INVAR
Aluminum-clad steel core heat-resistant aluminum alloy conductor is a kind of double-capacity conductor made by twisting aluminum-clad steel core and heat-resistant aluminum alloy wire together.
International Standard: IEC 62004
Structural features: Aluminum-clad steel core structure
Advantages
1.Good temperature stability
2.Ultra-high current-carrying capacity
3.Long life
4.Strong environmental adaptability
INVAR Data Sheet
| Type of conductor | 410mm2 Hi-STACIR/VAR | |||
| Maker/Country of origin | China | |||
| Standard | T-CEEIA 431-2020
T-CEEIA 429-2020 IEC62004 |
|||
| Structure diagram |  |
|||
| The appearance and surface quality | Stranded wire surface with no visible defects, without any defects that do not match the requirements | |||
| Stranding and diameter of wire | STAL | pcs/mm | 26/4.5 | |
| LBY | pcs/mm | 7/3.5 | ||
| Calculated cross-sectional area | Total area | mm2 | 480.8 | |
| STAL | mm2 | 413.5 | ||
| LBY | mm2 | 67.3 | ||
| Overall diameter | mm | 28.5 | ||
| Unit weight of conductor(without grease) | kg/km | 1641.71 | ||
| DC Resistance at 20℃ | Ω/km | 0.0691 | ||
| Rated Strength | kN | 130.35 | ||
| Elasticity module | up to Transition temp. | GPa | 69.7 | |
| above transition temp. | GPa | 160.0 | ||
| thermal expansion coefficient | up to Transition temp. | 1/℃ | 16.6*10-6 | |
| above transition temp. | 1/℃ | 3.0*10-6 | ||
| Permissible operating temperature | ℃ | 210 | ||
| Conductor allows short – term operating
temperature（400h） |
℃ | 240 | ||
| Ampacity （210℃） | A | 1600 | ||
| Lay ratio | Aluminum clad Invar core layer | / | 16～26 | |
| STAL inner layer | / | 10～16 | ||
| STAL outer layer | / | 10～14 | ||
| For strands with multiple layers | / | The ratio of pitch diameter of any layer shall not be greater than that of the adjacent inner layer | ||
| direction of
lay |
Outer layer | / | Right hand | |
| Other layers | / | Adjacent layers should be twisted opposite | ||
technology parameter table of Ф4.5 STAL single wire
| The appearance and surface quality | Stranded wire surface with no visible defects, without any defects that do not match the requirements | ||
| Overall diameter | mm | 4.5 | |
| Allowable deviation of the diameter | ﹢ | mm | 0.045 |
| ﹣ | mm | 0.045 | |
| Dc resistance of 20 ℃ | nΩ·m | ≤28.735 | |
| Tensile Strength | Before stranding | MPa | ≥159 |
| After stranding | MPa | ≥151 | |
| elongation | % | ≥2.0 | |
| Calculated cross-sectional area | mm2 | 15.90 | |
| Mass per unit length | kg/km | 42.99 | |
| Winding | / | 1D*8 turns, the alloy wire will not break | |
| Strength survival rate | 280℃,1h,The tensile strength is not less than 90% | ||
technology parameter table of Ф3.5 Aluminum clad Invar wire single wire
| The appearance and surface quality | Stranded wire surface with no visible defects, without any defects that do not match the requirements | ||
| Overall diameter | mm | 3.5 | |
| Allowable deviation of the diameter | ﹢ | mm | 0.05 |
| ﹣ | mm | 0.05 | |
| Tensile Strength | Before stranding | MPa | ≥1100 |
| After stranding | MPa | ≥1045 | |
| Elongation after breaking (250mm) | ％ | ≥0.8 | |
| Twist (L=100d) | No/360° | ≥20 | |
| DC Resistance at 20℃ | nΩ·m | ≤172.41 | |
| Conductivity | ％IACS | ≥10 | |
| Minimum aluminum layer thickness | mm | ≥0.088 | |
| Calculated cross-sectional area | mm2 | 9.62 | |
| Mass per unit length | kg/km | 71.10 | |
Get Free Quote of INVAR
Applications
1.High-temperature and large-capacity power transmission
2.Capacity expansion and renovation of old lines
3.Power transmission in special environments (Desert areas, Chemical industrial zones)
