As a key carrier of modern power transmission, the selection of Overhead Aerial Cable,
directly impacts the reliability, safety, and economic efficiency of power grid operations.
These cables, with their conductors encased in insulation, combine the mechanical strength
of overhead conductors with the protective properties of cables. They offer unique
advantages for distribution network upgrades, power transmission in complex terrain,
and environmentally sensitive areas. Their core value lies in three key aspects: First, their
insulation design reduces phase-to-phase distances, enabling the installation of multiple
circuits on the same pole, improving space utilization; second, their corrosion and damage
resistancesignificantly reduces short-circuit failure rates, making them particularly suitable
for areas with dense trees, pollution, or high lightning risk; third, their lower cost and easier
installation compared to underground cables make them an ideal choice for urban and
rural distribution network upgrades. Proper selection not only extends line life but also
reduces power outages and reduces maintenance costs. The selection of Overhead Aerial
Cable must consider the three key factors: conductor material, insulation material, and
structural characteristics, precisely matching them to the environment and load
requirements.
The following is an analysis of key selection parameters:
Conductor Material
Copper Core (JKYJ): Optimal conductivity (resistivity 0.0175Ω·mm²/m) and high
mechanical strength,making it suitable for high-reliability scenarios (such as urban
core areas and transformer down conductors). However, it is costly and heavy,
requiring reinforced tower support.
Aluminum Core (JKLYJ): Lightweight (only 40% of copper core) and affordable, suitable
for rural areas and ow-voltage power distribution, but requires a larger l cross-sectional
area to compensate for the increased conductivity (resistivity 0.0283Ω·mm²/m).
Aluminum Stranded Steel Core (JKLGYJ): The steel core provides tensile strength
(≥250MPa) and is designed for large spans (such as river crossings) and heavy icing
areas. It offers low sag and resistance to wind vibration.
Insulation Material
Cross-Linked Polyethylene (XLPE): Offers a wide temperature range (-50°C to +90°C) and
strong aging resistance, making it the mainstream choice for lines 10kV and below(e.g.,
JKLYJ-10kV).
Polyvinyl chloride (PVC): Resistant to acid and alkali corrosion, suitable for chemical
plants and coastal salt spray areas (e.g., JKLGJV), but susceptible to aging under long-
term high temperatures.
Structural Characteristics
Lightweight (Q suffix): Small bending radius (≥15D), suitable for narrow alleys or complex
paths.
Self-supporting (e.g., JKLGYJ/Q): Integrated load-bearing structure reduces the number of
support rods and construction costs.
Environmental Adaptability Key Points:
Temperature: Choose cold-resistant types (-50°C) for cold regions; XLPE insulation for
high-temperature areas.
Corrosion: Aluminum alloy core (JKLHYJ) or PVC insulation is preferred for coastal or
industrial areas.
Mechanical Stress: Typhoon-prone areas require enhanced wind resistance (e.g., steel core
with large cross-section).
By combining parameters, you can quickly locate the model. For example, the JKLYJ-10kV-
150mm² (aluminum core + XLPE insulation) is suitable for general power distribution,
while the JKLGYJ-10kV- 40mm² (steel core aluminum stranded wire) specializes in long
2-span power transmission.
