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AT3S Heat-resistant
Bare conductors GOST 839-2019

AT3S

New-generation heat-resistant steel-reinforced aluminium conductor

AT3S / AT3SP are new-generation heat-resistant conductors for overhead lines with increased current-carrying capacity. The outer layers are made of a heat-resistant aluminium-zirconium alloy (Al-Zr) that withstands continuous heating up to +210°C and up to +240°C in emergency mode (vs +70°C for standard AS). This makes it possible to increase the transmitted current without replacing towers and fittings. Service life is 45 years. Designation breakdown: AT3S – heat-resistant aluminium of type 3 with a steel core, AT3SP – the same with shaped (trapezoidal) wires.

Conductor Al-Zr alloy + steel
Continuous t° +210°C / +240°C (AT3S)
Service life 45 years
Advantage +30-40% current vs AS
Request a price Size table

AT3S PRODUCT RANGE

Sizes with actual technical specifications.

ConductorCross-section Al/steelDiameter, mmWeight, kg/kmStrength, NDC resistance, Ω/kmContinuous t°
AS 300/39300/3924.0113288 7600.0958+70°C
AT3S 300/39300/3924.01132104 8780.0970+210°C
AT3SP 300/39300/3921.51121103 0620.0985+210°C
AS 500/64500/6430.61852145 4400.0600+70°C
AT3S 500/64500/6430.61852173 3760.0597+210°C
AT3SP 500/64500/6427.71885175 2720.0587+210°C
Data are given for standard cross-sections per GOST 839-2019 (for A, AS, M, MG) or from the official TCG catalogue (AT3S, AERO-Z, see PDF pp. 28-30). Intermediate and non-standard cross-sections can be manufactured to special order.

AT series conductor description

AT conductors (AT1S, AT1SP, AT3S, AT3SP) are new-generation heat-resistant steel-reinforced aluminium conductors (ACSR). The outer layers are made not of ordinary A5E aluminium but of a special heat-resistant aluminium-zirconium alloy (Al-Zr). This allows the conductor to operate continuously at +150°C (AT1S) or +210°C (AT3S) without loss of strength or elongation – compared with +70°C for standard AS.

Main advantages vs AS:

  • Increased current-carrying capacity (+30-40%) with the same dimensions
  • Higher tensile strength (+15-20%)
  • AT3SP – reduced diameter for the same cross-sectional area thanks to shaped wires
  • Stable construction with reduced susceptibility to wind and ice load
  • Service life of 45 years (vs 30 for AS)

Used for the reconstruction of existing overhead lines to increase their capacity without replacing the towers. Particularly effective in areas where the construction of new routes is restricted – the route stays the same, while the transmission capacity almost doubles.

Applications

Reconstruction of existing overhead lines to increase transmission capacity
35-500 kV trunk overhead lines with growing load
Lines in areas where new construction (routes) is restricted
Replacement of AS in areas with growing power consumption
Reduction in the number of towers thanks to higher strength

Construction

1

Steel core

Stranded galvanised steel wires. Carries the mechanical load.

2

Outer layers

Made of a heat-resistant aluminium-zirconium alloy (Al-Zr). Withstand continuous heating up to +210°C (AT3S) or +240°C (in emergency mode). AT3SP has shaped (trapezoidal) wires to reduce the outer diameter.

AT3S cross-section – steel core + layers of heat-resistant Al-Zr alloy

Technical specifications

Conductor material Aluminium-zirconium alloy (Al-Zr)
Core material Galvanised steel
Cross-sections 70/11 ... 800/57 mm² (Al/steel)
Continuous t° (AT3S) +210°C
Overload t° +240°C
Service life 45 years
Advantage +30-40% continuous current-carrying capacity vs AS
Standard TCG TS / EN 50183

Detailed specifications – see the TCG datasheet

Operating conditions

Installation temperature not below -20°C
Operating temperature -60°C … +50°C
Max. conductor t° (continuous) +210°C
Air humidity up to 98% at +35°C
Operating atmosphere types II, III (GOST 15150)
Service life 30+ years (standard), 45 years (AT series and AERO-Z)
Warranty 5 years
Climatic category UHL

DOCUMENTS

TCG product catalogue PDF, 31 MB
GOST 839-2019 PDF, 256 KB

REQUEST A PRICE

Specify the cross-section and quantity and we will prepare a proposal within 1 business day.

+998 (97) 748-80-00

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