Product Overview
Transmission Line Vibration Damper, also widely known as Stockbridge Vibration Damper, is passive protective fitting specially designed for overhead transmission and distribution lines. When overhead wires are continuously impacted by low‑speed crosswind, aeolian vibration will occur at high‑frequency small amplitude. Long‑term cyclic vibration will generate alternating stress at wire clamp position, gradually leading to metal fatigue, strand fracture and even conductor broken accident, bringing huge hidden danger to grid safe‑operation
This damper device is installed on outer side of suspension / tension wire‑clamp. Through energy‑consuming structural design, it counteracts part vibration amplitude transmitted from conductors. FD series adopts symmetrical cylindrical‑hammer layout for conventional general‑purpose scenarios. FR series applies asymmetric dog‑bone hammer structure for wide‑frequency vibration suppression. This hardware is extensively sourced by international EPC contractors, power utility operators and power‑fitting distributors. It should be noted that this product only aims at aeolian micro‑vibration suppression; it cannot eliminate large‑amplitude galloping induced by gale. Improper installation position or wrong model selection will greatly weaken vibration‑reduction effect
Working Principle
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The core energy‑consuming component of vibration damper is pre‑formed high‑strength galvanized steel strand connected between hammer weights and aluminum alloy clamp body. When overhead conductor generates aeolian vibration, vibration signal will transfer to damper clamp, driving two counterweights to swing up and down. Internal friction between steel‑strand single wires consumes vibration mechanical energy, lowering vibration amplitude of original conductor
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Symmetrical FD type forms single resonance frequency response. It works well within fixed vibration frequency band. Asymmetric FR dog‑bone damper owns two groups of counterweights with different mass, producing two different resonant frequencies, expanding valid damping frequency range, adapting to complicated wind‑speed conditions of large‑span transmission lines. The damper does not eliminate vibration completely, but reduces vibration amplitude down to safe threshold value to protect conductor from fatigue damage
Features & Advantages
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Rational energy‑dissipating steel‑strand pressing‑joint craft, stable friction‑energy‑consumption effect, long anti‑fatigue service‑life.
Aluminum‑alloy wire‑clamp inner‑groove fits conductor outer‑curve well, reliable clamping force without damaging ACSR conductor strands.
Complete anti‑corrosion treatment for all metal components, adaptable for inland plain, coastal salt‑spray atmospheric environment.
Two structural options: FD model with high cost‑performance for general distribution‑line; FR dog‑bone type for wide‑frequency damping for large‑span transmission‑line.
Strict sampling vibration‑fatigue test for each production batch, damping performance traceable.
High interchangeability, compatible with mainstream overhead‑line hardware on international market, no secondary modification required during field installation.
Case1:
Overseas rural distribution‑network upgrade project. Mass FD‑series vibration dampers are deployed for medium‑and‑short‑span overhead lines. After multi‑year field operation, no conductor strand‑breakage fault caused by aeolian vibration was reported.
Case2:
Cross‑mountain transmission‑line supporting project for overseas new‑energy base. FR‑series dog‑bone vibration dampers are selected for large‑span towers. Dual‑frequency damping structure copes with complex mountain wind‑speed variation, lowering fatigue risk of long‑distance overhead conductors
Application Scenarios & Cases
This product applies to 10kV‑220kV overhead transmission & distribution lines, matching ACSR conductor and overhead earth‑wire. It is widely adopted for new‑built power‑grid construction, aging‑line renovation, overhead outgoing circuit of photovoltaic and wind‑power stations. It fits mountainous, hilly and coastal regions where aeolian vibration frequently occurs. Not suitable for suppressing large‑amplitude conductor galloping under gale condition.
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