I. Basic Definition and Model Designation Model Breakdown YJY22 26/35kV
1. YJ: Cross-linked polyethylene (XLPE) insulation
2. Y: Polyethylene (PE) inner bedding layer
3. 2: Double-layer steel tape armor
4. 2: Polyethylene (PE) outer sheath
5. 26/35kV: Rated voltage \(U_0/U\)=26/35kV, system nominal line voltage 35kV, maximum operating voltage 40.5kV
Key distinction:
YJV22: Inner bedding and outer sheath are PVC;
YJY22: Inner bedding and outer sheath are PE, offering superior corrosion resistance and low-temperature performance.
II. Core Technical Parameters and Operating Characteristics
1. Standard: GB/T 12706.3-2020
2. Long-term allowable conductor operating temperature: 90℃
3. Short-circuit ≤5s limit withstand temperature: 250℃
4. Minimum installation ambient temperature: ≥-20℃ (PE sheath low-temperature resistance far superior to PVC sheath YJV22)
5. Minimum bending radius: ≥20 times cable outer diameter
6. Test requirements: Power-frequency withstand voltage 91kV/5min, lightning impulse withstand voltage 185kV
7. Product advantages
PE sheath resists hydrolysis, soil acid and alkali corrosion, and is not prone to brittle cracking at low temperatures;
Does not release large amounts of corrosive hydrogen chloride smoke when burned;
Steel tape armor resists soil gravel compression and external mechanical damage, supporting direct burial installation.
8. Installation limitations: Steel tape armor does not withstand tensile force, not suitable for vertical shafts or large-drop suspended installation; for tensile conditions, select YJY32 fine steel wire armor model.
III. Main Application Scenarios Suitable for AC 50Hz, 35kV three-phase high-voltage power transmission fixed installation:
1. Outdoor direct burial in soil, green belts, underground pipelines in plant areas
2. 35kV power transmission projects in severe cold regions and corrosive soil (saline-alkali land)
3. Cable trenches and comprehensive utility tunnels in sections prone to mechanical damage
4. Direct-buried high-voltage cables outside photovoltaic and wind power booster stations
Not suitable for: Vertical shafts of high-rise buildings, underwater, steep slopes with large drops; YJY32 is preferred.
IV. Standard Specifications Mainstream core count: 3 cores (general for three-phase distribution); single-core structure available for high-capacity circuits
Common conductor cross-sections (mm²): 50, 70, 95, 120, 150, 185, 240, 300, 400, 500, 630
