Rated Voltage 6–35 kV XLPE Insulated Waterproof Power Cable (FS-YJ Series)

Executive Standards
This series strictly complies with the following national and enterprise-specific technical specifications:
- Q/320481SS032-2022: Enterprise standard for rated voltage 6–35 kV XLPE insulated waterproof power cables.
- GB/T 12706.2: Power cables with extruded insulation and their accessories for rated voltages from 6 kV up to 30 kV.
- GB/T 12706.3: Power cables with extruded insulation and their accessories for rated voltage of 35 kV.

Model Code Definitions
- FS: Waterproof characteristic code.
- YJ: Cross-linked polyethylene (XLPE) insulation.
- L: Aluminum conductor (omitted for copper conductor).
- V / Y: Sheath material (V-PVC; Y-PE).
- 22 / 23 / 32 / 33 / 42 / 43: Represent different armoring structures. Models containing "3" (such as 23, 33) typically use a polyethylene sheath, providing better water blocking performance.

Product Specification Range
The cables cover single-core and three-core configurations. Conductor cross-section design varies dynamically according to voltage level:
1. 3.6/6 kV to 8.7/15 kV grades:
   - Single-core: 25 – 1000 mm²
   - Three-core: 25 – 500 mm²
2. 12/20 kV grade:
   - Single-core: 35 – 1000 mm²
   - Three-core: 35 – 500 mm²
3. 18/20 kV to 26/35 kV grades:
   - Single-core: 50 – 1000 mm²
   - Three-core: 50 – 500 mm²

Core Technical Parameters
1. Conductor operating temperature: The maximum allowable long-term operating temperature is 90°C; during a short circuit (up to 5 s), the maximum conductor temperature is 250°C.
2. Waterproof performance: A comprehensive waterproof structure is adopted. Radial water blocking is achieved through a polyethylene sheath or aluminum-plastic composite tape; longitudinal water blocking is realized by applying water blocking tape and water blocking yarns to prevent moisture from penetrating longitudinally along the cable core.
3. Electrical performance: At 1.73 U₀, partial discharge ≤ 5 pC; insulation resistance constant (at 90°C) ≥ 3.67 MΩ·km.
4. Bending radius: Single-core unarmored cable ≥ 20D, three-core armored cable ≥ 12D (D is the outer diameter of the cable).

Cable Waterproof Structural Characteristics
- Comprehensive waterproof layer: A composite system is generally adopted, such as "water blocking tape lapping + aluminum/plastic composite tape longitudinal wrapping + extruded polyethylene sheath", providing a superior radial water blocking and longitudinal water blocking barrier.
- Highly reliable insulation: XLPE insulation not only offers high mechanical strength and large current-carrying capacity, but also has strong resistance to chemical corrosion and environmental stress cracking.
- Corrosion-resistant sheath: Compared with PVC, the polyethylene (PE) outer sheath has lower moisture vapor permeability and stronger moisture resistance.

Applicable Scenarios
- Coastal and damp areas: Environments with long-term water accumulation or high humidity, such as underground cable trenches and tunnels.
- River and waterway crossings: Suitable for underwater installations or power lines crossing swampy areas.
- Critical infrastructure projects: Power transmission and distribution circuits with high moisture-proof requirements in subways, power plants, and mines.

Selection and Installation Recommendations
- Sheath selection: For direct burial or long-term immersion environments, it is strongly recommended to use polyethylene-sheathed armored types such as YJ(L)Y23 or YJ(L)Y33 to achieve the best water blocking performance.
- Sealing treatment: During installation, cable ends must be treated with strict waterproof sealing to prevent moisture ingress into the cable core during the laying phase.
- Installation temperature: The ambient temperature during installation should not be lower than 0°C. Otherwise, preheating is required to prevent sheath cracking from cold brittleness.