ACSSAS (Aluminum Conductors-Aluminum Clad Steel Supported)

Aluminum clad steel supported aluminum conductor is a high-performance composite overhead wire that combines a "high conductivity aluminum layer" and an "aluminum clad steel support core". It is made through concentric twisting technology, and the core design uses the aluminum clad steel core as the mechanical support body, with the outer aluminum conductor responsible for the transmission of electrical energy. Its innovation uses an aluminum coating to isolate the steel core from the outer aluminum conductor, completely solving the electrochemical corrosion problem caused by direct contact between steel and aluminum in traditional steel core aluminum stranded wire (ACSR), while retaining the high strength of steel and the excellent conductivity of aluminum.

Atructure:

Supporting core: Aluminum clad steel core layer.Located at the center of the wire, it is made up of 1, 7, or 19 strands of aluminum clad steel wire twisted together, with a single wire structure of "low carbon steel core+tightly wrapped aluminum layer". The thickness of the aluminum layer is usually not less than 10% of the diameter of the steel wire.

Conductive layer: Aluminum conductor layer.The aluminum clad steel core is arranged in concentric layers using high-purity 1350 series aluminum wire. The conventional type uses hard aluminum wire to balance strength and conductivity, while the high temperature resistant type uses fully annealed aluminum wire to enhance high temperature stability.

Core characteristics:

Ultimate corrosion resistance performance.

Balance between high strength and lightweight.

Excellent conductivity and high temperature stability.

Self damping and anti vibration characteristics.

Electrical performance:

DC resistance: Equivalent to ACSR under the same specifications, some small section specifications have slightly lower resistance due to the participation of aluminum clad steel core and aluminum layer in conductivity, resulting in less energy transmission loss.

Current carrying capacity: The conventional 25 ℃ current carrying capacity is consistent with the same cross-sectional ACSR, while the high-temperature resistant type can maintain high current carrying capacity at 250 ℃.

High temperature stability: After continuous operation at 250 ℃ for 1000 hours, the mechanical strength retention rate of high-temperature resistant products is ≥ 95%, the sag change is ≤ 2%, and there is no risk of aluminum creep failure.

Construction parameters:

Installation temperature: Recommended construction temperature -20 ℃~45 ℃. Aluminum clad steel core has better low-temperature toughness than galvanized steel core, and preheating treatment is not required below -20 ℃.

Tension control: For conventional construction, the tension should not exceed 45% of the minimum failure load. For high-temperature resistant construction, the tension should be reduced to below 40% due to the soft state of the aluminum conductor.

Bending radius: Ordinary type ≥ 18 times the outer diameter of the wire, irregular aluminum wire specification ≥ 20 times, high temperature resistant type requires ≥ 22 times due to the softer aluminum layer.

Application scenarios:

Coastal and island power grids: such as the Hainan Island 220kV transmission line and the Zhoushan Islands distribution network, the salt spray corrosion resistance of aluminum clad steel cores can reduce the need for line replacement maintenance every 10 years and lower the overall lifecycle cost.

Industrial pollution areas: 10kV-110kV outgoing lines in chemical industrial parks and metallurgical plant areas to resist industrial waste gas corrosion and ensure continuous production power supply.

Strong wind and large-span areas: 35kV transmission lines in strong wind areas such as Xinjiang and Inner Mongolia have self damping characteristics after pre stretching treatment, effectively reducing wire damage caused by wind-induced fatigue.