High-reliability 10kV YJV22 cable for critical power distribution projects

The YJV22 8.7/15kV is a mainstream 10kV medium-voltage power cable, covering the entire application range of power systems from 6kV to 10kV. It uses high-purity compacted copper conductors, cross-linked polyethylene (XLPE) main insulation, a multi-layer semi-conductive shielding system, a PVC inner sheath, double-layer hot-dip galvanized steel tape armor, and a high-performance modified PVC outer sheath. With a rated voltage of 8.7/15kV and a maximum system voltage of 17.5kV, it is specifically designed for 50Hz AC medium-voltage transmission and distribution networks.

Unlike aluminum-core medium-voltage cables and special fire-resistant cables, this copper-core YJV22 series cable is positioned for projects prioritizing long-term operational stability, high load capacity, excellent dielectric properties, and comprehensive mechanical protection. Its integrated shielding and insulation structure effectively suppresses partial discharge, a key indicator for medium-voltage cables. With its mature manufacturing process, complete set of accessories, and wide environmental adaptability, this product has become the preferred standard model for power grid companies, large industrial enterprises, key municipal projects, and commercial complex power systems. It is widely used in direct burial, cable trench, utility tunnel, and cable tray installations under various complex geological and site conditions.

Each layer is precisely designed to adapt to medium-voltage operating characteristics and harsh laying environments:

• Copper Conductor: Made of tightly stranded high-purity electrolytic copper, it has low resistivity and excellent mechanical strength and thermal stability. It maintains stable conductivity even under long-term rated load and short-term surge current, preventing loose terminal connections or overheating.
• Conductor Semiconductor Shielding Layer: Utilizing an extruded, uniform semiconducting compound, it ensures a uniform electric field distribution on the conductor surface, eliminating localized electric field concentration and fundamentally reducing the risk of partial discharge.
• XLPE Insulation Layer: Made of thickened, high-density cross-linked polyethylene, it is the core functional layer of medium-voltage insulation. It possesses ultra-high dielectric strength, low dielectric loss, and excellent heat aging resistance, ensuring stable insulation performance for decades.
• Insulating Semiconductor Shielding Layer: A co-extruded semiconducting layer tightly bonded to the insulation layer and metal shielding layer, forming a continuous shielding system to prevent insulation breakdown under medium voltage.
• Copper tape metal shielding layer: Overlapping copper tape windings withstand induced current and fault current, achieving reliable electromagnetic shielding and system grounding, complying with medium-voltage power distribution safety specifications.
• Inner sheath: Rigid PVC protective layer, isolating the internal insulation and shielding components from the external armor, buffering friction, and preventing moisture and dust intrusion.
• Steel tape armor: Double-layer hot-dip galvanized steel tape, forming a full-circle rigid protective layer. During installation and operation, it resists compression, impact, tension, and rock friction; the galvanizing treatment provides excellent rust resistance in damp soil.
• Outer sheath: Reinforced modified PVC compound, enhancing weather resistance, abrasion resistance, and slight chemical corrosion resistance, protecting the entire cable from outdoor environmental and soil corrosion.

• Rated Voltage: 8.7/15kV (Uo/U), Applicable System Range: 6kV～10kV, Maximum System Voltage Um = 17.5kV, Power Frequency: 50Hz
• Conductor Long-Term Allowable Operating Temperature: ≤ 90°C
• Maximum Short-Circuit Withstand Temperature: 250°C, Maximum Duration: 5 seconds
• Conductor Cross-sectional Area Range: 35mm²～630mm²
• Standard Core Configuration: 3 cores (main specification for 10kV three-phase systems); Single cores can be provided according to customized project requirements
• Minimum Bending Radius: Static fixed laying ≥ 15 × cable outer diameter; Temporary moving and pulling laying ≥ 20 × cable outer diameter
• Allowable Laying Ambient Temperature: ≥ 0°C
• Operating Ambient Temperature Range: -20°C ~ +70°C
• Power frequency withstand voltage: 39kV, no breakdown for 15 minutes
• Lightning impulse withstand voltage: 112kV (peak), no flashover or breakdown
• Partial discharge level: Extremely low partial discharge at rated voltage, providing core protection for long-term operation of medium-voltage cables
• Waterproof performance: Integrated fully sealed structure, suitable for long-term laying environments such as damp underground, trenches, and public tunnels
• Flame retardant performance: Standard type available; flame retardant and fire-resistant types can be customized according to project requirements.
  

All products are manufactured, inspected, and tested in strict accordance with the national standard GB/T 12706 for medium-voltage cables, and fully comply with the international standards IEC 60502 and IEC 60228. All test reports and certification documents are recognized by domestic power grid, industrial, and municipal engineering acceptance departments.

Classified by project type, power supply level, and laying conditions, this guide addresses the actual selection needs of electrical engineers and procurement teams:

1. Urban and Rural Medium-Voltage Power Grids
   • Suitable for 10kV main lines, branch lines, and ring network lines in new urban areas, old city renovations, and rural power grid upgrades.
   • Suitable for incoming and outgoing lines of urban substations, prefabricated substations, and ring network units.
   • Laying methods: direct burial, cable trench, integrated pipe tunnel; this is the most widespread application area for this series of cables.
2. Large Industrial Parks and Heavy Industrial Enterprises
   • Suitable for 10kV main power supply lines connecting enterprise main substations and workshop distribution rooms; suitable for industries such as machinery manufacturing, metallurgy, building materials, chemicals, and textiles.
   • Suitable for power supply lines for high-power production equipment, central control rooms, and auxiliary facilities within industrial parks.
   • Adaptable to on-site equipment vibration, industrial dust, general humidity, and complex backfill soil conditions.
3. Key Municipal Infrastructure and Public Utilities
   • Medium-voltage power distribution lines for water plants, sewage treatment plants, waste disposal centers, and urban pumping stations
   • Support power lines for large transportation hubs, municipal road projects, and bridge projects
   • Suitable for projects with strict acceptance standards and complete documentation requirements
4. Large Commercial Complexes and High-Rise Building Complexes
   • 10kV main incoming lines for super high-rise buildings, large shopping malls, exhibition centers, and integrated office parks
   • Medium-voltage power supply for building central air conditioning, fire protection systems, and large electrical equipment
   • Note: For fully enclosed, high-density public areas, flame-retardant upgraded specifications are recommended.
5. New Energy and Distributed Power Projects
   • Transmission lines for centralized photovoltaic power stations, wind power generation facilities, and energy storage power stations.
   • Outdoor buried and tunnel laying for new energy projects, requiring adaptation to long-term outdoor sunlight, rain, and temperature variations.
6. Special Laying and Harsh Working Conditions
   • Direct laying in gravelly soil, roadbeds, and fill containing sharp objects.
   • Long-distance laying in mountainous areas, slope laying, and pipeline crossing projects.
   • Dense laying in large cable trenches and multi-layer cable trays in centralized power distribution areas.

1. Excellent Dielectric Properties and Ultra-Low Partial Discharge

   The matched triple shielding structure, coupled with high-purity cross-linked polyethylene (XLPE) insulation, achieves a uniform internal electric field. The partial discharge index is far below the national standard limit, which is a core advantage of medium-voltage cables. This effectively avoids insulation aging and breakdown caused by long-term partial discharge, greatly extending the cable's service life at 10kV operating voltage.

2. Excellent Conductivity and Strong Overload Capacity

   High-purity copper conductors possess low resistivity and stable thermal properties. Compared to aluminum conductor medium-voltage cables with the same cross-sectional area, they have a greater current-carrying capacity and lower temperature rise. They can stably handle peak loads and short-term overloads in industrial production and power grid operation, ensuring the continuity and efficiency of power transmission.

3. Multi-layer Shielded Grounding Safety System

   The copper strip metal shielding layer works in conjunction with the inner and outer shielding layers to form a complete electromagnetic isolation system. This system can reliably conduct fault currents and induced currents, reduce electromagnetic interference to surrounding equipment and lines, and fully meet the grounding design requirements of medium-voltage power distribution systems.

4. Enhanced Mechanical Protection for Harsh Buried Environments

   Double-layer galvanized steel strip armor provides comprehensive mechanical protection. It can withstand continuous soil pressure, friction from sharp stones, external impacts, and construction traction. The galvanized layer effectively prevents the steel strip from rusting and degrading in the humid underground environment, minimizing cable damage rates during construction and long-term operation.

5. Comprehensive Environmental Adaptability

   The reinforced PVC outer sheath boasts excellent weather resistance, aging resistance, and abrasion resistance. It can operate stably in various weather conditions, including high and low temperatures, rain and snow, throughout the year, and exhibits a certain degree of tolerance to weak acids, weak alkalis, and common soil components. It can adapt to most climates and geological environments in different regions.

6. Low Lifecycle Failure Rate and Reduced O&M Costs

   The scientific material combination and mature structural design ensure stable cable performance during long-term operation. Copper conductors are less prone to connection overheating and poor contact. Combined with high-performance insulation materials, the overall failure rate is extremely low. Project owners only need to conduct regular routine inspections, significantly reducing the manpower and financial investment in later O&M.

7. Wide Compatibility and Convenient On-Site Construction

   As a universal standard 10kV cable, it is fully compatible with mainstream medium-voltage cable terminals, joints, grounding accessories, and construction tools on the market. The standardized structural design and moderate flexibility facilitate cable laying in cable trenches, tunnels, and vertical shafts, helping construction teams improve overall work efficiency.

   

1. Design and Specification Selection Principles
   • Voltage Matching: This product is designed for 6kV～10kV (rated voltage 8.7/15kV) medium-voltage AC systems. To avoid insulation safety risks, it is strictly prohibited for use at voltage levels of 20kV and above.
   • Cross-sectional Area Calculation: The conductor cross-sectional area should be strictly selected based on the load current, transmission distance, short-circuit current, and laying method. For long-distance trunk lines, the cross-sectional area should be appropriately increased to control voltage drop and temperature rise.
   • Laying Density Derating: When multiple medium-voltage cables are densely laid in cable trays or deeply buried in high-temperature soil, the actual allowable current carrying capacity should be reduced and sufficient heat dissipation gaps should be reserved.
   • Environmental Classification: For coastal salt spray areas, chemically corrosive workshops, and fireproof confined spaces, corrosion-resistant or flame-retardant customized versions should be selected instead of standard products.
2. On-site Laying and Construction Specifications
   • Construction Temperature: Laying work must not be carried out when the ambient temperature is below 0℃ to prevent brittle fracture and permanent damage to the cross-linked polyethylene (XLPE) insulation layer and polyvinyl chloride (PVC) sheath.
   • Bending Radius Control: This medium-voltage large-size cable has high rigidity and must be laid strictly according to the specified minimum bending radius. Sharp bends, twists, and severe compression are prohibited to avoid shielding layer misalignment and insulation layer damage.
   • Tightening Force Management: Use professional medium-voltage cable pulling equipment to maintain uniform traction force. Excessive traction force can lead to conductor breakage, armor deformation, and interlayer separation.
   • Direct Burial Standard: Lay a 100mm thick layer of fine sand on both sides of the cable and cover it with a concrete protective slab to isolate sharp gravel and hard objects.
   • Terminal and Grounding Treatment: Use dedicated medium-voltage copper cable terminals and perform standardized crimping, sealing, and stress relief treatment. Ensure that both ends of the copper tape shielding layer and steel tape armor layer are reliably grounded according to power industry standards.
3. Procurement, Acceptance, and Warehousing Management
   • Document Verification: During the procurement process, check complete qualification certificates, routine factory test reports, type test reports, and partial discharge test reports. Verify that all documents comply with national and industry standards for medium-voltage engineering.
   • Visual Inspection: Inspect the cable surface for cracks, scratches, uneven outer diameter, and unclear printing markings; confirm that the model, rated voltage, and cross-sectional area are consistent.
   • Sampling Inspection: For large orders and key projects, organize third-party random sampling and conduct power frequency withstand voltage, partial discharge, and insulation resistance tests according to acceptance regulations.
   • Storage Requirements: Place cables on professional large cable reels and store them in a dry, ventilated, and cool warehouse. Keep away from open flames, chemical solvents, and standing water. Prolonged open-air storage and direct sunlight are prohibited.
   • Inventory Planning: Arrange deliveries in batches according to the construction schedule. Avoid long-term static storage of medium-voltage cables to prevent sheath aging and structural deformation.

1. Case 1: Urban 10kV Power Grid Upgrade Project

   A prefecture-level city launched an upgrade project for its aging underground medium-voltage power grid, using YJV22 8.7/15kV-3×400mm² cables to lay 22km of underground trunk lines. The construction area covered urban roads and mixed soil backfill areas. The steel tape armor effectively resisted vehicle vibration and gravel friction. After 8 years of operation, partial discharge and insulation indicators remained normal, and no power outages occurred due to cable damage. The project department highly praised its long-term stability.

2. Case 2: Large Heavy Machinery Industrial Park Project

   A 700,000-square-meter heavy machinery industrial park used this cable as the connection line between the main substation and various workshops. The park is equipped with numerous high-power machinery and equipment, which are subject to long-term vibration and industrial dust. The copper conductor stably carries high current, and the comprehensive shielding system avoids electromagnetic interference to precision equipment. These cables have been in continuous operation for 7 years, demonstrating excellent overall performance.

1. High-Quality Raw Materials and Strict Full-Process Quality Control

   We use high-purity electrolytic copper and imported high-quality XLPE insulation materials. Equipped with fully automated production lines and online partial discharge monitoring equipment, we conduct multiple inspection processes throughout the entire production process, from raw material warehousing to finished product delivery. Each roll of medium voltage cable undergoes rigorous full-piece inspection before delivery to ensure consistent quality across batches.

2. Complete Standard Specifications and Stable Batch Supply

   We offer standard 3-core products, covering all mainstream cross-sectional areas from 35mm² to 630mm². Sufficient inventory of popular specifications is available to meet the spot supply needs of urgent projects. We possess large-scale continuous production capacity, capable of meeting the material requirements of large-scale power grids and long-cycle industrial projects.

3. Diverse Customization and One-Stop Supporting Services

   We provide customized services such as fixed-length cutting, special surface marking, flame retardant, fire-resistant, and anti-corrosion treatments based on project design and site environment. In addition, we also provide matching medium-voltage terminals, cable connectors, grounding components and laying auxiliary materials to enable buyers to make one-stop purchases.

4. Professional Full-Cycle Technical Support

   Our team of medium-voltage power engineering engineers provides free pre-sales services, including load calculation, voltage drop analysis, laying scheme optimization, and model selection advice. During construction, we provide remote guidance and on-site technical support to solve problems related to cable laying, terminal production, and grounding installation.

5. Standardized Packaging and On-Time Delivery Guarantee

   All medium-voltage cables are packaged in export-grade reinforced wooden rolls to prevent damage during long-distance transportation. For large orders and phased projects, we develop customized production and delivery plans to ensure timely material delivery and avoid construction interruptions.

6. Complete Official Documentation for Smooth Acceptance

   We can provide a complete set of official documents, including qualification certificates, routine factory test reports, type test reports, partial discharge test reports, and standards compliance declarations. All documents meet the requirements for power grid, industrial, and municipal bidding and acceptance, saving the purchaser significant document preparation work.

7. Long-Term Reliable After-Sales Service System

   We establish dedicated project files for key large orders. The after-sales team regularly tracks the product's operational status throughout its lifespan, responds efficiently to technical inquiries and feedback, and provides comprehensive after-sales support for engineering projects.