Tungsten Copper High Voltage Contact
1. What's Tungsten Copper High Voltage Contact?
Tungsten copper high voltage contact is functional component engineered to withstand electrical arc action in high-voltage switchgear, typically operating as arcing contact or contact insert. CTIA's tungsten copper high voltage contact is manufactured using powder metallurgy infiltration process, where tungsten forms high-temperature resistant matrix, while copper provides electrical and thermal conduction channels, balancing arc erosion resistance with current transmission and heat dissipation requirements. High-voltage circuit breaker arcing contacts serve a different function from main contacts. In certain designs, the main contacts separate first during opening, transferring the arc to the arcing contacts before the arc-extinguishing system interrupts the current, reducing arc damage to the main contacts.
2. Characteristics of CTIA's Tungsten Copper High Voltage Contact
(1) High-Temperature Arc Erosion Resistance: Tungsten features high melting point and high-temperature thermal stability, minimizing contact melting, material loss, and surface degradation under arcing conditions.
(2) Superior Welding Resistance: Tungsten matrix limits local molten metal flow, working alongside optimized contact geometry and material ratios to reduce contact welding risk.
(3) Excellent Electrical and Thermal Conductivity: The copper phase provides pathways for electrical conduction and heat transfer, helping reduce resistive losses and dissipate localized heat.
(4) Stable Thermal Performance: Tungsten copper combines relatively low coefficient of thermal expansion with good high-temperature stability, helping minimize dimensional and structural changes caused by temperature fluctuations during repeated current interruption.
(5) Comprehensive Interruption Life Evaluation: High-voltage contact performance relies not only on electrical conductivity and hardness, but also on rated breaking current, arcing time, mass ablation rate, and continuous switching endurance under specified operating conditions.
3. Applications of CTIA's Tungsten Copper High Voltage Contact
(1) High- and Extra-High-Voltage Circuit Breakers: Used for moving and fixed arcing contacts, tungsten copper provides excellent resistance to arc erosion, helping reduce contact wear during current interruption.
(2) SF₆ Circuit Breakers: Used in circuit breakers rated at 110 kV and above. CuW70–CuW80 compositions are commonly used to withstand intense arc exposure in SF₆ gas.
(3) Vacuum Circuit Breakers: Used for contacts in vacuum interrupters, where excellent resistance to contact welding is required. High-tungsten grades such as CuW90 are commonly used to improve interruption reliability.
(4) Transformer On-Load Tap Changers: Used for switching contacts or arcing contacts. Higher tungsten content improves arc erosion resistance, while higher copper content helps maintain lower contact resistance.
(5) High-Voltage Load Switches: Used as arcing contacts in high-voltage load switches, providing resistance to arc exposure during load interruption.
4. Specifications of CTIA's Tungsten Copper High Voltage Contact
(1) Common Materials: CuW70, CuW75, CuW80, CuW85, CuW90, etc.
(2) Product Shapes: Cylinders, rings, arcing contact inserts, and custom-shaped contact assemblies.
(3) Dimensions and Tolerances: Customizable.
CTIA GROUP has nearly 30 years of experience in tungsten copper alloy manufacturing, with expertise in powder metallurgy and precision machining. CTIA selects suitable tungsten-to-copper ratios, designs contact structures, and precision-machines components to meet specific interruption conditions, dimensional requirements, and assembly tolerances.
For any inquiry, please contact tungsten copper manufacturer: CTIA GROUP
Email: sales@chinatungsten.com
Tel: 0086 592 5129696 / 0086 592 5129595
Website: tungsten-copper.com
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