1. Product-Specific Information
1.1 Specification Parameters
The 15kV 350 Mcm/175mm² shield cable with 133% BIL and XLPE insulation is a meticulously engineered medium-voltage power transmission solution, designed to meet the rigorous demands of modern electrical infrastructure. Its core specifications are tailored to ensure optimal performance, safety, and reliability in a wide range of applications.
The conductor size is specified in both imperial and metric units, with 350 thousand circular mils (Mcm) corresponding to 175 square millimeters (mm²). This dual specification allows for seamless integration into projects following either standard, making it a versatile choice for international applications. The conductor, made from high-purity electrolytic copper, boasts a conductivity of approximately 58 MS/m at 20°C, ensuring minimal resistive losses during power transmission. This high conductivity translates to efficient energy transfer, which is crucial for reducing operational costs in large-scale power distribution systems.
The rated voltage of 15kV indicates that the cable is designed to operate safely at a phase-to-phase voltage of 15kV and a phase-to-ground voltage of 8.7kV, placing it firmly in the medium-voltage category. This makes it suitable for applications such as primary distribution lines, industrial power feeders, and renewable energy interconnections. The 133% Basic Impulse Level (BIL) is a key performance indicator, meaning the cable can withstand an impulse voltage of approximately 170kV for a 1.2/50µs full-wave lightning impulse. This exceeds the minimum requirements set by international standards like IEC 60502, providing an extra layer of protection against transient overvoltages caused by lightning strikes or switching operations.
The XLPE insulation layer has a thickness ranging from 4.5mm to 5.5mm, depending on the specific application requirements. This insulation exhibits a dielectric strength of 20-30 kV/mm, ensuring effective isolation of the conductor from the external environment and preventing electrical breakdown. The insulation is designed to operate continuously at a maximum conductor temperature of 90°C, with short-term overload capabilities up to 130°C for durations of up to 5 seconds. This thermal resilience allows the cable to handle temporary current spikes, such as those caused by motor starting or fault conditions, without compromising its integrity.
The shielding layer, typically composed of copper tape or
Copper Wires, has a thickness of 0.1-0.3mm for copper tape or a total cross-sectional area of 10-15mm² for copper wires. This shielding provides a low-impedance path for fault currents, ensuring that any electrical faults are quickly detected and isolated by protective devices. The outer sheath, made from either PVC or PE, has a thickness of 2.5-3.5mm, offering robust mechanical protection against abrasion, impact, and environmental factors.
The overall diameter of the cable ranges from 48mm to 55mm, depending on the specific configuration (e.g., type of shielding and sheath material). This dimension is optimized to balance ampacity (current-carrying capacity) with ease of installation, ensuring that the cable can fit into standard conduits and cable trays. The weight per meter of the cable is approximately 6.5-7.5kg, which influences handling requirements but remains manageable with
Standard Cable-laying equipment.
The minimum bending radius of the cable is 12 times its outer diameter for fixed installations and 20 times for flexing applications. This
Flexibility allows for easy routing around obstacles during installation, reducing the need for additional joints and minimizing potential points of failure.
1.2 Special Features and Applications
The 15kV 350 Mcm/175mm² shield cable offers a range of special features that make it highly suitable for diverse applications across various industries.
One of its primary features is the use of XLPE insulation, which provides numerous advantages over traditional
Insulation Materials. XLPE has excellent thermal stability, allowing it to operate at higher temperatures without degradation, which increases the cable's current-carrying capacity. It also has low dielectric loss, ensuring efficient power transmission with minimal energy dissipation. Additionally, XLPE is resistant to moisture, chemicals, and UV radiation, making it suitable for both indoor and outdoor installations in harsh environments.
The shielding layer is another critical feature, designed to contain the electric field within the cable and prevent electromagnetic interference (EMI) with nearby equipment. This is particularly important in industrial settings, where sensitive electronic devices and control systems could be affected by EMI. The shielding also helps to evenly distribute the electric field around the conductor, reducing the risk of partial discharges that can cause insulation breakdown over time.
The 133% BIL rating provides enhanced protection against transient overvoltages, making the cable ideal for use in regions prone to lightning activity or in systems with frequent switching operations. This feature is especially valuable in renewable energy projects, such as wind farms and solar parks, where equipment is often exposed to the elements and lightning strikes are a significant risk.
In terms of applications, the cable is widely used in urban power distribution networks. Its 15kV rating and high current-carrying capacity make it suitable for primary distribution lines, connecting substations to industrial areas, commercial districts, and large residential complexes. The dual unit specification (350 Mcm/175mm²) allows for easy integration into existing infrastructure, whether it follows imperial or metric standards.
Industrial facilities, such as manufacturing plants, refineries, and chemical processing plants, also benefit from the cable's robust construction. Its resistance to chemicals, moisture, and high temperatures ensures reliable performance in harsh industrial environments, where downtime can be costly. The cable is often used to power large machinery, motors, and other high-load equipment.
Renewable energy projects are another key application area. In wind farms, the cable is used to collect power from individual turbines and transmit it to the main substation. Its high BIL rating and weather resistance make it suitable for outdoor installations, withstanding the harsh conditions typically found in wind farm locations. In solar parks, the cable is used to connect solar panels to inverters and grid connection points, ensuring efficient power transmission from the generation source to the grid.
The cable is also suitable for use in infrastructure projects, such as airports, seaports, and railways. These applications require reliable power transmission to support critical operations, and the cable's durability and performance make it an ideal choice. For example, in airports, the cable can be used to power runway lighting, terminal buildings, and air traffic control systems.
1.3 Material Selection and Styles
The materials used in the 15kV 350 Mcm/175mm² shield cable are carefully selected to ensure optimal performance, durability, and safety.
The conductor is made from high-purity electrolytic copper (99.9% pure), which is chosen for its excellent electrical conductivity and mechanical properties. Copper has a higher conductivity than aluminum, reducing resistive losses and improving energy efficiency. It is also highly ductile, allowing for easy stranding and bending during installation. The
Copper Conductors are stranded using a class 2 stranding pattern, which consists of multiple layers of copper wires twisted together. This stranding enhances flexibility, making the cable easier to handle and install, while also improving heat dissipation by increasing the surface area of the conductor.
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 process is typically achieved using 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 break molecular bonds, initiating cross-linking without the need for chemical additives. Both methods result in XLPE with excellent thermal stability,
Chemical Resistance, and mechanical strength, making it far superior to non-cross-linked polyethylene, which softens at high temperatures.
The shielding layer is made from high-conductivity copper, either in the form of tape or wires. Copper
Tape Shielding consists of a thin strip of copper helically wrapped around the insulation with a 15-25% overlap to ensure electrical continuity. Copper wire shielding uses multiple fine copper wires stranded together and applied longitudinally or helically around the insulation. Both types of shielding provide effective EMI protection and a low-impedance path for fault currents.
The outer sheath is available in two materials: polyvinyl chloride (PVC) and polyethylene (PE).
PVC Sheaths offer excellent mechanical strength, abrasion resistance, and flame retardancy, making them suitable for indoor installations and areas where fire safety is a priority. PE sheaths, on the other hand, provide superior moisture resistance and flexibility, making them ideal for outdoor and underground installations. Both materials are resistant to UV radiation, ensuring long-term performance in exposed environments.
The cable is available in two main styles: armoured and non-armoured.
Armoured Cables feature an additional layer of galvanized
Steel Tape or wire between the shielding and the outer sheath, providing enhanced mechanical protection against impact, crushing, and rodent damage. This makes them suitable for direct burial in rocky soil or installation in areas with high mechanical stress. Non-
Armoured Cables are lighter and more flexible, making them easier to install in conduits, cable trays, or other protected environments.
1.4 Manufacturing Process
The manufacturing process of the 15kV 350 Mcm/175mm² shield cable involves several precise steps, each carefully controlled to ensure quality and consistency.
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. These strands are then stranded together using a stranding machine, which twists them in a specific pattern to form the conductor core. The stranding process is monitored to ensure that the lay length (the distance over which a strand completes one full twist) is consistent, as this affects the conductor's flexibility and current-carrying capacity.
Next, the conductor is passed through an extrusion line to apply a semi-conductive layer. This layer is designed to ensure a smooth transition between the conductor and the insulation, reducing electric field stress at the interface. The semi-conductive material is a mixture of polyethylene and carbon black, which is heated to a molten state and applied using a cross-head die that centers the conductor within the extrusion, ensuring even coverage.
The XLPE insulation is then extruded over the semi-conductive layer. The XLPE compound, which may contain peroxides for chemical cross-linking, is fed into an extruder where it is melted and mixed. The molten XLPE is extruded through a precision cross-head die, which ensures a uniform insulation thickness. After extrusion, the cable undergoes cross-linking. For chemical cross-linking, the cable is passed through a vulcanization tube where it is heated to 200-250°C, causing the peroxides to decompose and form cross-links. For radiation cross-linking, the cable is exposed to a beam of high-energy electrons, which initiate cross-linking without the need for heat.
Once the insulation is cross-linked, the cable moves to the shielding application stage. For
Copper Tape Shielding, a wrapping machine applies the copper tape helically around the insulation with the required overlap. The tape is bonded to the insulation using heat or adhesive to ensure good electrical contact. For copper wire shielding, multiple wires are stranded together and applied longitudinally or helically around the insulation, with the ends connected to ensure continuity.
The final step is the extrusion of the outer sheath. The PVC or PE compound is melted in an extruder and extruded over the shielding layer, forming a continuous, uniform jacket. The sheath is cooled in a water bath to solidify it, and the cable is then wound onto reels for storage and transportation.
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 batch are also subjected to long-term aging tests to ensure that the cable meets performance requirements over its intended service life.
2. General Product Information
2.1 Packaging
The 15kV 350 Mcm/175mm² shield cable is packaged to ensure maximum protection during storage, transportation, and handling. The cable is wound onto sturdy wooden or steel reels, which are designed to support the weight of the cable and prevent damage during unwinding.
The reels have flanges at both ends to contain the cable, with diameters ranging from 1000mm to 1600mm depending on the length of the cable. For example, a 500m length of cable is typically wound onto a 1200mm reel, while a 1000m length requires a 1600mm reel. The reels are constructed from high-quality materials to withstand the rigors of transportation, with reinforced flanges to prevent bending or breaking.
The cable is secured to the reel using steel strapping, which is tightened at regular intervals to prevent movement 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 stored outdoors or in humid environments, as it prevents the sheath from degrading and the insulation from absorbing moisture.
Each reel is labeled with detailed information, including the cable type, conductor size (both 350 Mcm and 175mm²), voltage rating, BIL rating, length, batch number, manufacturing date, and compliance with relevant standards (such as IEC 60502 or ASTM D1248). This information allows for easy identification and traceability of the cable. Additionally, handling instructions are printed on the reel, including the maximum lifting weight, proper lifting points, and warnings against dropping or mishandling the reel.
For smaller lengths (e.g., 50m to 100m), the cable may be packaged in coils wrapped in plastic film, with labels similar to those on the reels. These coils are designed for easy transportation and handling on construction sites where large reels may be impractical.
2.2 Transportation
Transporting the 15kV 350 Mcm/175mm² shield cable requires careful planning to ensure that the cable and reels are not damaged during transit. The reels are typically transported by truck, train, or container ship, depending on the destination.
For road transportation, the reels are loaded onto flatbed trucks and secured using chains or straps to prevent movement. 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, preventing the truck from becoming unbalanced.
When transporting by train, the reels are loaded into railcars and secured using similar methods to those used for truck transportation. Rail transportation is often preferred for long-distance shipments, as it is more cost-effective and less prone to delays caused by traffic congestion.
For international shipments, the reels are loaded into 20ft or 40ft shipping containers. The containers are selected based on the size and number of reels, ensuring that there is enough space to secure them properly. The reels are secured to the container floor using twist locks or steel straps, and the container is ventilated to prevent moisture buildup. For shipments to regions with high humidity or salt exposure (e.g., coastal areas), the reels may be treated with anti-corrosion coatings to protect against rust and degradation.
During transportation, the cable must be protected from extreme temperatures. In hot climates, the cable should be shaded to prevent the sheath from softening, while in cold climates, it should be protected from freezing, which can make the sheath brittle. 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 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.
2.3 Shipment and Delivery
The shipment and delivery process for the 15kV 350 Mcm/175mm² shield cable is designed to ensure that the cable reaches the customer in a timely and efficient manner.
Once an order is placed, the cable is either manufactured to specification or retrieved from inventory. The cable is then wound onto reels, packaged, and prepared for shipment. The customer is provided with a packing list and a bill of lading, which includes details such as the number of reels, total length of cable, weight, and destination.
The delivery time depends on the customer's location and the mode of transportation. For domestic shipments, delivery typically takes 3 to 7 business days for truck transportation and 5 to 10 business days for rail transportation. For international shipments, delivery can take 2 to 4 weeks, depending on the destination and customs clearance procedures.
Customers are provided with a tracking number to monitor the progress of their shipment online. This allows them to plan for the arrival of the cable and ensure that the necessary equipment and personnel are available for unloading.
Upon delivery, the customer is required to inspect the shipment for damage. If any damage is found, it must be reported to the shipping company and the manufacturer within 48 hours of delivery. The manufacturer will work with the customer to resolve any issues, which may include replacing damaged cable or arranging for repairs.
For large orders, the manufacturer may offer partial shipments, where the cable is delivered in multiple batches to meet the customer's project timeline. This is particularly useful for construction projects, where cable is needed at different stages of the project.
2.4 Samples
The manufacturer provides samples of the 15kV 350 Mcm/175mm² shield cable to customers for testing and evaluation before placing a full order. Samples typically consist of 1m to 5m lengths of cable, including all layers (conductor, semi-conductive layer, XLPE insulation, shielding, and outer sheath).
The samples are packaged in protective boxes to prevent damage during transportation. Each sample is labeled with the same information as the full reels, including the cable type, conductor size, voltage rating, BIL rating, and batch number. This allows customers to trace the sample back to the production batch, ensuring that the sample is representative of the full order.
Customers can conduct a range of tests on the samples to verify compliance with their specific requirements. These tests may include measuring conductor resistance to ensure it meets the specified conductivity standards, checking insulation thickness and uniformity to confirm proper dielectric protection, and assessing the shielding’s continuity to guarantee effective EMI mitigation. Additionally, customers often perform dielectric strength tests to validate the insulation’s ability to withstand high voltages without breakdown, as well as flame resistance tests on the outer sheath to ensure it meets safety codes for their intended application.
The manufacturer can also provide certified test reports for the samples, conducted in accordance with international standards such as IEC 60502 or ASTM. These reports include detailed results of mechanical, electrical, and thermal performance tests, offering customers independent verification of the cable’s quality. Sample requests can be submitted through the manufacturer’s sales team or online portal, with typical delivery times ranging from 5 to 10 business days, depending on the customer’s location. While a nominal fee may apply for sample preparation and shipping, this cost is often waived or refunded upon placement of a full order, encouraging customers to thoroughly evaluate the product before committing to large-scale purchases.
2.5 After-Sales Service
The manufacturer’s commitment to customer satisfaction extends beyond delivery, with a comprehensive after-sales service program designed to support the 15kV 350 Mcm/175mm² shield cable throughout its lifecycle.
Technical support is a cornerstone of this program, provided by a team of experienced engineers specializing in
Power Cable systems. Customers can access support via phone, email, or video conferencing to address questions related to installation, termination, jointing, or maintenance. For example, if a customer encounters challenges in properly terminating the cable to a switchgear or transformer, the technical team can provide step-by-step guidance, including recommended tools, torque specifications, and sealing techniques to ensure a reliable connection. In complex cases, on-site technical visits may be arranged, where engineers work directly with the customer’s installation team to resolve issues and optimize performance.
Warranty coverage is another key component, with the cable backed by a 10-year warranty from the date of delivery. This warranty covers defects in materials and workmanship, ensuring that any cable failing to meet performance standards due to manufacturing issues is either repaired or replaced at no additional cost. To file a warranty claim, customers must provide proof of purchase, a detailed description of the issue, and, when possible, photographs or test reports documenting the defect. The manufacturer’s quality assurance team then conducts an investigation, which may include testing samples from the affected batch, to determine the cause of the issue and approve the appropriate remedy.
For cases where damage occurs due to improper installation, accidental mishandling, or environmental factors not covered by the standard warranty, the manufacturer offers repair and replacement services at competitive rates. This includes services such as cable splicing, where damaged sections are cut out and replaced with new cable using industry-approved jointing kits, ensuring the repaired cable maintains its electrical and mechanical integrity. The manufacturer’s service technicians are trained to perform these repairs in accordance with international standards, minimizing downtime and restoring the cable to full functionality.
Ongoing maintenance support is also provided to help customers maximize the cable’s service life. This includes recommendations for periodic testing schedules, such as insulation resistance testing every 2-3 years to detect moisture ingress or insulation degradation, and partial discharge testing to identify early signs of insulation breakdown. The manufacturer can arrange for certified third-party testing laboratories to perform these tests, providing customers with unbiased performance data. Additionally, the manufacturer offers training programs for customer personnel on cable handling, installation best practices, and maintenance procedures, empowering customers to proactively manage their cable systems and prevent avoidable failures.
Feedback mechanisms are integrated into the after-sales program to continuously improve products and services. Customer feedback is collected through surveys, follow-up calls, and on-site visits, with a dedicated team analyzing comments to identify areas for enhancement. This customer-centric approach ensures that the manufacturer remains responsive to evolving market needs, whether through modifying cable designs to improve durability or expanding service offerings to address emerging challenges in power transmission.
In summary, the 15kV 350 Mcm/175mm² shield cable (133% XLPE Insulated BIL Cable) combines advanced engineering, high-quality materials, and rigorous manufacturing processes to deliver a reliable medium-voltage power transmission solution. Its dual unit specification, enhanced BIL rating, and versatile design make it suitable for a wide range of applications, from urban distribution networks to renewable energy projects. Supported by robust packaging, efficient transportation, flexible shipment options, comprehensive sampling, and dedicated after-sales service, the cable provides customers with a complete solution that ensures performance, safety, and peace of mind throughout its operational lifecycle.
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