ZR-YJV22-8.7/15kV 3×185mm² Cable: Comprehensive Details
1. Product Specifications and Core Attributes
The ZR-YJV22-8.7/15kV 3×185mm² cable is a specialized low-voltage power transmission solution engineered to deliver exceptional performance in demanding environments. Its design integrates advanced materials and precision engineering to meet the highest standards of safety, durability, and efficiency.
1.1 Electrical and Physical Specifications
At the heart of this cable’s functionality are its precise electrical ratings. The 8.7/15kV voltage rating indicates it is designed to operate with a maximum phase-to-neutral voltage of 8.7kV and a phase-to-phase voltage of 15kV, making it suitable for low-voltage distribution networks that require reliable power transmission over medium to long distances. The 3-core configuration, each with a cross-sectional area of 185mm², ensures balanced current distribution in three-phase power systems, a critical feature for industrial machinery, large commercial complexes, and infrastructure projects.
The conductor’s 185mm² size enables it to handle high current loads, typically up to 400A under standard installation conditions. This current-carrying capacity is determined by factors such as ambient temperature, installation method (e.g., underground vs. air), and thermal dissipation, ensuring the cable remains within safe operating temperatures even during peak demand. The
Copper Conductors, with a conductivity of ≥98% IACS (International Annealed Copper Standard), minimize power loss, ensuring efficient energy transmission and reducing operational costs over the cable’s lifespan.
Physically, the cable’s dimensions are optimized for both performance and installation
Flexibility. The overall diameter, including insulation, inner sheath, and
Steel Tape armoring, typically ranges from 60mm to 70mm, depending on manufacturing tolerances. This compact profile allows for easier routing through conduits, trenches, and cable trays, even in space-constrained environments. The cable’s weight, approximately 5.5kg per meter, balances robustness with manageability, facilitating handling during installation without compromising structural integrity.
1.2 Material Composition and Structural Design
The ZR-YJV22-8.7/15kV 3×185mm² cable’s performance is directly attributed to its high-quality material composition and layered structural design.
Copper Conductors: The conductors are made from high-purity electrolytic copper, ensuring superior electrical conductivity. The copper is stranded—composed of multiple thin wires twisted together—to enhance flexibility, allowing the cable to bend around obstacles during installation without cracking or breaking. Stranding also improves heat dissipation by increasing the surface area, preventing overheating during high-current operation.
XLPE Insulation: Each conductor is insulated with cross-linked polyethylene (XLPE), denoted by the "Y" in the cable designation. XLPE is chosen for its exceptional thermal stability, enabling continuous operation at 90°C and short-term overloads up to 130°C. This insulation is resistant to chemicals, moisture, and UV radiation, making it suitable for both indoor and outdoor applications. Unlike traditional PVC Insulation, XLPE does not soften or degrade at high temperatures, ensuring long-term electrical performance and reducing the risk of insulation breakdown.
Inner Sheath (PVC): A polyvinyl chloride (PVC) inner sheath, indicated by "V," surrounds the Insulated Conductors. This sheath binds the cores together, providing mechanical protection against abrasion and preventing moisture ingress. The PVC is formulated to be flame-retardant, aligning with the "ZR" (flame-retardant) classification, and acts as a barrier between the insulation and the outer armoring.
Steel Tape Armoring: The "22" in the designation refers to the double steel tape armoring, a defining feature of this cable. Two layers of galvanized steel tape are helically wrapped around the inner sheath, overlapping to form a continuous protective barrier. This armoring provides exceptional resistance to mechanical damage, including crushing from heavy loads (e.g., vehicles passing over Underground Cables), impact from tools or machinery, and gnawing by rodents or termites. The galvanized coating on the steel tape prevents corrosion, ensuring durability in humid or corrosive environments.
Outer Sheath (PVC): An outer PVC Sheath encases the steel armoring, providing additional protection against moisture, chemicals, and UV radiation. This sheath is also flame-retardant, enhancing the cable’s fire safety properties. It is colored black for UV resistance, making it suitable for outdoor installations where direct sunlight exposure is common.
1.3 Flame-Retardant Properties
The "ZR" classification is a critical safety feature, ensuring the cable resists combustion and slows fire spread. The flame-retardant properties are integrated into both the inner and outer PVC sheaths, which are formulated with additives (e.g., aluminum trihydrate) that release water vapor when exposed to high temperatures, cooling the material and inhibiting combustion.
The cable undergoes rigorous flame tests, such as the IEC 60332-3 standard, which measures flame propagation along the cable. In these tests, the cable is exposed to a controlled flame for a specified duration; a flame-retardant cable will self-extinguish within a set time after the flame is removed, preventing the fire from spreading through the cable route. This feature is vital in high-risk environments such as power plants, hospitals, and data centers, where a fire could disrupt critical services and endanger lives.
2. Specialized Applications
The ZR-YJV22-8.7/15kV 3×185mm² cable’s unique combination of features makes it ideal for a range of demanding applications, where safety, durability, and reliability are paramount.
2.1 Industrial Facilities
Industrial environments, such as manufacturing plants, refineries, and chemical factories, require cables that can withstand harsh conditions. The steel tape armoring protects against damage from heavy machinery, while the flame-retardant sheaths reduce fire risks in areas with flammable materials. The cable’s high current-carrying capacity makes it suitable for powering large motors, furnaces, and production lines, ensuring uninterrupted operation of critical equipment.
In petrochemical facilities, the cable’s
Chemical Resistance (from XLPE insulation and PVC sheaths) prevents degradation from exposure to oils, solvents, and corrosive gases. Its ability to operate at high temperatures also makes it suitable for use near heat sources, such as boilers or furnaces.
2.2 Commercial and Infrastructure Projects
Large commercial complexes, including shopping malls, airports, and high-rise buildings, rely on this cable for their main power distribution. The 3-core configuration supports three-phase power systems, which are essential for powering elevators, air conditioning systems, and lighting grids. The flame-retardant properties comply with strict building codes, ensuring safety in high-occupancy spaces.
In infrastructure projects, such as urban subway systems, bridges, and tunnels, the cable’s steel armoring provides protection against physical damage during construction and operation. Its resistance to moisture makes it suitable for underground installations in damp environments, such as subway tunnels or flood-prone areas.
2.3 Renewable Energy Installations
Renewable energy projects, including wind farms and solar parks, require cables that can handle high currents and withstand outdoor conditions. The ZR-YJV22-8.7/15kV 3×185mm² cable is used to connect renewable energy generators to the grid, as its XLPE insulation and PVC sheaths resist UV radiation and moisture, ensuring longevity in outdoor settings. The high current capacity accommodates the variable output of wind turbines and solar panels, while the steel armoring protects against damage from wildlife or harsh weather.
2.4 Power Distribution Networks
Electric utility companies use this cable for low-voltage distribution, connecting substations to industrial and commercial customers. Its ability to be installed underground or in
Overhead Cable trays makes it versatile for urban and rural networks. The flame-retardant and armored design minimizes the risk of outages caused by fire or physical damage, ensuring reliable power supply to communities.
3. Production Process
The manufacturing of the ZR-YJV22-8.7/15kV 3×185mm² cable involves a series of precision steps, each designed to ensure quality and consistency.
3.1 Conductor Manufacturing
The process begins with copper rod preparation. High-purity copper rods (99.95% purity) are drawn through a series of dies to reduce their diameter, forming thin wires. These wires are then stranded using a stranding machine, which twists them together in a specific pattern to enhance flexibility. The stranding process is computer-controlled to ensure uniform tension and lay length, preventing uneven stress distribution that could weaken the conductor.
After stranding, the conductors undergo annealing—a heat treatment process where they are heated to approximately 400°C and slowly cooled. Annealing softens the copper, improving its ductility and conductivity, ensuring the conductors can withstand bending during installation without cracking.
3.2 Insulation Extrusion
Each
Stranded Copper Conductor is insulated with XLPE using an extrusion process. The conductor is fed through an extruder, where molten XLPE is applied to its surface in a continuous, uniform layer. The thickness of the insulation is precisely controlled (typically 4mm to 6mm for this cable size) to meet electrical performance standards.
After extrusion, the XLPE insulation is cross-linked using either chemical or radiation methods. Chemical cross-linking involves adding a cross-linking agent to the XLPE before extrusion, which reacts when heated, forming strong chemical bonds. Radiation cross-linking uses electron beams to create cross-links, resulting in a more uniform structure. Cross-linking transforms the XLPE from a thermoplastic (melts when heated) to a thermoset (retains shape at high temperatures), enhancing its thermal and mechanical properties.
3.3 Core Assembly and Inner Sheath Application
The insulated conductors are then twisted together into a 3-core configuration using a cabling machine. This machine ensures the cores are twisted with a consistent lay length, preventing entanglement and ensuring uniform stress distribution. A binder tape is wrapped around the twisted cores to hold them together, providing structural stability.
Next, the inner PVC sheath is extruded over the bound cores. This process is similar to insulation extrusion, with molten PVC applied to form a continuous layer around the cores. The inner sheath’s thickness (typically 2mm to 3mm) is controlled to provide adequate protection without adding unnecessary bulk.
3.4 Steel Tape Armoring
The steel tape armoring is applied using an armoring machine, which feeds two layers of galvanized steel tape (each 0.3mm to 0.5mm thick) onto the cable. The tapes are wrapped helically around the inner sheath, with overlapping edges to form a seamless protective layer. The machine adjusts the tension and overlap to ensure uniform coverage, preventing gaps that could compromise protection.
3.5 Outer Sheath Extrusion
The final step is the application of the outer PVC sheath. Molten flame-retardant PVC is extruded over the steel armoring, forming a protective layer that seals the armoring and provides additional resistance to moisture and UV radiation. The outer sheath’s thickness (typically 2.5mm to 3.5mm) is controlled to ensure durability, and it is colored black using UV-stable pigments.
3.6 Quality Control and Testing
Quality control is integrated throughout the production process. Raw materials (copper, XLPE, PVC, steel tape) are inspected for purity, mechanical properties, and compliance with specifications. In-line sensors monitor insulation and sheath thickness, ensuring consistency.
After manufacturing, each cable undergoes rigorous testing:
Electrical tests: Insulation resistance (measured using a megohmmeter, minimum 1000MΩ at 20°C), dielectric strength (subjected to 30kV AC for 5 minutes without breakdown), and conductor resistance (to ensure compliance with conductivity standards).
Only cables that pass all tests are approved for shipment, with test reports generated for traceability.
4. Packaging
The ZR-YJV22-8.7/15kV 3×185mm² cable is packaged to ensure protection during storage, transportation, and handling.
4.1 Reel Packaging
Cables are typically wound onto wooden or steel reels, depending on the length and customer requirements. Standard reel sizes accommodate 250m, 500m, or 1000m lengths, with larger reels available for bulk orders.
Wooden reels: Made from treated plywood or hardwood, these reels are sturdy and cost-effective. They are heat-treated to comply with ISPM 15 standards, ensuring they are pest-free for international shipments.
Steel reels: Used for heavy-duty applications or long-length cables, steel reels offer superior strength and reusability. They are galvanized to resist corrosion, making them suitable for outdoor storage.
Reels are fitted with flanges (discs) at both ends to prevent the cable from unwinding during transportation. The flanges are reinforced with steel brackets to withstand handling by forklifts or cranes.
4.2 Labeling and Documentation
Each reel is labeled with essential information, including:
Accompanying documentation includes:
4.3 Additional Protection
For long-distance transportation or storage in harsh environments, reels are wrapped in heavy-duty plastic film to protect against moisture and dust. Wooden reels may be wrapped with metal bands to reinforce the flanges, preventing damage during loading and unloading.
5. Transportation and Shipping
The transportation of ZR-YJV22-8.7/15kV 3×185mm² cables requires careful planning to ensure they arrive in pristine condition.
5.1 Transportation Modes
Road transport: Used for domestic shipments, typically via flatbed trucks or enclosed trailers. Reels are secured with steel straps to prevent movement during transit, and soft padding is placed between reels to avoid scratches.
Sea transport: For international shipments, reels are loaded into shipping containers. They are secured to the container floor using twist locks or steel straps. Desiccants are placed in containers to absorb moisture, preventing condensation that could damage the cable.
5.2 Handling Guidelines
5.3 Shipping Documentation
International shipments include:
Tracking information is provided to customers, allowing them to monitor shipment progress.
6. Samples
Samples of the ZR-YJV22-8.7/15kV 3×185mm² cable are available to customers for evaluation, ensuring it meets their specific requirements.
6.1 Sample Provision
Customers can request 1m to 5m samples, which are cut from production batches and packaged in sealed plastic bags to prevent contamination. Samples include a datasheet with key specifications and test results.
6.2 Sample Testing
Samples are intended for:
6.3 Ordering Samples
Samples can be ordered via the manufacturer’s website, email, or sales representatives. They are shipped within 3-5 business days via express courier (e.g., DHL, FedEx). Sample costs are typically refundable if a bulk order is placed within 30 days.
After-Sales Service
The cable comes with a 10-year warranty, covering defects in materials and workmanship under normal operating conditions. The warranty does not cover damage from improper installation, misuse, or exposure to extreme conditions beyond the cable’s ratings.
Technical support is available via phone, email, or on-site visits. Engineers can assist with:
In the event of a warranty claim, customers must provide proof of purchase, batch number, and details of the issue. The manufacturer may arrange for testing of the defective cable, and replacements or refunds will be provided if the claim is valid.
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