Steel Tape Armoured MV XLPE Cable for Transformer Station & Industrial Medium Voltage Distribution

YJ:

Cross-linked polyethylene (XLPE) high-voltage insulation

V:

Extruded PVC inner sheath

22:

Double-layer overlapping galvanized steel strip armor + black weather-resistant PVC outer sheath

Rated voltage level:

U0/U = 8.7/15kV, suitable for 15kV medium-voltage three-phase power grids

Core configuration:

3×95mm² three-phase compacted copper core (no neutral wire, standard transformer trunk layout)

Class 2 T2 Compacted Oxygen-Free Copper Conductor (95mm² per core)

Made with tightly stranded high-density, high-purity copper wire, with DC resistance strictly controlled below the national standard upper limit. Low conductor resistance effectively suppresses voltage drop during medium-distance 15kV transmission. Tight stranding reduces the overall cable diameter, decreasing trenching workload and cable tray layout space for construction personnel. No recycled copper is added to the raw materials, ensuring stable continuous current carrying capacity.

Extruded Inner Semiconductor Shielding Layer

The uniformly co-extruded semiconductor layer is tightly bonded to the copper core surface, eliminating air gaps between the metal conductor and the main insulation layer. This results in a uniform internal electric field distribution, significantly reducing the risk of partial discharge under continuous 15kV operating voltage.

Thickened High-Purity Cross-Linked Polyethylene (XLPE) Main Insulation (15kV Dedicated Thickness)

Ultra-low dielectric loss cross-linked polyethylene compound insulation thickness specifically customized for 8.7/15kV voltage levels. Long-term continuous allowable operating temperature: 90℃; short-circuit heat resistance temperature can reach 250℃ within 5 seconds, and it can withstand the instantaneous overcurrent impact during power grid short-circuit faults. It has stable insulation performance under high-voltage AC conditions, and its insulation performance does not deteriorate after long-term seasonal temperature cycling.

Outer Semiconductor Shielding Layer

The co-extruded outer semiconductor layer is tightly bonded to the insulation layer and works in conjunction with the copper tape metal shielding layer to form a closed electric field buffer structure, preventing localized electric field concentration caused by cable bending, compression, and construction scratches.

Continuously Wound Copper Tape Metal Shielding Layer

Overlapping soft copper tape shielding layers cover each insulated core wire, conducting induced currents and short-circuit ground fault currents in the 15kV power grid, isolating internal high-voltage electromagnetic radiation, and preventing interference with adjacent signal, control, and monitoring cables in the integrated utility tunnel. The shielding layer cross-section meets the standard short-circuit grounding capacity requirements of the 15kV distribution network.

Integrated PVC Extruded Liner

A seamless extruded PVC inner sheath wraps around the three-core shielding assembly, isolating the copper tape shielding layer from the outer steel tape armor layer, preventing underground moisture, soil salinity, weak acids, and weak alkalis from corroding the metal shielding layer and XLPE insulated core wires.

Double-layer galvanized steel strip armor

The two layers of staggered, overlapping galvanized steel strips spirally wound together provide strong radial compressive strength, resisting sharp rock friction, heavy vehicle crushing, construction machinery impacts, and the gnawing of underground rodents. Controlled, uniform winding gaps prevent the edges of the armored steel strips from scratching the lining during cable traction and bending.

UV-Stable Black PVC Outer Sheath

This PVC composite outer sheath is resistant to aging, ozone, and bacterial corrosion. Suitable for direct underground installation, pipe crossings, cable trenches, and semi-outdoor laying; it provides stable corrosion resistance in salt spray coastal areas and chemically polluted soils.

• ZA/ZB/ZC-YJV22 8.7/15kV 3×95: Flame-retardant type, suitable for enclosed pipeline corridors, chemical plants, and underground utility tunnels.
• WDZ-YJV22 8.7/15kV 3×95: Low-smoke halogen-free type, suitable for hospitals, data center substations, and underground commercial complexes.
• Special Salt Spray Resistant Outer Sheath Type: Customized for coastal industrial areas and offshore power projects.

Rated AC Working Voltage:

8.7/15kV Three-phase medium-voltage system

Power Frequency Withstand Voltage Test:

39kV, no breakdown or discharge after 15 minutes

Lightning Impulse Withstand Voltage:

105kV, positive and negative pole impulse test passed

Partial Discharge Characteristics:

Discharge amplitude <10pC under rated working voltage, long-cycle operation stability

Reference Continuous Current Carrying Capacity:

Standard direct burial installation is... 268A; 232A for layered cable trench laying

Dielectric loss tangent:

Ultra-low loss design, which can reduce long-term power grid heat loss.

Minimum allowable bending radius during installation:

15 times the cable outer diameter

Static compression resistance:

Passes heavy-load compression test; insulation layer shows no cracking or permanent deformation.

Ambient temperature requirements for laying:

Standard model ≥ 0℃; Low-temperature customized model supports laying at -20℃ without preheating.

Tensile strength:

Optimized overall structural tensile strength to prevent core wire misalignment during long-distance cable laying.

Standard buried laying design service life:

Over 35 years

Vertical water penetration resistance:

Passes 100-meter long-term immersion test; suitable for water-rich foundations and cable trenches across rivers.

Chemical corrosion resistance:

Resistant to weak soil acids, weak alkalis, and chloride ion corrosion.

UV aging resistance:

Allows long-term semi-outdoor cable trench laying without sheath cracking.

The composite structure of an inner semi-conductive shielding layer + cross-linked polyethylene (XLPE) insulation layer + outer semi-conductive shielding layer + continuous copper strip metal shielding layer solves the most common fault factor in 15kV medium-voltage cables: partial discharge breakdown. For lines operating 24/7, such as substation outgoing trunk lines and factory fixed transformer incoming lines, this multi-layer shielding layout significantly reduces the probability of unplanned power outages and alleviates the workload of daily inspection and maintenance for the operation and management team. Compared with single-layer shielded medium-voltage cables, the long-term circuit failure rate is significantly reduced.

Double-layer steel strip mechanical protection adapts to high-risk laying scenarios, including municipal road crossings, mountain rock foundation trenches, underground pipelines in heavy-duty parking lots, and urban integrated utility tunnels. This effectively avoids insulation damage commonly caused by foundation settlement, impact from temporary construction equipment, and friction from underground sharp rocks in 15kV power grid renovation projects, thereby reducing the general contractor's investment in cable replacement and circuit maintenance in the later stages.

The 95mm² three-core cable is the mainstream medium-section specification for 15kV 1250kVA~1600kVA transformer incoming cables. It provides sufficient current-carrying capacity to handle the full-load current of the transformer while avoiding the cost waste caused by using excessively large 120/150mm² cables. Design engineers widely choose this specification for small and medium-sized industrial parks, community-specific substations, and distributed photovoltaic booster stations to achieve a reasonable match between load demand and project investment budget.

The three insulated cores are integrally molded using a flexible, non-hygroscopic filler, resulting in a simple and rounded overall shape. Compared to three separately laid single-core armored cables, this three-core cable saves cable tray space, reduces the number of conduits and installation time, significantly shortens the electrical wiring construction cycle for EPC contractors, and reduces labor costs.

The fully automated integrated production line performs real-time online thickness monitoring of the insulation, shielding, and armor layers. The insulation thickness, copper tape overlap rate, and steel tape winding tightness of each production batch are controlled within strict standard tolerances. All cable reels have consistent electrical parameters, eliminating the risk of localized overheating and uneven voltage distribution when multiple cables are connected in parallel in a 15kV distribution network.

• Municipal Power Grid Upgrade: Urban 15kV distribution network upgrade, community dedicated transformer incoming and outgoing cables, underground medium-voltage trunk lines for roads, power supply circuits for municipal integrated utility tunnels
• Industrial Manufacturing Projects: Main incoming cables for transformers in small and medium-sized factories, ground distribution circuits in mining areas, centralized power supply lines for light industrial parks
• New Energy Infrastructure: Connecting cables for distributed photovoltaic booster stations, medium-voltage transmission trunk lines for small wind farms, auxiliary 15kV power cables for energy storage stations
• Public and Commercial Construction: Dedicated underground transformer power supply substations for hospitals, schools, logistics industrial parks, and suburban commercial complexes

Case 1: Township 15kV Distribution Network Upgrade Project

A county-level power grid upgrade project used a large number of YJV22 8.7/15kV 3×95 cables as the buried outgoing cables for 10 newly built community box-type transformers. The construction area included riverbank water-bearing soil layers and crossed municipal roads in several places. The double-layer steel strip armored structure effectively resisted the crushing and squeezing during subsequent road expansion construction; the complete set of third-party testing reports provided by our factory passed the power bureau's acceptance, requiring no additional testing. After 3 years of grid connection, no partial discharge or insulation aging faults occurred, saving 65% of the labor costs for power grid inspection and maintenance.

Case 2: 80MW Distributed Photovoltaic Substation Grid Connection Project

A mountain photovoltaic power station selected ZC flame-retardant YJV22 8.7/15kV 3×95 cables as the medium-voltage collection line between the substation and the photovoltaic combiner box. The project site had strong outdoor ultraviolet radiation and residual chloride salts in the soil. The system employs an UV-resistant and corrosion-resistant outer sheath and copper strip shielding structure, effectively resisting harsh outdoor environments and electromagnetic interference between parallel medium-voltage lines. Complete certification documentation expedited the grid connection review process for the EPC contractor, enabling the project to commence operation ahead of schedule.

Case 3: Dedicated Transformer Power Supply Project for a Light Industrial Park

A machinery manufacturing park constructed 12 sets of 1600kVA box-type transformers, uniformly using YJV22 8.7/15kV 3×95mm² cables as underground incoming trunk lines. The underground soil contained residual weakly acidic wastewater from workshop production. Custom-designed reinforced anti-corrosion outer sheaths avoided the premature aging of sheaths and corrosion of the metal shielding layer common in older cable lines. Stable current carrying capacity and balanced electric field performance ensured uninterrupted 24-hour power supply to production equipment, reducing annual line maintenance and downtime losses by more than 80%.

1. Transformer Load Matching: This 3×95mm² specification is suitable for 1250kVA~1600kVA 15kV transformers. For transmission distances exceeding 500 meters, please submit the transformer capacity, transmission distance, and load factor to our technical team for free voltage drop simulation calculations to avoid excessive voltage loss at the load end.
2. Laying Environment Classification Matching: Standard YJV22 is used for ordinary urban soils; reinforced anti-corrosion version is used for coastal salt spray and chemical residue soils; flame-retardant/low-smoke halogen-free modified version is used for enclosed pipeline corridors and public building substations.
3. Shielding Specification Confirmation: All buried 15kV three-core cables must retain a complete copper tape metal shielding layer; unshielded cables are prohibited to prevent electromagnetic interference to nearby monitoring and communication low-current cables.

1. Ambient Temperature Control: The ambient temperature for standard cable laying must not be lower than 0℃; for low-temperature construction, low-temperature modified cables must be used to avoid brittle cracking of the outer sheath during bending and pulling.
2. Bending Radius Limitation: The bending radius for all turns, conduit installations, and transformer terminal connections must be ≥ 15 times the cable's outer diameter; forced sharp bends are prohibited to prevent cracking of the internal cross-linked polyethylene (XLPE) insulation layer and the risk of hidden partial discharge.
3. Requirements for Parallel Cable Laying: Sufficient heat dissipation gaps should be reserved between parallel medium-voltage cables to prevent heat accumulation leading to a decrease in actual current carrying capacity; isolation baffles should be installed in cable trenches to separate medium-voltage and low-voltage cable areas.
4. Road Crossing Protection Measures: A reinforced concrete protective layer should be laid above the cables under the motor vehicle lane to withstand the long-term rolling load of vehicles; cable lengths should be reserved at both ends of transformers and distribution cabinets for future cable terminal replacement and circuit maintenance.

1. Before the acceptance process begins, check the batch inspection certificate, third-party type test report, and copper certificate of origin.
2. After cable laying and terminal production are completed, perform power frequency withstand voltage testing and partial discharge detection.
3. Measure the insulation resistance of each phase core wire to ensure the data meets the 15kV medium-voltage cable acceptance standard.
4. Complete reliable grounding connections for the copper tape shielding layer and steel tape armor layer, and test the grounding resistance to meet the power grid safety operation specifications.
5. Complete reliable grounding connections for the copper tape shielding layer and steel tape armor layer, and test the grounding resistance to meet the power grid safety operation specifications.

• Each shipment comes with a complete set of official certification materials stamped by the factory: National Power Industry Type Test Report, IEC Certificate of Conformity, CE Certification, Copper Certificate of Origin, Batch Production Inspection Records, and Professional Terminal Production and Laying Guidance Manual. These documents fully meet the requirements for power bureau filing, construction supervision review, fire safety acceptance, and overseas customs clearance, avoiding project construction delays due to incomplete supporting materials.

• Our in-house medium-voltage cable design team provides free technical consultation services: transformer load current carrying capacity calculation, long-distance voltage drop simulation, cable specification matching recommendations, flame retardant rating selection, and laying scheme optimization. For large-scale municipal, new energy, and industrial bulk orders, engineers can provide remote video on-site construction guidance, promptly helping construction teams solve technical problems related to terminal manufacturing, cable laying, and acceptance.

• We have a long-term exclusive supply partnership with a top-tier T2 oxygen-free copper smelter, strictly prohibiting the mixing of recycled copper raw materials. Before shipment, samples of each batch are sent to a high-voltage laboratory for comprehensive performance testing; during production, insulation thickness, copper shielding layer overlap rate, and steel tape armor winding tightness are monitored online in real time to ensure consistent electrical performance of all cable reels and eliminate the risk of parameter deviations between different batches.

• We have a professional, automated medium-voltage cable production workshop with ample stock of mainstream YJV22 8.7/15kV 3×95 cables, ready for immediate shipment. For key municipal, new energy, and industrial EPC projects, we prioritize the production of customized flame-retardant, low-smoke halogen-free, and corrosion-resistant modified cables to match the construction schedules of engineering contractors.

• Each reel of cable is marked with a unique production batch number, production date, voltage rating, and core specifications, enabling full-process production traceability. Large-volume engineering orders enjoy extended factory quality assurance periods. During the warranty period, if there are non-human-caused defects in insulation, shielding, or armor due to factory manufacturing processes, we will provide free replacement and product replacement services to minimize the project operation risks for our customers.