Description

Technical Parameters

Hebei Hualun Cable Co., Ltd. is one of the most reliable manufacturers and suppliers of stacir conductor in China. If you're going to wholesale durable stacir conductor made in China, welcome to get quotation from our factory. All customized products are with high quality and competitive price.

STACIR conductor has outer layers composed of Super Thermal Aluminium (STAL) alloy wires that can operate up to 210°C (410°F). The inner core is composed of aluminium clad INVAR wires. INVAR is a metal alloy with 36% Ni in steel. STACIR/AW conductors are suited for re-conductoring applications. The capacity of an existing transmission line can be enhanced by simply replacing the existing conductor without any modification to the tower. Hi-STACIR/AW, STACIR/AW is normally used to up-rate an existing transmission line by simply replacing the existing conductor without tower modification or reinforcement. Core wire is aluminum-clad INVAR wire or high tensile strength aluminum-clad INVAR wire. Conductor is Super Thermal Resistant Aluminum Alloy Wire used for continuously allowable temperature up to 210°C.

Product Parameters

Item	Parameter
Product structure	Outer layers of Super Thermal Aluminium alloy wires, inner core of aluminium clad INVAR wires
Outer layer material	Super Thermal Aluminium (STAL) alloy wires
Outer layer operating temperature	Up to 210°C (410°F)
Core wire material	Aluminum-clad INVAR wire / High Tensile Strength Aluminum-clad INVAR wire
INVAR composition	Metal alloy with 36% Ni in steel
Continuous allowable temperature	Up to 210°C
Application	Re-conductoring, up-rating existing transmission lines

Performance Characteristics

Outer layers of Super Thermal Aluminium alloy wires can operate up to 210°C (410°F)
Inner core is aluminium clad INVAR wires, INVAR contains 36% Ni in steel
Can carry 100% more current than that of ACSR of the same size
Maximum sag and maximum working tension remain the same as that of ACSR
No modification or reinforcement is required to existing towers for uprating transmission and distribution lines
Suited for re-conductoring applications by simply replacing the existing conductor

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Product Q&A

Q: Does the INVAR core wire of STACIR conductor require special treatment before crimping?

A: Yes. The mechanical properties of INVAR alloy (a steel alloy containing 36% Ni) differ from ordinary galvanized steel cores. Steel core crimp sleeves and dies matched to aluminum-clad INVAR wire should be used during crimping. Remove the surface oxide film from the core wire before crimping, and check the aluminum cladding for integrity and cracks after crimping.

Q: What is the sag behavior of this conductor after reaching the "knee point" temperature during operation?

A: The knee point temperature is typically between 80 and 100°C. Before reaching the knee point, the aluminum layers and the INVAR core share the load, and both are affected by thermal expansion. Above the knee point, tension is borne primarily by the INVAR core alone. Its coefficient of linear expansion is extremely low (≤3.7×10⁻⁶/℃), so the sag remains essentially stable as temperature rises. This is the core mechanism by which STACIR achieves low sag.

Q: When this conductor is used for capacity upgrading of an existing line, do the fittings or spacers need to be adjusted after replacing the conductor?

A: The tower or main fitting structure does not need to be replaced. STACIR conductor uses the same installation techniques as ACSR, and existing fittings and crimping tools can be used. However, after conductor replacement, the sag should be rechecked according to the design tension to confirm whether the ground clearance requirements are met.

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STACIR Conductor

Product Parameters

Performance Characteristics

Product Q&A