Product Description
APAR’s STACIR (Super Thermal Resistant Aluminium Alloy Conductor, Aluminium Clad Invar Reinforced) and STACIR/TW conductors are advanced High Temperature Low Sag (HTLS) conductors designed to significantly enhance transmission capacity while utilizing existing transmission infrastructure.
The conductor features an Aluminium Clad Invar Steel (Fe-Ni Alloy) core surrounded by Super Thermal Resistant Aluminium-Zirconium (AT3) alloy wires. This advanced construction combines exceptional thermal stability, low thermal expansion, high conductivity, and superior mechanical strength, making STACIR an ideal solution for transmission line uprating, renewable energy integration, and grid modernization projects.
Capable of operating at temperatures up to 210°C, STACIR conductors can carry substantially higher current than conventional ACSR conductors while maintaining lower sag and requiring minimal infrastructure modifications.
Key Advantages
- Continuous operating temperature capability up to 210°C
- Up to 100-150% higher current carrying capacity compared to equivalent ACSR conductors
- Exceptionally low sag due to Aluminium Clad Invar reinforced core
- Increased transmission capacity without constructing new lines
- Minimal or no tower reinforcement required for line uprating projects
- Excellent thermal and mechanical stability
- Excellent corrosion resistance and long service life
- Available in both round wire and trapezoidal wire configurations
- Optimized for congested transmission corridors and urban networks
- Supports grid modernization and renewable energy integration
Available Variants
APAR offers:
- STACIR (Round Wire Construction)
- STACIR/TW (Trapezoidal Wire Construction)
- Customized conductor sizes and configurations available upon request
The STACIR/TW variant utilizes trapezoidal aluminium alloy strands to maximize aluminium content and improve conductor efficiency and ampacity.
Applications
- Transmission line uprating projects
- High Temperature Low Sag (HTLS) transmission systems
- Renewable energy evacuation networks
- Utility grid modernization programs
- Long-span transmission crossings
- Congested transmission corridors
- Urban and metropolitan transmission systems
- High-capacity power transmission networks
- Substation interconnections
- Utility and EPC transmission projects
Standards & Quality
APAR’s STACIR conductors are manufactured in compliance with relevant international standards and utility specifications to ensure superior electrical, thermal, and mechanical performance.
Each conductor is manufactured through very stringent quality standards, with rigorous testing at every stage including type testing and validation.
Construction & Material
STACIR conductors consist of Super Thermal Resistant Aluminium-Zirconium (AT3) alloy wires concentrically stranded over an Aluminium Clad Invar Steel core.
The Aluminium Clad Invar Steel core provides exceptional mechanical strength and extremely low thermal expansion characteristics, while the outer AT3 alloy strands enable continuous operation at elevated temperatures without significant loss of mechanical properties.
The conductor is available in both conventional round wire and compact trapezoidal wire (TW) constructions to optimize current carrying capacity and transmission efficiency.
APAR’s Design & Manufacturing Expertise
With decades of expertise in advanced conductor technologies and transmission infrastructure solutions, APAR develops and manufactures high-performance HTLS conductors that meet the evolving needs of utilities and grid operators worldwide.
Our manufacturing capabilities ensure:
- Advanced Aluminium-Zirconium alloy processing
- Consistent thermal and mechanical performance
- Superior conductor geometry and strand quality
- Rigorous testing and quality assurance
- Compliance with global utility standards
APAR’s STACIR conductors enable utilities to increase transmission capacity, improve network reliability, and optimize existing infrastructure without extensive capital investment in new transmission corridors.