Henan Crosslink Cable Co., Ltd.
High voltage cable
Category:
Power Cable
Product
Key words:
Medium and high voltage power cables are mainly used in urban distribution networks, industrial power supply, new energy generation (such as wind power, photovoltaic) and substation connection. Its design needs to meet the requirements of high insulation strength, mechanical protection and environmental adaptability.
1. Product structure and materials
(1) Conductor
Material:
Copper conductor: high conductivity, suitable for high current transmission (e.g. T1/T2 electrolytic copper).
Aluminum conductor: lightweight, low cost (such as 1350/H19 aluminum).
Construction:
Tightly pressed round: reduces conductor gaps and avoids partial discharges (commonly used for 35kV and above).
Split conductor (large cross-section cables): improve skin effect, reduce losses.
(2) Conductor shielding layer
Role: uniform electric field distribution, to prevent the conductor surface burrs caused by corona discharge.
Material: cross-linked semi-conductive material (compatible with the insulation layer).
(3) Insulation layer (core part)
Material:
Cross-linked polyethylene (XLPE): Mainstream choice, temperature resistance 90℃, short circuit allowed 250℃ (5 seconds).
Ethylene Propylene Rubber (EPR): flexible, suitable for mobile applications (e.g. mining cables).
Thickness:
10kV cable: insulation thickness about 4.5mm.
35kV cable: insulation thickness of about 8.0mm.
(4) Insulation Shield
Works in conjunction with the conductor shield to ensure an even electric field and prevent discharges at the edges of the insulation.
(5) Metal shielding layer
Role:
Short-circuit current path (copper tape/copper wire shielding).
Electromagnetic shielding (reduce external interference).
Structure:
Copper tape winding (commonly used for 10-35kV).
Copper wire sparse winding + copper tape (large cross-section or high short-circuit capacity requirements).
(6) Armor layer (optional)
Type:
Steel tape armored (e.g. 22 structure): pressure resistance, suitable for direct burial.
Steel wire armored (e.g. 32/33 structure): tensile resistance, for underwater or shaft laying.
(7) Outer sheath
Material:
PVC (polyvinyl chloride): economic, flame retardant, suitable for general environment.
PE (polyethylene): corrosion-resistant, suitable for direct burial or wet environment.
LSZH (Low Smoke Zero Halogen): flame retardant and low toxicity, used in tunnels, subways and other closed places.
Color: Usually black (UV resistant), or by standard color separation (e.g. yellow/green/red).
Cable type and main application.
| Model Type | Name | Main application | |
| Copper core | Aluminum core | ||
| (ZR)YJV or or(ZR)YJY | (ZR)YJLV or or (ZR)YJLY | (Flame retardant) copper, aluminum core crosslinked polyethylene insulated polyvinyl chloride sheathed power cables (Flame retardant) copper, aluminum core cross-linked polyethylene insulated polyethylene sheathed power cable | Suitable for indoor, tunnel, pipeline and cable trench, can also be laid in the loose soil, does not bear mechanical tension and pressure. |
| (ZR)YJV22 or or (ZR)YJY23 | (ZR)YJLV22 or or (ZR)YJLY23 | (Flame retardant) copper, aluminum core crosslinked polyethylene insulated steel tape armored PVC sheathed power cables (Flame retardant) copper, aluminum core cross-linked polyethylene insulated steel tape armored polyethylene sheathed power cable | Suitable for indoor, tunnel, pipeline, cable trench and underground direct burial laying, the cable can withstand mechanical pressure, but can not withstand large tensile force. |
| (ZR)YJV32 or or (ZR)YJY33 | (ZR)YJLV32 or or (ZR)YJLY33 | (Flame retardant) copper, aluminum core crosslinked polyethylene insulated fine steel wire armored PVC sheathed power cables (Flame retardant) copper, aluminum core cross-linked polyethylene insulated fine steel wire armored polyethylene sheathed power cable | Suitable for vertical wells, underwater and laying under drop or vertical conditions, the cable can withstand mechanical pressure and considerable tension. |
| (ZR)YJV42 or or (ZR)YJY43 | (ZR)YJLV42 or or (ZR)YJLY43 | (Flame retardant) copper, aluminum core crosslinked polyethylene insulated thick steel wire armored PVC sheathed power cables (Flame retardant) copper, aluminum core cross-linked polyethylene insulated thick steel wire armored polyethylene sheathed power cable | It is suitable for laying in water, under the sea, and with drop or vertical laying, and can withstand large mechanical pressure and tensile force. |
(2) International standard comparison
China: GB/T 12706 (equivalent to IEC 60502).
International: IEC 60502-2 (1kV~30kV), IEC 60840 (30kV~150kV).
USA: IEEE 404, UL 1072.
3. Key performance parameters
Rated voltage:
10kV cable: U₀/U=6/10kV, Um=12kV.
35kV cable: U₀/U=21/35kV, Um=40.5kV.
Temperature resistance rating:
Long-term operation: 90°C (XLPE), 250°C in short circuit (5 seconds).
Bending radius:
Single-core cable: ≥20×cable outer diameter.
Three-core cable: ≥15×cable outer diameter.
Short-circuit capacity:
Copper conductor (300mm²): approx. 40kA/1s.
4. Typical application scenarios
Urban power grid: 10kV cable is used for ring network cabinet and substation outlet.
Industrial power supply: 35kV cable connecting large motors and transformers.
New energy: photovoltaic power station collector lines, wind power tower inside the laying.
Special environment:
Direct burial: YJV22/YJLV22 (steel belt armor + PE sheath).
Underwater: YJV32 + waterproof layer (such as lead sheath).
Cold area: low temperature resistant sheath (-40℃ keep flexible).
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