1. Product executive standard

GB/T 28427-2012。

2. Product application scope

AC single-phase, power frequency, rated voltage and feeder from traction substation, section post, switching post, autotransformer, etc. The laying place is divided into underground direct burial, pipe laying, ground cable trench, underground tunnel, cable interlayer of substation or partial outdoor laying, etc.

3. Product use characteristics

3.1. Rated voltage: 27.5kV.

3.2. The maximum allowable long-term working temperature of conductor is 90 ℃, and the maximum temperature of conductor in case of short circuit (the short circuit time shall not exceed 5S) is 250 ℃.

3.3. Ambient temperature of cable installation: - Ge; 0 ℃; ambient temperature of cable use: - 15 ℃ ~ + 60 ℃.

3.4. Minimum bending radius of cable installation: 12D.

4. Main technical indexes of cable

4.1. Conductor structure: bare copper, conforming to the second type of stranded conductor in GB / T 3956.

4.2. Conductor shielding, insulation and insulation shielding adopt the fully enclosed chemical crosslinking three-layer coextrusion process, and the material performance meets the relevant requirements of GB / T 28427.

4.3. Shielding material: copper wire, copper tape, in accordance with the relevant requirements of GB / T 28427.

4.4. Armor material: aluminum wire, in accordance with the relevant requirements of GB / T 28427.

4.5. Sheath material: low smoke and halogen-free polyolefin, low smoke and halogen-free polyolefin, meeting the relevant requirements of GB / T 28427.