I. Basic Definition and Model Designation Model Breakdown YJY 8.7/15kV
1. YJ: Cross-linked polyethylene (XLPE) insulation
2. Y: Polyethylene (PE) outer sheath
3. 8.7/15kV: Rated voltage \(U_0/U\)=8.7/15kV, commonly known in engineering as 10kV distribution cable, maximum system operating voltage 17.5kV
II. Core Technical Parameters and Operating Characteristics
1. Standard: GB/T 12706.2-2020
2. Long-term allowable conductor operating temperature: 90℃
3. Short-circuit ≤5s limit withstand temperature: 250℃
4. Minimum installation ambient temperature: ≥-20℃ (low-temperature resistance superior to PVC-sheathed YJV)
5. Minimum bending radius: ≥15 times the cable outer diameter
6. Electrical tests: Power-frequency withstand voltage 30.5kV/5min, lightning impulse withstand voltage 95kV
7. Material advantages: PE sheath resists soil corrosion and hydrolysis; combustion does not produce large amounts of toxic hydrogen chloride fumes
8. Installation restrictions: Unarmored, not suitable for direct soil burial, not resistant to external compression or impact
III. Main Application Scenarios Suitable for AC 50Hz 10kV three-phase distribution fixed installation:
1. Substation cable trays, cable tunnels, enclosed cable trenches, urban utility tunnels
2. Indoor high-voltage lines in photovoltaic and wind power booster stations
3. Distribution mains in severe cold regions and mildly corrosive environments with protected conduits
Prohibited conditions: Direct soil burial, unprotected areas beneath roads; for direct burial selection, choose YJY22 8.7/15kV
IV. Standard Specifications Mainstream core count: 3 cores; single-core available for high-capacity circuits
Common conductor cross-sections (mm²): 50, 70, 95, 120, 150, 185, 240, 300, 400
