Direct Burial Medium Voltage Cable for Port & Urban Core Grid Projects
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Описание продукта
The YJV22 8.7/15kV 3×185mm² is a mainstream medium-cross-section three-core medium-voltage cable, specifically designed for AC 50Hz three-phase power systems with a rated voltage of 8.7/15kV. It falls between traditional small-cross-section cables and heavy-duty large-cross-section cables, balancing current carrying capacity, laying flexibility, and cost-effectiveness, making it an ideal choice for medium-load power transmission and ring network distribution.
Manufactured according to IEC 60502-2, IEC 60228, and GB/T 12706 standards, this cable employs mature co-extruded shielding and double steel tape armoring technology, integrating excellent electrical performance, mechanical protection, and environmental adaptability. It is widely used in urban power ring networks, medium and large-scale industrial parks, water conservancy facilities, and logistics hubs, making it an economical mainstream product for 15kV medium-voltage power distribution projects.
Full-Layer Structure:
- Compacted oxygen-free copper conductor
- Extruded inner semi-conductive shielding layer
- Standard medium-voltage cross-linked polyethylene insulation
- Extruded outer semi-conductive shielding layer
- PVC padding layer
- Double-layer hot-dip galvanized steel tape armor
- Weather-resistant PVC outer sheath
3×185mm² Class 2 Compacted Copper Conductor: Utilizes multi-strand stranded, high-purity oxygen-free copper, tightly compacted to effectively reduce conductor resistance and internal gaps, ensuring stable current transmission and moderate heat generation during continuous operation.
Double-Layer Integrated Semi-Conductive Shielding: Employs an integrated co-extrusion process to eliminate air gaps between the conductor and insulation layer, uniformly distributing the electric field under a 15kV operating voltage, effectively suppressing partial discharge.
Standard Medium-Voltage Cross-Linked Polyethylene (XLPE) Insulation: Specifically formulated for 8.7/15kV voltage levels, possessing excellent dielectric strength and long-term thermal stability, adaptable to frequent load fluctuations in power distribution networks.
Double-layer galvanized steel tape armor: Standard winding density and thickness provide reliable resistance to compression, impact, and biting, fully meeting the protection requirements for direct burial and cable trench installations.
Inner liner and outer sheath combination: Isolates the armor from the insulation layer to prevent friction damage. The outer sheath is waterproof, anti-aging, and UV resistant, suitable for complex outdoor and underground environments.
| Parameter Category | Detailed Technical Index |
|---|---|
| Rated operating voltage (Uo/U) | 8.7/15 kV, 50Hz AC |
| Cable model & structure | YJV22, 3 cores × 185 mm² copper conductor |
| Conductor specification | Stranded & compacted high-purity oxygen-free copper (Class 2) |
| Insulation material | Medium voltage grade cross-linked polyethylene (XLPE) |
| Shielding structure | Inner & outer fully extruded semiconductive dual shielding |
| Armoring layer | Double layers of hot-dip galvanized steel tape |
| Outer sheath material | Weather-resistant modified PVC |
| Maximum continuous working temperature | 90 °C |
| Short-circuit withstand temperature (≤5s) | 250 °C |
| Allowable emergency operating temperature | 130 °C |
| Minimum laying ambient temperature | 0 °C |
| Minimum static bending radius | 14 × overall cable diameter |
| Minimum dynamic bending radius | 19 × overall cable diameter |
| Power frequency withstand voltage | 30.5 kV, lasts 5 minutes without breakdown |
| Partial discharge value | ≤ 5 pC under rated operating voltage |
| Waterproof performance | Class A, suitable for long-term direct burial |
| Environmental resistance | Resist weak acid, weak alkali, soil electrolyte and UV radiation |
| Optional customized types | Flame retardant, fire-resistant, low smoke zero halogen, anti-termite, fixed length |
| Design service life | 40 years under standard operating conditions |
| Reference continuous current carrying capacity | Approx. 370A (buried depth 0.7m, standard soil thermal resistance) |
This product utilizes a moderate cross-sectional size, combining balanced performance, economy, and adaptability, offering significant advantages compared to other specifications:
The 185mm² conductor achieves a perfect balance between current carrying capacity and cable size. It can stably carry medium to large concentrated loads and features low DC resistance, thereby reducing power attenuation during transmission. Compared to smaller cross-section cables, it provides sufficient margin for load expansion; compared to excessively large cross-section cables, it avoids resource waste and additional construction costs.
Matched cross-linked polyethylene (XLPE) insulation and a double-layer shielding system optimize the electric field distribution. Even in ring network operation with frequent power switching and load changes, partial discharge remains within standard ranges. This prevents insulation aging and leakage, ensuring long-term stable operation of the distribution circuit.
The standard double-layer steel tape armor resists daily external impacts, ground pressure, and accidental excavation at the construction site. At the same time, the cable maintains good flexibility, making it easier to bend and lay than large-section cables. It is compatible with cable trenches, duct corridors, direct burial, and various other installation methods, making it suitable for complex site installation designs.
XLPE material maintains stable physical and electrical properties even after long-term operation at 90°C. The outer sheath incorporates anti-aging additives to cope with seasonal temperature changes, outdoor sunlight exposure, and damp soil conditions. It maintains stable performance in temperate and subtropical regions.
The multi-layered sealing structure effectively prevents groundwater and humid air from penetrating the cable core. The sheath material is resistant to common soil electrolytes and corrosive gases from light industry, allowing reliable operation in suburban soils, general industrial areas, and humid waterfront environments.
We offer a variety of optional versions to meet different project specifications. Flame-retardant versions inhibit the spread of flames along the cable; fire-resistant versions ensure power supply to critical loads during fires; low-smoke halogen-free versions reduce smoke and toxic gas emissions, meeting fire protection requirements for public utilities and enclosed conduit corridors.
All dimensions conform to international standards and are compatible with mainstream 15kV cable terminals, joints, supports, and fittings worldwide, requiring no special accessories. As a mainstream medium-section model, its supporting materials are mature, resulting in lower overall project procurement costs.
This specification is mainly applicable to 15kV medium-load distribution systems and ring network projects, covering industries such as civil engineering, industrial production, water conservancy, and logistics:
Used for urban 15kV ring network trunk lines, substation feeder lines, and distribution lines in large residential areas and commercial complexes. Its reliable performance and moderate load capacity are fully adapted to the power supply mode of urban interconnected power grids.
Used as power trunk lines and loops in integrated industrial parks, machine processing plants, food factories, and light chemical plants. It can power multiple production lines and medium-power equipment, adapting to daily load fluctuations and dusty workshop environments.
Suitable for 15kV power supply to water intake pumping stations, drainage stations, and water conservancy hubs. Adaptable to high humidity environments and frequent pump start-stop operations, ensuring continuous operation of the water supply system.
Suitable for power distribution in large logistics parks, freight yards, and highway service areas. The underground installation method conforms to the overall planning of the logistics site, and mechanical protection prevents damage caused by vehicle movement and on-site construction.
Suitable for auxiliary power circuits and distribution room connection lines in thermal power plants, hydropower stations, and new energy power plants. Works in conjunction with the main power equipment to complete the internal power distribution of the power station.
Suitable for the upgrading, renovation, and expansion of urban and rural 15kV power grids. It balances performance and cost, and is suitable for large-scale underground installations and distributed load characteristics in rural areas.
This guide outlines key design, construction, testing, and operation points for on-site engineers to standardize project implementation:
Direct burial, cable trench, and integrated utility tunnel laying methods are preferred; short-distance overhead laying requires fixed supports. Steel pipes should be used for reinforcement when crossing roads, ditches, and foundation areas. Standard cable clamps should be used to secure cables and prevent sheath wear caused by their own weight.
Confirm the system's rated voltage is 8.7/15kV before design. Calculate the actual operating current based on the total equipment power, and reserve a 15%~20% margin to accommodate future load expansion. Avoid long-term overload operation to prevent accelerated insulation degradation.
During pulling and laying, the specified minimum bending radius should be followed; excessive bending will damage the shielding and insulation layers. For direct burial cabling, fine sand should be laid at the top and bottom of the cable, and protective bricks should be laid as needed. Construction should be stopped when the ambient temperature is below 0°C to prevent the cable sheath from cracking.
In humid areas and general industrial zones, use standard waterproof cable accessories and fully seal all joints. Centralize all joints in well-ventilated and easily accessible locations for subsequent routine inspections and maintenance.
Perform power frequency withstand voltage tests and partial discharge tests before energizing to confirm insulation integrity. For ring network lines, conduct regular insulation resistance tests and visual inspections, and promptly eliminate potential risks.
For project bidding, bulk procurement, and export trade, focus on certification, quality stability, and documentation support:
Our products strictly adhere to IEC and GB/T series standards and hold internationally recognized certifications such as CE and ISO. All indicators have passed third-party testing, meeting the bidding and supply requirements for medium-voltage engineering projects in various regions.
- Raw Material Incoming Inspection: Copper rods, XLPE granules, steel strips, and sheath materials are sampled and tested one by one before warehousing, and unqualified raw materials are rejected.
- Online Real-Time Monitoring: Automated production lines track insulation thickness, shielding uniformity, and outer diameter in real time, ensuring the consistency of each cable structure.
- Comprehensive Finished Product Inspection: Conductor resistance, withstand voltage, partial discharge, and mechanical properties are 100% tested, and complete test records are maintained to ensure traceability.
We provide factory inspection reports, qualification certificates, detailed test data sheets, English installation guidelines, and construction drawings. All documents meet the requirements for project filing, bid review, on-site acceptance, and export customs clearance.
Utilizing standardized production processes and mature technologies, product performance and parameters are highly consistent across different batches, enabling it to adapt to phased construction, multi-batch delivery, and long-term framework procurement for large-scale projects.
A prefecture-level city launched a 15kV urban power grid ring network renovation project, procuring 25,000 meters of YJV22 8.7/15kV 3×185mm² cable to construct an interconnected distribution loop. All cables were laid using direct burial and cable trench methods. After 7 years of operation, the line operated stably without any partial discharge anomalies or mechanical failures, effectively improving the reliability of urban power supply and successfully passing power grid acceptance.
A modern industrial park in a certain region selected this cable as the 15kV main distribution line within the park, connecting the central distribution room with multiple production workshops. The cable maintained stable operation for 24 hours even under the combined effects of workshop dust and intermittent impact loads. After the project was delivered, it operated well, and the customer subsequently placed multiple orders for the cable for the expansion of the park.
- 10.1 Superior Raw Materials and Reliable Overall Quality
We use high-purity oxygen-free copper and premium medium-voltage cross-linked polyethylene (XLPE) materials. Our comprehensive quality management system ensures stable product performance. High-quality cables reduce line faults and subsequent maintenance costs, creating long-term value for engineering projects. - 10.2 Diverse Customization and One-Stop Accessory Supply
Based on standard products, we support customized needs such as flame retardancy, fire resistance, low smoke halogen-free, termite resistance, and fixed cutting lengths. We also provide matching 15kV cable terminals, connectors, and installation accessories, enabling one-stop procurement and simplifying the procurement process. - 10.3 Professional Technical Team and Customized Pre-sales Service
Our medium-voltage electrical engineers provide free services, including load calculation, cable type selection, and laying scheme optimization. We can prepare relevant technical documents and certification materials for bidding projects, helping clients save time on technical preparation. - 10.4 Ample Inventory and Flexible Global Delivery
We maintain ample inventory of this mainstream specification to support large spot orders and urgent project needs. It can be mixed with other cable products to optimize container space and control logistics costs. For long-term clients, we offer frame supply to ensure stable delivery. - 10.5 Complete Export Documentation and Smooth Customs Clearance
We are familiar with international trade rules and customs requirements of various regions. We can provide a complete set of certification documents, test reports, and trade documents required for export, ensuring smooth customs clearance and on-time delivery. - 10.6 Comprehensive After-Sales Service and Remote Technical Guidance
Each order comes with a standard English operation and installation manual. For large-scale projects, we provide free remote technical guidance during construction. Our service team responds quickly to technical inquiries to ensure smooth project progress.
