Medium Voltage LSZH Double Steel Tape Armoured XLPE Cable | Underground Direct-Burial Anti-Puncture MV Cable for Industrial Incoming & Urban Grid Retrofit

WDZ-YJY23 is a medium-voltage, low-smoke, halogen-free, double-stainless steel-tape armored power cable with a rated voltage of 8.7/10kV. It features a compact copper conductor, XLPE high-voltage insulation, LSZH inner lining, double-layer overlapping galvanized steel tape armor, and an HDPE corrosion-resistant outer sheath, forming an integrated composite structure. Positioned as an economical, standard buried medium-voltage cable, it fills the application gap between the unarmored WDZ-YJY (limited to indoor/tray installation, without mechanical protection) and the round-wire armored WDZ-YJY33 (high tensile strength, suitable for high-investment applications such as road/river crossings).

Main structural forms: The mainstream specification is a three-core integral stranded structure, while a single-core structure can be customized for special transformer incoming line designs; widely used in urban power grid renovation, 10kV main incoming lines in industrial parks, outgoing trunk lines of distributed photovoltaic booster stations, and medium-voltage branch loops in municipal integrated utility tunnels.

• Rated U0/U Voltage: 8.7/10kV, compatible with conventional 10kV urban distribution network systems both domestically and internationally;
• Compact Copper Conductor Long-Term Permissible Continuous Operating Temperature: 90℃ under rated full-load stable operation;
• Instantaneous Short-Circuit Limit Temperature within 5-Second Short-Circuit Duration: 250℃;
• Factory Standard Power Frequency Withstand Voltage Test: 42kV, continuous for 15 minutes, no insulation breakdown;
• Lightning Impulse Withstand Voltage Test: Each batch of finished products passes the 75kV standard lightning impulse withstand voltage test;
• Partial Discharge Control: The partial discharge amplitude of the finished cable under rated operating voltage is lower than the specified threshold, effectively suppressing insulation hazards caused by long-term underground moisture and temperature changes.

• Conductor Standards: Class 2 tightly stranded high-purity electrolytic copper conductor conforming to IEC60228 and GB/T12706 standards. Tight stranding reduces internal air gaps and improves heat dissipation efficiency.
• Standard point cross-section range: 3×16mm²～3×400mm²; Custom sizes of 3×500/630mm² and non-standard single-core specifications can be made according to customer engineering drawings.
• DC resistance at 20℃ is strictly controlled below the standard upper limit, facilitating accurate calculation of current carrying capacity and voltage drop in long-distance buried lines by designers.

• Tightly Stranded Copper Conductor: Smooth stranded surface avoids localized electric field concentration, maintaining stable conductivity even after long-term underground moisture circulation;
• Thickened Medium-Voltage Cross-linked Polyethylene Insulation: Uniformly and continuously extruded and cross-linked, possessing excellent resistance to partial discharge, water treeing, and electrical aging, serving as a core guarantee for the safe operation of the 10kV system;
• Low-Smoke Halogen-Free Flame-Retardant Filler: Environmentally friendly filler fills the gaps between the insulated cores, giving the cable a rounded shape and improving overall flame-retardant performance under conditions of dense cable laying in conduit corridors;
• Low-Smoke Halogen-Free Inner Liner (Y): An integrally extruded buffer layer separates the insulated cores from the steel armor, eliminating the risk of the insulation layer being scratched during on-site bending and pipeline traction;
• Double-layer galvanized steel strip armor (23): Double-layer overlapping galvanized steel strip, possessing excellent resistance to compression, stone puncture, and rodent damage, suitable for underground soil environments;
• Modified high-density polyethylene outer sheath: Added with antibacterial agents and weak acid and alkali resistant additives, suitable for long-term buried use in ordinary urban soils and lightly polluted industrial soils.

• Minimum fixed laying ambient temperature ≥ 0℃; Low-temperature sheaths can be customized for mountainous areas below -20℃;
• Minimum installation bending radius ≥ 18 times the outer diameter of the finished cable;
• Standard applicable altitude ≤ 3000m; Low-pressure resistant insulation formulas can be customized for power projects in plateau mining areas above 3000m altitude.

• WDZ Low Smoke Halogen-Free Fire Safety Performance: Passes GB/T19666 and IEC60332 bundle flame retardant tests, with a smoke transmittance ≥70%, no corrosive halogen gas leakage, meeting the mandatory fire safety acceptance requirements for densely laid enclosed integrated pipe corridors;
• Double-Layer Steel Strip Armored Mechanical Protection: The double-layer overlapping steel strip structure allows for direct burial without auxiliary steel pipe protection, reducing engineering accessory costs, shortening the excavation and construction cycle, and preventing accidental cable damage during subsequent road expansion and municipal excavation;
• XLPE Excellent electrical stability due to superior insulation: Low dielectric loss and minimal capacitance variation under peak and off-peak load fluctuations, reducing energy loss in long-distance trunk lines;
• HDPE outer sheath provides corrosion and aging resistance: Compared to traditional PVC-sheathed YJV23 cables, it offers superior moisture resistance and soil erosion resistance, making it suitable for long-term operation in outdoor cable trenches and semi-underground damp environments;
• Cost-optimized structural design: Compared to round steel wire armored YJY33 cables, the flat steel tape armor has a smaller outer diameter and lower metal consumption, achieving a balance between mechanical protection and engineering investment, making it suitable for conventional buried medium-voltage projects without significant external impact;
• Long lifespan configuration: Utilizing a fully optimized LSZH+HDPE composite outer structure, it is designed for a service life of up to 30 years under standard buried conditions, reducing the owner's subsequent maintenance and replacement costs.

• Compared to traditional PVC YJV23, WDZ is a fully upgraded halogen-free product: Traditional YJV23 uses halogenated PVC linings and sheaths, which release toxic and corrosive fumes when burned; WDZ's full LSZH configuration meets the fire safety standards for green municipal utility tunnels and industrial parks.
• Compared to high-specification YJY33 round armor, WDZ has a cost advantage: YJY33 is mainly designed for applications with high tensile requirements, such as river crossings and road underpasses; WDZ-YJY23 avoids the over-configuration of traditional urban underground projects, effectively controlling bulk procurement budgets.
• Flexible Customized Production: Supports small-batch trial orders, custom production of irregular cross-sections and single cores, as well as mixed-package consolidation, reducing buyer inventory holdings.
• Full-Process Online Quality Inspection: The fully automated insulation extrusion production line is equipped with real-time insulation layer thickness and steel strip overlap monitoring equipment; each batch of finished products undergoes smoke and partial discharge sampling tests before delivery.

• 10kV Power Grid Renovation in Old Urban Areas: Upgrading of municipal power distribution trunk lines in city centers, direct burial in roadside green belts and centralized laying in newly built utility tunnels, subject to mandatory low-smoke halogen-free (LSZH) requirements from government green bidding;
• 10kV Main Incoming Lines in Integrated Industrial Parks: Incoming trunk lines of substations in light chemical, food manufacturing, and machinery processing parks, buried in lightly polluted soil in the surrounding area;
• Distributed Photovoltaic and Onshore Wind Power Substation Projects: 10kV outgoing trunk lines of substations, direct burial in wild soil on-site and laying in utility tunnels for control buildings;
• Urban Underground Integrated Utility Tunnel Construction: Medium-voltage distribution power cables in municipal integrated utility tunnels, densely laid in enclosed spaces, with strict fire prevention measures;
• County-level Urban-Rural Integrated Power Construction: New rural 10kV distribution network projects in suburban areas, direct burial in ordinary soil along roadsides.

• Direct Burial in Conventional Urban Soil: For non-corrosive urban soil, burial depth ≥1.0m, double-layer steel tape armor, no steel pipe required, saving construction costs;
• Dense Cable Layout in Utility Tunnels: All medium-voltage cables in utility tunnels must use WDZ-YJY23, not the halogen-containing YJV23, to ensure smooth acceptance by the fire department;
• Laying around Lightly Polluted Industrial Parks: For acidic and alkaline soils around chemical plants, use enhanced anti-corrosion customized sheaths to extend cable life;
• Budget-Controlled Municipal Bidding Projects: For conventional urban buried trunk lines, prioritize WDZ-YJY23, rather than the more expensive YJY33, to balance safety performance and total project investment.

• Raw Material Qualification Review: Before signing bulk contracts, suppliers must provide third-party inspection reports for low-smoke halogen-free compounds and electrolytic copper to exclude recycled inferior raw materials;
• Pre-shipment Third-Party Sampling Clause: A random sampling agreement should be included in the sales contract, allowing the buyer to designate a local authorized laboratory to test flame retardancy, partial discharge performance, and armor mechanical properties before container shipment;
• Pre-order parameter optimization consultation: Submit your project geological survey report and power design drawings to our medium-voltage technical team. Our engineers will optimize the cross-section selection based on the laying distance and soil conditions to avoid rework losses due to incorrect specifications.
• Delivery schedule coordination: Standard mainstream specifications are readily available from the factory, with fast delivery within 7-10 working days. For non-standard customized products, a fixed production cycle is confirmed during the pre-negotiation stage to coordinate with the overall project construction schedule.
• Export packaging optimization: Exported medium-voltage cables are packaged using thickened fumigated wooden trays + sealed moisture-proof film. The logistics department optimizes container layout to improve loading efficiency and reduce unit sea freight costs.

• Domestic Standards: GB/T12706 Medium Voltage Power Cable Standard, GB/T19666 Low Smoke Halogen-Free Flame Retardant Specification, GB/T2952 Armored Cable Manufacturing Standard;
• International Reference Standards: Developed according to the core clauses of IEC60840, IEC60332, and IEC61034, conforming to the electrical access specifications of major importing countries in Southeast Asia, the Middle East, Central Asia, and Africa;
• Complete Qualification Documents: CCC mandatory certification, fire protection product type approval certificate, CNAS accredited laboratory report, ISO9001 and ISO14001 certifications, and a complete set of English certification documents for overseas bidding;
• Customs Clearance Assistance Services: Assisting clients in applying for certificates of origin and related customs documents to shorten customs clearance time at the destination port.

• Professional Dedicated Medium-Voltage Technical Team: Equipped with medium-voltage cable design and geological application engineers, providing free pre-order cross-section matching consultation based on construction drawings and geological data, and offering remote on-site troubleshooting support;
• Full-Cycle Traceable Quality Management:Each cable reel has a unique batch tracking code, covering raw material incoming inspection, online production monitoring, and finished product sampling inspection, facilitating full-cycle quality traceability during project acceptance;
• Diverse International Trade Terms: Supports multiple settlement methods including FOB/CIF/CFR, with a dual cooperation plan of small trial orders and annual framework agreements. Long-term partners can enjoy tiered bulk purchase discounts;
• Stable Spot Inventory and Global Logistics Network: Maintains real-time factory inventory of standard specifications and collaborates with multiple international freight forwarders to develop cost-effective transportation solutions, avoiding delivery delays caused by port congestion;
• Flexible Production Capacity: Reserves a portion of medium-voltage production lines for strategic clients to quickly respond to urgent additional orders in the later stages of project construction.