Product Features and Applications
• This type of product is mainly used for fixed overhead laying. Products with flexible copper conductors are used for transformer down leads. When erecting the cable, a certain distance between the cable and trees shall be kept. Frequent contact between the cable and trees is permitted during cable operation.
Manufacturing Standards
• This type of product is in accordance with GB/T14049-1993 《Rated Voltage 10kV/35kV Overhead Insulated Cables》
Product Service Characteristics
• Rated voltage: 10(12)kV, 35(42)kV. The cables can be used in systems where the single-phase earth fault duration is generally no more than 1 min each time, and also applicable to systems with maximum duration no more than 8h each time and cumulative duration no more than 125h per year.
• Under short-circuit condition (maximum duration not exceeding 5s), the maximum temperature of cable conductor shall not exceed 250C. The ambient temperature during cable laying shall not be lower than 20°C.
• Maximum long-term permissible operating temperature of cable conductor: 90°C (for cables with load-bearing structure).
• The bending radius during cable laying shall not be less than the following requirements: single-core cable - 20(D+d)mm, multi-core cable - 15(D+d)mm (D and d are the outer diameter of cable and nominal diameter of main conductor respectively
Technical Parameters
• At room temperature, immerse the cable in water for no less than 1h, apply DC voltage of 80-500V, the stabilization time shall be no less than mn and no more than 5min.
• At room temperature, immerse the cable in water for no less than 1h and then apply test voltage for a stabilization time of 1min; the cable shall not break down.
• For insulated shielded three-core 10kV cables, the discharge quantity shall not be more than 20PC. Partial discharge test shall be carried out on the finished cable immersed in water. When AC voltage of 9kV is applied to the cable, the discharge quantity of the cable shall not be more than 20PC.
• Conditions for current-carrying capacity calculation: ambient air temperature 25°C; single-core cables laid in parallel, the center spacing S=300mm.
