer service. For example, if multiple customers report issues with the PE sheath’s UV resistance in tropical climates, the supplier may modify the sheath formulation to improve durability.
Training programs are also available for customers’ technical staff. These programs cover topics such as cable handling, installation best practices, and troubleshooting common issues. Training can be conducted on-site, at the supplier’s facility, or through virtual workshops, ensuring that customers have the knowledge to maximize the cable’s lifespan and performance.
In summary, the after-sales service for these medium voltage cables is designed to support customers throughout the cable’s lifecycle, from installation to end-of-service, ensuring reliable operation and minimizing downtime in power distribution systems.
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