AAAC 120mm2 19/2.84 Aluminum Alloy Overhead Bare Conductor for Overhead Transmission Lines

AAAC 120 mm² is an all aluminium alloy conductor built from 19 strands of 2.84 mm diameter 6201 aluminium alloy wire, concentrically stranded to give a calculated area of 120.12 mm² and an overall diameter of 14.14 mm. Because every strand in the conductor is aluminium alloy, the cable is electrically and metallurgically homogeneous: there is no steel core, no bimetallic interface and no grease-filled gap to age in service. The conductor is supplied bare, in the usual drum lengths, and is intended for overhead transmission and for primary and secondary distribution lines, including spans across basins, rivers and valleys where terrain makes access difficult and where long-term reliability without maintenance matters more than first cost. Production is arranged to GB, IEC, BS, ASTM, DIN, VDE and JIS requirements, so the same 19/2.84 construction can be delivered against the standard and the technical datasheet that the project actually specifies.

The first advantage is corrosion behaviour. With no steel core there is no galvanic couple to drive the bimetal corrosion that shortens ACSR life in coastal belts, salt fog, ammonia-rich farmland and polluted industrial air, and the aluminium alloy surface simply forms a thin protective oxide film. The second advantage is electrical performance. A homogeneous alloy conductor has lower resistance than an ACSR of the same nominal area, so I2R losses along the line drop, and because the alloy strands run at 52.5 % IACS the conductor carries roughly 15 to 20 % more current than an ACSR of equal size, which lets a line be uprated without changing towers or cross-arms. The third advantage is mechanical and economic. AAAC is lighter per metre and, having no steel core to sag differently from the aluminium layers, it behaves predictably under ice and wind loading, with a calculated breaking load of 34.3 kN and a calculated weight of 331 kg/km for this size. Utilities with long service records report all aluminium alloy conductors still in operation after more than sixty years, roughly double the working life normally credited to ACSR, so the maintenance and replacement budget over the life of the line is materially lower.

Conductor quality is settled long before stranding. The 6201 alloy is produced to a controlled chemistry and heat-treated so that it reaches the specified conductivity without sacrificing tensile strength, then drawn to 2.84 mm on dies that are checked for wear so that the wire diameter and surface finish stay within tolerance. Each wire is inspected for diameter, surface defects, laps, cracks and burrs before it is accepted for stranding; wires that would create a stress raiser in service are rejected rather than spliced into the layer. Stranding is carried out on rigid-frame machines with the lay length, direction and layer tension controlled for the 19-wire construction, and no joints are permitted in the finished outer layer, so the conductor remains round, the strands stay tightly closed after cutting, and there are no protruding wire ends to injure the lineman or to start a corona point. Finished conductors are tested and inspected before packing: strand diameter and lay check, overall diameter measurement, calculated and measured weight comparison, conductor D.C. resistance measurement, and a tensile test on the completed conductor to confirm the calculated breaking load. The plant works to ISO 9001:2015, ISO 14001 and OHSAS 18001:2007 with 100 % inspection before dispatch, and OEM or ODM drums, printing and private labelling can be arranged for distributor orders.

• 19/2.84 mm 6201 alloy stranding: 120.12 mm² calculated area with round, tightly closed layers.
• 52.5 % IACS conductivity: low line losses from a homogeneous all aluminium alloy construction.
• No steel core: no bimetal corrosion, no galvanic couple, ideal for coastal and polluted routes.
• Higher ampacity: typically 15 to 20 % more current than an ACSR of the same nominal size.
• Light weight, 331 kg/km: lower tower loading and easier handling on remote spans.
• Calculated breaking load 34.3 kN: predictable sag behaviour under ice and wind loading.
• Long service life: field records show more than sixty years in operation for AAAC lines.

Overhead transmission feeders and sub-transmission lines, primary and secondary distribution networks, rural electrification and long rural spans, river, basin and valley crossings where access for heavy plant is limited, coastal and industrial routes where ACSR would corrode rapidly, and line uprating projects where the existing towers must be reused. It is also used as bare busbar and jumper conductor in substations and switchyards, where a light, corrosion-resistant conductor simplifies support structures.

Conductor is supplied on wooden drums or wood-and-steel drums, with drum length, flange marking and labelling agreed at order stage; other packing can be arranged on request. Each drum is marked with model, size, stranding, length, standard and batch number, and shipments are accompanied by a packing list, inspection record and a routine test report covering conductor resistance, dimensions and breaking load. Third-party inspection and type test reports can be arranged where the contract requires them, and the factory accepts customer-specific technical requirements before production is released.