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Double Pendulum Anti-Galloping Device – Accept Customization SHB-500/630-680
Product Overview
The Double Pendulum Anti-Galloping Device is a specialized protective fitting engineered for overhead transmission lines, designed to suppress galloping—a low-frequency, large-amplitude, self-excited oscillation of conductors caused by wind acting on asymmetrically iced conductors. Galloping can result in flashovers, hardware and insulator damage, broken strands or conductors, and even tower collapse.
Based on the stability anti-galloping mechanism, this device improves the dynamic stability of the conductor system and has become one of the most widely used anti-galloping devices in China's overhead transmission lines. It is equally effective for both AC and DC overhead transmission lines.
Design & Construction
The Double Pendulum Anti-Galloping Device features an integrated structural design that combines two types of pendulum absorbers into a single, unified unit:
| Component | Description |
|---|---|
| Conductor Clamps | Securely attach to the sub-conductors; the number of clamps matches the number of conductors in the bundle |
| Ring Isolation Plate | Evenly distributes the clamps around the conductor bundle via small bolts |
| Short Connecting Rods | Two rods extend downward from the ring at an angle α, with their symmetrical axis passing through the ring's center |
| Resonance Pendulum Absorber | Connected to the lower ends of the connecting rods, it swings around the center of the split conductor to absorb vibration energy |
| Parametric Excitation Pendulum Absorber | Works in conjunction with the resonance absorber to form the complete double-pendulum system |
Working Principle
When wind causes ice-covered conductors to gallop, the double pendulum structure absorbs vibrational energy from the conductors and converts it into the swinging motion of the pendulums.
The key innovation is the integration of two absorber types:
- Resonance Pendulum Absorber – tuned to the conductor's natural vibration frequency to absorb primary vibrational energy
- Parametric Excitation Pendulum Absorber – addresses parametric excitations and high-frequency vibrations
Working together, these two components provide simultaneous damping of horizontal, vertical, and inclined vibrations. This design changes the torsional inertia parameters of the conductor system, making the system more stable and preventing galloping from occurring.
Key Features & Advantages
Technical Specifications & Applications
Technical Specifications
The Double Pendulum Anti-Galloping Device is available in configurations for various split-conductor arrangements, including four-split and six-split bundles. It is applicable for transmission lines up to 500kV and below.
Specifications are for reference; customized models and sizes are available upon request.
Applications
- Overhead Transmission Lines – suitable for both AC and DC systems
- Split-Conductor Lines – four-split, six-split, and other arrangements
- Voltage Levels up to 500kV and below
- Lines Prone to Galloping – regions with frequent ice and wind
- Compact Transmission Lines and Double-Circuit Multi-Return Lines
Customization Services (OEM/ODM)
We offer full customization services to meet unique project requirements:
- Conductor Configurations – tailored for any split-conductor bundle
- Conductor Diameters – customized clamping ranges
- Pendulum Parameters – optimized length and mass based on span conditions
- Materials – choice of materials for specific environments
- Branding – custom packaging and logo printing available
Quality Assurance
All Double Pendulum Anti-Galloping Devices are manufactured in compliance with DL/T 2969-2025 – the industry technical specification for anti-galloping devices used in overhead transmission lines. Products undergo rigorous testing for mechanical strength, dynamic performance, and environmental durability.
For more information, technical specifications, or to request a quotation, please contact us. We look forward to establishing a long-term and mutually beneficial partnership with you.
