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Protective Fitting

Your Professional Protective Fitting Manufacturer!

Yangzhou Skyee Smart Gird Technology Co.,Ltd. was established in 2001 and is headquartered in Shenzhen, China, our company pioneered the design and manufacturing of the first-generation preformed cable fittings production line, dedicated to producing preformed helical fittings. Our professional fields include R&D, production, sales and engineering support of optical fiber, optical cable and accessories, pre-twisted spiral fittings, power/communication/railway system fittings and high-voltage optoelectronic integrated products.

Why Choose Us

Product Application
Installation of ADSS/OPGW cables, Railway electrification infrastructure, Smart grids, and optical communication networks, alongside comprehensive protection solutions.

Production Equipment
Equipped with state-of-the-art facilities, our production lines cover:
1. Preformed wire processing (forming, grouping, adhesive coating, curing, sand coating, stranding, and bending).
2. Die-casting,
3. Stamping,
4. Forging,
5. Hot-dip galvanizing processes.

Production Market
State Grid Corporation of China, China Southern Power Grid, and exported to Southeast Asia, Africa, South America, North America and other markets.

Our service
We provide end-to-end services including system design, installation, maintenance and technical consulting for communications infrastructure and smart grid projects.

Types of Protective Fitting

The protective fitting produced by our company mainly include the following types:

Vibration Damper

A vibration damper (commonly known as a Stockbridge damper) is a critical protective fitting installed on conductors (or ground wires/OPGW) of overhead transmission and distribution lines. Its primary function is to suppress aeolian vibration-high-frequency, low-amplitude oscillations induced by wind (typically 3-100 Hz).

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Air Flow Spoiler

The Anti-Galloping Air Flow Spoiler is an aerodynamic vibration suppression device specifically designed for overhead transmission lines. It mitigates conductor galloping—a wind-induced oscillation phenomenon—by altering the airflow structure around the conductor. Its core mechanism involves disrupting uniform vortex shedding using specially shaped spoiler bodies, thereby reducing dynamic loads on the conductor. This prevents accidents such as line tripping, hardware fatigue, or conductor breakage caused by high-amplitude galloping.

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Advantages Of Vibration Damper

Energy Dissipation: Transfers conductor vibration energy to the weights, dissipating it through internal friction and aerodynamic drag.

Optimized Placement: Mounted at calculated "anti-node" positions (typically 0.5–4m from suspension points) for maximum effectiveness based on conductor type, tension, span, and wind data.

Sizing Variants: Weight and dimensions scale with conductor diameter, span length, tension, and local wind severity (e.g., larger dampers for EHV lines/long spans).

Corrosion Resistance: Hot-dip galvanizing or equivalent coating on all metallic parts for long-term outdoor durability.

Passive Operation: Requires no external power source.

Low Maintenance: Engineered for extended service life with minimal intervention (visual inspection recommended).

Application of Vibration Damper

Vibration dampers are essential for overhead lines in environments prone to wind-induced oscillation, including:
HV/EHV/UHV Transmission Lines: Standard protection for conductors ≥ 66kV, especially critical for large-diameter conductors under high tension.

Long Spans & Crossings: River/valley crossings, mountainous terrain, or spans > 400m where vibration amplitudes are highest. Often used with spiral vibration dampers or damping rods.

High-Risk Wind Zones: Coastal areas, plains, deserts, and other exposed regions with steady winds (0.5–10 m/s).

Distribution Lines (MV/LV): Applied to main feeder lines with long spans or significant vibration risk.

Ground Wires & OPGW

Installed on static wires and fiber-optic cables (OPGW, ADSS) to prevent vibration damage.

New Construction

Integral to line design per IEEE, IEC, or CIGRE standards.

Retrofit & Upgrades

Added to existing lines showing vibration fatigue or assessed as high-risk.

Advantages Of Air Flow Spoiler

Aerodynamic Design

Streamlined airfoil or helical geometry disrupts coherent vortex formation, minimizing lift fluctuations. Low wind-resistance profile avoids excessive additional load on conductors.

High-Efficiency Galloping Suppression

Generates turbulence to interfere with galloping's natural frequency, reducing amplitude by ≥60%. Effective under wind speeds of 5–25 m/s, including icing conditions.

Lightweight & Durable Construction

Materials: Aerospace-grade aluminum alloy or engineering polymers (UV-resistant, corrosion-proof). Modular design with 0.5–2 m segments, adaptable to various conductor diameters.

Easy Installation

Clamp-on or bolted fixation; requires no specialized tools or power outage. Zero structural modifications to existing lines; low maintenance cost.

Application of Air Flow Spoiler

HV/EHV Transmission Lines: Critical for 110kV+ lines in galloping-prone zones (e.g., wind corridors, plains), especially 500kV/UHV multi-bundle systems.

Icing-Risk Regions: Prevents low-frequency, large-amplitude galloping of ice-coated conductors (e.g., mountain/high-altitude grids).

Long-Span Crossings: Resolves aerodynamic instability in river/valley crossings with >800 m spans.

Compact Transmission Corridors: Prevents phase-to-phase flashovers in space-constrained urban/peri-urban areas.

Legacy Line Retrofitting: Replaces traditional dampers (e.g., stockbridge dampers), reducing tower load while enhancing safety.

Packaging and Shipping

1.Normal Package:Inner bag + carton
2.Specific packaging can be made to order.

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FAQ

Q: Can u provide us with samples?

A: Yes, we can provide 1-2 pieces free samples, But u should pay express cost or u provide us with express account number.

Q: If we need customized/OEM product,Can u supply?

A: Yes,Customized/OEM product/artwork is available for us.Professional designers,Advanced technicians and mold modifications department ensure that we will make the exact model for u accordingly.

Q: What payment terms available for u?

A: If order amount less than 10000USD,100% T/T;If amount more than 10000USD,30%T/T in advance plus 70%T/T before shipment.

Q: What is ur delivery time?

A: Normally, it will be shipped within two weeks after prepayment; if the order is large, it will take one month, depending on the order quantity.

Q: How does an Air Flow Spoiler prevent line galloping?

A: The spoiler’s central section maintains aerodynamic stability by creating a continuously changing profile against the wind, while helical gripping sections secure it to the cable. This design disrupts the formation of ice-induced aerodynamic lift that causes line galloping.

Q: What voltage ratings are available for Air Flow Spoilers?

A: Air Flow Spoilers come in standard versions for up to 230 kV applications and EHV versions for up to 345 kV. The EHV models feature a co-extruded semi-conductive material layer that minimizes radio interference and resists high electrical gradients.

Q: How many Air Flow Spoilers are needed per span?

A: Multiple spoilers are required per span, typically covering 25% of the span length. For example, a 600-foot span would need 13 Air Flow Spoilers, grouped in the middle 50% of the span with spaces between adjacent units.

Q: What are the temperature limitations for Air Flow Spoilers?

A: Air Flow Spoilers are rated for continuous operation at temperatures up to 125°C. High-temperature versions are available for specific applications requiring enhanced thermal performance.

Q: What is the working principle of Stockbridge damper?

A: The working principle of the Stockbridge damper is to transform the line vibration into the kinetic movement of the damper, then mitigating the transmission line vibration.

Q: What is the function of the spiral vibration damper?

A: Spiral vibration dampers limit and reduce the impact caused to fragile outdoor electrical structures from the motion produced during harsh weather. They also help to increase their long-term resilience.

As one of the most professional protective fitting manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to buy bulk protective fitting made in China here from our factory.

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