Aerial Cable Suitable For Salt Mist Area
Main features of aerial cable
Good insulation performance. Overhead cable due to a layer of insulating layer, insulation performance than bare wire superior, can reduce the line between the distance, reduce the insulation requirements for the line support parts, improve the number of circuit line.
Good anti-corrosion performance. Aerial cable due to the outer layer of insulation, less than the bare wire by the degree of oxidation corrosion, strong corrosion resistance, Overhead Cable can extend the service life of the line.
Anti-external damage, reduce the impact of trees, flying, metal film and dust and other external factors, reduce the phase of short circuit and grounding accidents.
Strength to meet the requirements. Although the insulated conductor has less steel heart, but tenacity, Overhead Cable the mechanical strength of the entire wire achieves the stress design requirements.
Specification for overhead cables
Line Heart. Aerial cable has aluminum heart and copper heart two kinds. In the distribution network, the application of aluminum heart is more, mainly aluminum is lighter, and cheaper, the line connection and support parts of the low requirements, coupled with the original distribution line to steel core aluminum wire, Overhead Cable the selection of aluminum heart line for easy to connect with the original network. In the actual use also selects the aluminum heart line more. The copper heart line is mainly used as the lead of the transformer and switch equipment.
Insulating materials. The insulating protective layer of the aerial cable is of thick insulation (3.4mm) and thin insulation (2.5mm). The operation of thick insulation allows frequent contact with trees, Overhead Cable and thin insulation is allowed only in short contact with trees. The insulating protective layer is divided into cross-linked polyethylene and light polyethylene, and the XLPE insulation performance is better.
Aerial Cable application area
Suitable for many trees. Bare wires erected on the lines, in more trees, often the erection and maintenance of the line with green and forestry produce a great shield. The use of aerial cable can reduce the felling of trees (erection early and maintenance stage), solve many problems, but also reduce and greening, Overhead Cable forestry and other departments of contradictions, protect the ecological environment, while beautifying the cityscape, and reduce the line grounding fault.
Used to fly metal dust and more pollution areas. In the old industrial area, Overhead Cable due to environmental protection is not up to standard, metal processing enterprises, often have flying metal dust with the wind fluttering. In the thermal power plant, the chemical plant's pollution area, causes the overhead distribution line short circuit, the grounding fault. The use of aerial cable is a good way to prevent short circuit grounding in the distribution line of ten KV.
Suitable for salt mist area. Salt mist on the bare wire corrosion is quite serious, Overhead Cable so that the bare wire tensile strength greatly reduced, encountered wind and rain, lead to wire fracture, resulting in short circuit grounding accident, shorten the line service life. The use of aerial cable, can better prevent salt spray corrosion. Because there is a layer of insulation protection, can reduce salt fog on the conductor corrosion, Overhead Cable delay the aging line, extend the service life of the line.
Suitable for lightning more areas. Overhead cable due to a layer of insulation protection, can reduce the line lightning, even if there is lightning, the impact will be much smaller. In the minefield, the line of the bare wire is used, and the insulation of the line is generally dropped rapidly, Overhead Cable and a burst grounding accident occurs frequently. After replacing the overhead cable, the power failure time of grounding fault can be reduced.
Suitable for the old urban area transformation. Because the overhead cable can withstand a voltage of 15kV, insulated conductor and the minimum vertical distance of the building is 1m, the horizontal distance is 0.75m. Therefore, the 10kV, the overhead cable instead of the Low-voltage trunk, directly into the load center, Overhead Cable shorten the Low-voltage network radius is an effective distribution of Old City transformation.
In favor of typhoon prevention. As the overhead bare wire line of the typhoon resistance is poor, a typhoon, the line tripping up and down. The use of overhead cable, wire instantaneous collision will not cause short circuit, reduce the fault, greatly improve the line's ability to withstand typhoon.
The aerial cable is suitable for AC rated voltage 35KV and below overhead power lines, Overhead Cable which are used in high security requirements in towns, high-rise buildings and forest areas.
2, the use of characteristics:
① rated voltage of 1, 10KV.
Long-term operating temperature of ② cable:
PVC (PVC), polyethylene (PE) insulation should not exceed 70 ℃;
Xlpe (XLPE) insulation should not exceed 90 ℃.
③ Overhead Cable the maximum temperature of a cable conductor when the short circuit (maximum duration is not more than 5 seconds);
PVC insulation does not exceed 160 ℃;
Polyethylene insulation does not exceed 150 ℃;
XLPE insulation does not exceed 250 ℃.
④ Cable laying temperature should not be less than 20 ℃.
The ① conductor shall adopt a tightly pressed circular stranded conductor, and its maximum resistance and minimum tensile force shall conform to the requirements of table 3.
The tensile force of ② Overhead Cable bearing stranded wire should conform to the requirements of table 10.
③ insulation should be used in black weathering PVC, polyethylene and cross-linked polyethylene.
The ④ cable shall withstand the specified AC voltage test for 1 minutes and the insulation shall not penetrate.
⑤ has insulation shielding 10KV cable, Overhead Cable should carry out partial discharge test, its discharging power should not be less than 20PC.