An overhead conductor outfitted with an insulating layer and a protective sheath is known as a 25-35KV overhead insulated cable. It is a unique cable made using a procedure that is similar to that used to make cross-linked cables. It is a brand-new technique for transferring power between underground cables and overhead wires. Twisted wires AAC, AAAC, and ACSR are typically used by conductors.The insulating material is 70°C PE or 90°C XLPE.
Features
- The cable is suitable for overhead power with a rated voltage of 25-35kV.Compared with the 10kV distribution network, the distribution capacity of the line is doubled, the power supply radius can be doubled, the voltage loss is 50% of 10kV, and the power loss is reduced by 75%.
- It is simple in structure, safe and reliable, and has good mechanical and insulating properties.In urban and rural power distribution networks, power outages and electric shock accidents are often caused by the contact of overhead bare wires with trees along the line. Using this cable can avoid such accidents, and even in the case of downed poles and dropped wires, it can still continue Power supply, safe and reliable.
Application
It is used for primary and secondary overhead distribution where limited space is available.
If a tree branch or other object comes into contact with the conductor so close, the covering can effectively prevent direct short circuit and instantaneous flashover.
The resulting close proximity configuration minimizes the amount of space and hardware required for line installation; especially useful in congested areas such as alleyways or narrow corridors.
Construction
Conductors are concentric strands AAC (1350-H19), AAAC (compressed or fully compressed depending on conductor size) or ACSR.
Performance
| Nominal cross-section | Apporx.dia. of conductor | Apporx.outer dia. of cable | Approx. weight | Min. breaking load | Max. DC resistance at 20℃ | Current rating in air at 40℃ |
| mm2 | mm | mm | kg/km | kN | Ohm/km | A |
| 10 | 3.8 | 11.8 | 119 | — | 3.08 | 56 |
| 16 | 4.8 | 12.8 | 147 | — | 1.91 | 74 |
| 25 | 6.01 | 14.0 | 185 | 3.76 | 1.2 | 97 |
| 35 | 7.06 | 15.0 | 223 | 5.18 | 0.868 | 115 |
| 50 | 8.18 | 16.2 | 269 | 7.01 | 0.641 | 140 |
| 70 | 9.88 | 17.9 | 348 | 10.35 | 0.443 | 180 |
| 95 | 11.6 | 19.8 | 444 | 13.73 | 0.32 | 215 |
| 120 | 13.09 | 21.3 | 529 | 17.34 | 0.253 | 250 |
| 150 | 14.3 | 22.5 | 616 | 21.03 | 0.206 | 285 |
| 185 | 16.2 | 24.4 | 741 | 26.73 | 0.164 | 330 |
| 240 | 18.61 | 26.8 | 925 | 34.68 | 0.125 | 390 |
