Invar Conductor/ Invar Conductors - ZTACIR


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Invar Conductors

These conductors use a combination of Aluminium Clad Invar (a special Fe-Ni alloy with very low thermal expansion coefficient) for the core, and super thermal resistant Al-Zr alloy for the conductive layer. This allows:

Invar conductors are especially suitable to replace ACSR conductors in short and middle spans lengths in all the orographic conditions (plain, hill or mountains).

 


 

Specification EXAMPLE - Other Designs According to Customers' Requirements

Super Thermal Resistant Aluminium Alloy Conductor Invar Reinforced
ZTACIR Ø 19,04mm (7 + 30)
ACI 20SA core + IEC 62004 AT3 aluminium alloy (ZTAL)
CONDUCTOR PROPERTIES
Diameter [mm] 19,04
Formation Steel wires No. × Ø [mm] 7 × 2,72
AT3 wires No. × Ø [mm] 30 × 2,72
Section Steel wires [mm²] 40,7
AT3 wires [mm²] 174,3
Total [mm²] 215,0
Mass Steel wires [kg/km] 279
AT3 wires [kg/km] 482
Total [kg/km] 761
DC Resistance at 20°C [Ω/km] 0,1580
Rated Tensile Strength Core [kN] 40,27
Total [kN] 69,21
Modulus of Elasticity Core [GPa] 139
Total [GPa] 71
Coefficient of Linear Expansion Core [10-6/°C] 3,5
Total [10-6/°C] 15,8
Ampacity (IEC 1597) (210 °C) [A] 906
CORE PROPERTIES
Material Specification IEC 61232* ACI 20SA
Stress at 1% ext. [MPa] 990
Conductivity [%IACS] 16,9%
Formation No. × Ø [mm] 7 × 2,72
Dimension & tolerance Wires Ø [mm] 2,72 ± 0,03
Core diameter Ø OUT [mm] 8,16 ± 1%
Section Wires [mm²] 5,81
Total [mm²] 40,67
Mass Total steel [kg/km] 278,84
Central Wire Ø [mm] 2,72
1st Strand No. × Ø [mm] 6 × 2,72
Lay Ratio / Direction 19 / R.H.
Strand Increment % 0,606%
DC Resistance at 20°C [Ω/km] 2,5211
Greased NO
CONDUCTIVE LAYERS PROPERTIES
Material Specification IEC 62004 AT3 Al alloy (ZTAL)
Tensile Strength [MPa] 166
Conductivity [%IACS] 60,0%
Formation No. × Thick. [mm] 30 × 2,72
Dimension & Tolerance Wires Ø [mm] 2,72 ± 0,03
Inner Diameter Ø IN [mm] 8,16 ± 1%
Outer Diameter Ø OUT [mm] 19,04 ± 1%
Section Wires (1st Strand) [mm²] 69,73
Wires (2nd Strand) [mm²] 104,59
Total [mm²] 174,32
Mass Total Steel [kg/km] 481,85
1st Strand No. × Ø [mm] 12 × 2,72
Lay ratio / Direction 14 / R.H.
Strand Increment % 1,599%
2nd Strand No. × Ø [mm] 18 × 2,72
Lay Ratio / Direction 11,5 / R.H.
Strand Increment % 2,705%
DC Resistance at 20°C [Ω/km] 0,1686
Greased NO
Emissivity Treatment NO

In accordance with EN 50182, IEC 62004, IEC 61232* (*only for Aluminium cladding)

In case the numerical value in this specification example and the international standard value are different, the numerical value in this example has priority.

Ambient temperature 20°C: Wind speed 0,60m/s – Emissivity ε=0,5 – Absorptivity α=0,5 – Intensity of solar radiation 900W/m²
Ambient temperature 30°C: Wind speed 0,60m/s – Emissivity ε=0,5 – Absorptivity α=0,5 – Intensity of solar radiation 900W/m²
Ambient temperature 40°C: Wind speed 0,60m/s – Emissivity ε=0,5 – Absorptivity α=0,5 – Intensity of solar radiation 900W/m²
Conductor Temperature
[°C]
Resistivity
[Ω/km]
Ampacity [A]
20°C30°C40°C
300,1644186  
400,1707340180 
500,1771436331174
600,1834509425323
700,1897567497416
800,1960617555486
900,2024660604544
1000,2087697647593
1100,2150731685636
1200,2213762719674
1300,2277790750708
1400,2340815778739
1500,2403839804768
1600,2466862829794
1700,2530883851819
1800,2593903873842
1900,2656922894865
2000,2719940913886
2100,2783958932906