What is an overhead bare cable?
Definition of overhead bar cable
Without any insulation sheath, it is directly installed outdoors on power poles and towers, mainly used for high-voltage/ultra-high voltage overhead transmission lines.
Classification of overhead bar cables
|
Abbreviation |
Full name |
Structure Overview |
Typical application scenarios |
|
ACSR |
Aluminum Conductor Steel Reinforced |
Outer aluminum strand (conductive)+central steel core (capable of withstanding tension) |
High voltage transmission mainline, the most mainstream in domestic power grid and overseas transmission and distribution; 10kV~500kV overhead power line |
|
AAAC |
All Aluminum Alloy Conductor |
All made of aluminum alloy single wire twisted without steel core |
Medium and low voltage distribution lines, coastal corrosive environments, lightweight installation; 10~110kV |
|
AAC |
All Aluminum Conductor |
Pure aluminum single wire twisted as a whole, without reinforcing core |
Low voltage short distance distribution and rural power grid branch lines; Low voltage ≤ 35kV, small span lines |
|
GS/GW |
Galvanized Steel Strand |
All hot-dip galvanized steel wires are twisted together and non-conductive (rarely used for current carrying) |
Lightning protection grounding wire, tower stay wire, and optical cable support (OPGW skeleton) do not transmit electrical energy |
ACSR steel cored aluminum stranded wire
Aluminum: Conductive (Aluminum has excellent conductivity and is lightweight)
Steel core: only capable of withstanding mechanical tensile force
Advantages and disadvantages: The best balance of conductivity and mechanical strength, the highest cost-effectiveness, and the universal disadvantage of the global power grid: electrochemical corrosion exists on the steel aluminum contact surface, and the service life is shortened in highly corrosive coastal environments
Voltage used: 10kV, 35kV, 110kV, 220kV, 500kV high-voltage overhead main lines
AAC all aluminum stranded wire
The entire aluminum wire has no steel core
Advantages: Low price;
Disadvantages: Low tensile strength, unable to be installed over large spans. Suitable for low voltage short distance rural power grids, urban 10kV branch lines, and small span distribution lines
Not suitable for mountainous areas and large-span power transmission across rivers
AAAC aluminum alloy stranded wire
The overall use of aluminum magnesium silicon alloy wire, without steel core compared to ordinary pure aluminum (AAC): higher tensile strength, stronger corrosion resistance compared to ACSR: smaller self weight, no steel aluminum electrochemical corrosion
Core scenario: Coastal and industrial areas with severe corrosion
Galvanized Steel Strand
Almost not used as a current carrying wire! Unable to transmit electricity, extremely poor conductivity, relying solely on metal strength for stress
Purpose: ① Overhead ground wire (lightning protection wire) at the top of transmission towers ② Tension pull wire for power poles and iron towers
Special: The OPGW fiber optic composite ground wire consists of steel strands and optical fibers inside.
|
Model |
Tensile strength |
Corrosion resistance |
Cost |
Recommended scenarios |
|
ACSR |
★★★★★ |
★★★☆☆ |
moderate |
Long distance, large span, main high-voltage transmission |
|
AAAC |
★★★★☆ |
★★★★★ |
Relatively high |
Coastal and chemical plant corrosive environment, medium voltage distribution |
|
AAC |
★★☆☆☆ |
★★★☆☆ |
Minimum |
Short distance low-voltage branch lines, budget limited small-scale projects |
|
Galvanized Steel Strand |
★★★★★ |
★★★☆☆ |
Low |
Ground wires and cables are prohibited from being used for power transmission |
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