Heavy-Duty YJLV22 MV Cable with Superior Mechanical Protection for Harsh Laying Conditions

The YJLV22 8.7/15kV is a classic 10kV medium-voltage steel-tape armored power cable, featuring a pure aluminum conductor, cross-linked polyethylene (XLPE) insulation, and a PVC outer sheath.

It has a rated voltage of 8.7/15kV and a maximum system voltage of 17.5kV. This product utilizes a mature multi-layer composite structure, integrating excellent electrical performance, robust mechanical protection, and broad environmental adaptability.

Unlike aluminum alloy and low-smoke halogen-free (LSZH) medium-voltage cables, the YJLV22 prioritizes operational stability, cost-effectiveness, and versatility. Designed specifically for conventional medium-voltage transmission and distribution networks, it employs standardized manufacturing processes, facilitating easy matching of accessories. Widely used in urban power grid upgrades, industrial substation grid connection, municipal infrastructure, and large-scale industrial projects, it has become the mainstream choice for electrical designers, engineering contractors, and bulk purchasers seeking a balance between quality and budget. It provides long-term stable performance in both conventional and moderately harsh installation environments.

• Conductor: Tightly stranded pure aluminum conductor, high conductivity, good ductility, uniform structure, facilitating terminal crimping and connection.
• Conductor Shielding Layer: Extruded semi-conductive shielding layer, optimizing internal electric field distribution and suppressing partial discharge.
• Insulation Layer: High-performance cross-linked polyethylene (XLPE), high dielectric strength, good heat resistance, strong aging resistance, and low dielectric loss under long-term load.
• Insulation Shielding Layer: Extruded semi-conductive layer, ensuring tight bonding with the insulation layer and metal shielding layer to avoid electric field concentration.
• Metal Shielding Layer: Copper strip overlapping winding, bearing fault current and electromagnetic shielding, ensuring grounding safety.
• Inner Sheath: PVC protective layer, isolating the internal core material from the armor layer, preventing friction damage and moisture penetration.
• Armor Layer: Hot-dip galvanized steel strip (type 22), with strong resistance to compression, impact, and tension, effectively resisting external mechanical forces.
• Outer Sheath: High-density PVC compound, wear-resistant, weather-resistant, and chemically resistant, protecting the entire cable from external environmental corrosion.

Rated Voltage:

8.7/15kV (Uo/U), Maximum System Voltage Um=17.5kV, Power Frequency 50Hz

Conductor Long-Term Allowable Operating Temperature:

≤ 90°C

Maximum Short-Circuit Withstand Temperature:

250°C (Duration ≤ 5 seconds)

Conductor Cross-sectional Area Range:

35mm² ~ 630mm²

Core Configuration:

Standard 3-core; Single-core can be customized according to special project requirements

Minimum Bending Radius:

Static Fixed Laying ≥ 12 × Cable outer diameter: Dynamic laying diameter ≥ 15 times the cable outer diameter

Permissible laying ambient temperature:

≥ 0℃

Applicable operating temperature range:

-20℃～+70℃

Power frequency withstand voltage:

39kV/15min, no breakdown

Lightning impulse withstand voltage:

112kV (peak)

Flame retardant performance:

Standard flame retardant grade, flame retardant enhanced grade can be customized upon request

Waterproof performance:

Integrated sealed structure, suitable for long-term laying in damp underground environments

2.3 Implementation Standards

Manufacturing and testing are strictly in accordance with national standards GB/T 12706 and GB/T 31840, and comply with relevant international specifications of the IEC 60502 series. All indicators meet the acceptance standards for domestic medium-voltage projects and general overseas supporting projects.

Categorized by project type, laying method, and operating environment, covering mainstream medium-voltage engineering scenarios, helping engineers and procurement personnel make accurate model selections:

• 10kV main lines, branch lines, and ring network lines for urban new districts, old city renovations, and rural power grid upgrades
• Incoming and outgoing lines of urban substations, prefabricated substations, and ring network units
• Direct burial, cable trench, and integrated utility tunnel laying for urban underground power grids

• Main distribution lines for heavy industry, light industry, machinery manufacturing, building materials, and textile factories
• Power connection lines between factory main substations and workshop distribution rooms
• Outdoor buried lines and cable tray laying in industrial areas, adaptable to equipment vibration, dust, and general humidity environments

• Medium-voltage power supply for water plants, sewage treatment plants, garbage disposal stations, and municipal pumping stations
• Reconstruction of power support lines for large-scale road projects, bridge projects, and municipal pipeline networks
• Power distribution for large scenic areas, urban integrated service facilities, and public utility stations

• 10kV incoming lines for large residential communities, commercial plazas, exhibition centers, and integrated service buildings
• Medium-voltage power trunk lines for large logistics parks, warehouse complexes, and transportation hubs

Note: For enclosed public buildings with high fire risk, it is recommended to use the flame-retardant upgraded version.

• Gathering and transmission lines for small and medium-sized photovoltaic power stations and wind power supporting projects
• Auxiliary medium-voltage circuits for surface facilities in mining areas and oil and gas fields
• Permanent power lines for large building bases and key temporary engineering projects

• Directly buried in ordinary soil, gravel layers, and roadbed backfill
• Layed in cable trenches, underground pipe corridors, and indoor/outdoor cable trays
• Layed on slopes and for short-distance overhead pipelines in hilly areas

The cross-linked polyethylene (XLPE) insulation layer possesses high dielectric strength and extremely low partial discharge levels, maintaining stable insulation performance over decades of continuous operation. The matched double semi-conductive shielding structure effectively homogenizes the electric field, significantly reducing the risk of insulation breakdown under medium-voltage operating conditions. The pure aluminum conductor provides stable conductivity and low operating temperature rise, ensuring safe and efficient power transmission in the 10kV system.

The galvanized steel tape armor forms a robust protective layer on the cable body. It can withstand continuous soil compression, rock friction, external impact, and construction traction. Even in complex geological conditions such as gravelly soil and backfill layers, the internal core structure is fully protected. The galvanizing treatment effectively inhibits corrosion of the steel tape in humid environments, thus maintaining long-term protective performance.

The high-density PVC outer sheath possesses excellent abrasion resistance, weather resistance, and chemical inertness. It resists natural corrosion from wind, rain, frost, and ultraviolet radiation, and is resistant to weak acids, weak alkalis, and common soil chemicals. It can operate stably in most temperate and subtropical regions and adapt to dusty, humid, and alternating wet and dry working environments.

Compared to copper-core medium-voltage armored cables, pure aluminum conductors significantly reduce raw material costs. The lightweight design reduces transportation, hoisting, and manual laying costs. Simultaneously, this product utilizes mature formulations and processes, resulting in a lower unit price than low-smoke halogen-free (LSZH) and aluminum alloy medium-voltage cables. For large-scale conventional medium-voltage projects, it effectively controls total investment without sacrificing basic operational performance.

As a classic 10kV cable model, it boasts standardized production processes and stable batch quality. The pure aluminum conductor is compatible with various conventional aluminum terminals and connectors, and its mature construction technology has been widely mastered by numerous construction teams. Its moderate flexibility allows it to adapt to various bends and wiring requirements, thereby improving overall construction efficiency.

The reliable material combination and structural design enable the product to have a design service life exceeding 40 years under standard operating conditions. The product exhibits a low failure rate during long-term operation, requiring only routine visual inspections. This effectively reduces the manpower and material resources needed for later maintenance by project owners.

• Voltage Matching: This product is designed for 8.7/15kV (10kV level) medium-voltage power systems and is not suitable for 20kV and above voltage levels.
• Cross-sectional Area Selection: The calculation of conductor cross-sectional area should strictly adhere to parameters such as load current, transmission distance, and short-circuit current. For long-distance transmission, the cross-sectional area should be appropriately increased to control voltage drop.
• Environmental Classification: For areas with severe salt spray, high corrosiveness, or high fire protection requirements, corrosion-resistant or flame-retardant upgraded models should be selected, rather than the standard model.
• Laying Method Tips: When directly burying conductors over long distances in high-temperature soil, the current carrying capacity should be appropriately reduced to avoid overheating.

• Construction Temperature: Laying work is prohibited when the ambient temperature is below 0℃ to prevent brittle cracking of the PVC sheath and XLPE insulation layer.
• Bending Control: Strictly adhere to the specified minimum bending radius. Avoid sharp bends, kinks, and severe compression to prevent damage to the internal shielding and insulation layers.
• Tightness Control: Apply even tension when laying cables. Excessive tension can cause conductor deformation, armor displacement, and interlayer separation.
• Direct Burial Standard: Lay a fine sand mat at the bottom and top of the cable, and cover it with a concrete slab or brick protective layer to isolate it from sharp objects.
• Terminal and Grounding Treatment: Use dedicated aluminum cable terminals for crimping. Ensure that both ends of the copper tape shielding layer and steel tape armor layer are reliably grounded according to electrical specifications.
• Wiring Spacing: When laying cables on cable trays or piers, sufficient ventilation gaps should be reserved to prevent heat accumulation under full load.

• Document Review: During the procurement process, verify product qualification certificates, factory routine test reports, type test reports, and parameter tables to ensure full compliance with national standards.
• Visual Inspection: Inspect the cable surface for cracks, scratches, and incomplete printing markings; confirm that the model, rated voltage, and cross-sectional area are consistent.
• Sampling Inspection: For large-volume orders, conduct random sampling according to project acceptance requirements to test power frequency withstand voltage, partial discharge, and sheath integrity.
• Storage Requirements: Store cables in a dry, ventilated, and cool warehouse using dedicated reels. Keep away from open flames, chemical solvents, and groundwater. Avoid long-term outdoor storage and direct sunlight.
• Inventory Turnover: Arrange procurement quantities reasonably according to the construction schedule to avoid long-term static storage, which may affect sheath performance.

A prefecture-level city undertook a large-scale upgrade of its aging underground medium-voltage power grid, using YJLV22 8.7/15kV-3×400mm² cables to lay 18km of underground main lines. The construction area consisted of roadside backfill and gravelly soil, with steel tape armor effectively resisting external compression and friction. After 7 years of operation, all lines operated stably without any major faults. Compared to copper core cables, the project team achieved nearly 32% cost savings, and its cost-effectiveness was highly recognized.

A 600,000-square-meter comprehensive industrial park used YJLV22 medium-voltage cables to connect the main substation and various workshops. The park experienced frequent equipment vibration and high levels of industrial dust. The cable's mechanical strength and environmental adaptability fully met the site conditions. Standardized accessories and a simplified construction structure also shortened the overall construction period by 10%.

A large wastewater treatment plant uses YJLV22 cables as its 10kV main transmission line. The plant operates year-round in a high-humidity environment. The cable's sealed structure and PVC sheath provide excellent moisture resistance. All certification documents have successfully passed the municipal engineering safety acceptance test, and the product has been operating stably for 5 years.

A rural integrated energy project includes a small-scale distributed photovoltaic power station and its supporting power grid. Both the photovoltaic transmission lines and the rural 10kV main power lines use YJLV22 8.7/15kV cables. This product is suitable for the complex geological conditions and all-weather outdoor environment in rural areas, is affordable, and meets the budget requirements for basic infrastructure construction. It has been widely adopted in several surrounding villages.

A large regional logistics hub uses YJLV22 medium-voltage armored cables as underground power lines. Frequent vehicle traffic and cargo loading and unloading place high demands on mechanical protection. The armored structure effectively prevents cable damage, and a stable power supply ensures the normal operation of warehousing, loading and unloading, and auxiliary facilities.

We use high-purity aluminum ingots and imported brand XLPE raw materials. Equipped with automated production and online monitoring equipment, we conduct multi-channel inspections throughout the entire production process, from raw material warehousing and semi-finished product processing to finished product delivery. Each roll of cable undergoes comprehensive electrical testing before delivery to ensure consistent and reliable quality in every batch.

We offer all standard cross-sections and mainstream three-core specifications. We can also provide customized services such as fixed-length cutting, special surface marking, and enhanced sheath formulations based on project design drawings and site conditions to meet different engineering needs.

Our senior electrical engineers provide free services, including load calculation, voltage drop analysis, and laying scheme optimization. During construction, we provide remote guidance and on-site technical support to engineers and construction teams to solve problems such as model matching, terminal production, and grounding installation.

Ample inventory is maintained for all popular standard specifications to support urgent orders and bulk spot shipments. For large-scale phased projects, we develop dedicated production plans and delivery schedules to ensure timely material delivery and avoid construction interruptions.

We provide a complete set of aluminum terminals, cable accessories, laying aids, and grounding components. Purchasers can complete one-stop sourcing, simplifying supplier management processes and reducing overall procurement costs.

We can provide a complete set of official documents, including type test reports, routine test reports, qualification certificates, and declarations of conformity. All documents meet bidding, filing, and project acceptance requirements, saving purchasers time on document preparation and review.

We establish dedicated project files for large orders. Our after-sales team continuously monitors product operation status, responds efficiently to technical inquiries and product feedback, and provides reliable service throughout the entire lifecycle of the cable.