Line Fittings | FR Series Corona-Free Stockbridge Vibration Damper for EHV/UHV Lines is a specialized corona-free and low-RIV (Radio Interference Voltage) Stockbridge vibration damper engineered for 220kV, 330kV, 500kV, 750kV and 1000kV extra-high-voltage (EHV) and ultra-high-voltage (UHV) overhead transmission lines. Features aerodynamically rounded, smooth-profile weights and an enclosed anti-corona clamp body that suppresses electrical corona discharge and audible noise under intense high-voltage electric fields.
Aerodynamically induced aeolian vibration represents one of the primary causes of conductor fatigue breakage, loose fittings, and hardware damage on overhead power lines. By converting high-frequency mechanical vibration energy into internal frictional and bending heat dissipation across the flexible steel messenger wire, our vibration dampers dramatically suppress line vibration amplitudes, safeguarding overhead conductors, optical ground wires (OPGW), and tower attachment hardware over multi-decade service lifetimes.
Key Design & Performance Highlights:
- Material & Construction: Aerodynamically smooth-profile hot-dip galvanized cast steel weights (polished surface), high-flexibility pre-stretched damping steel messenger wire, and high-purity smooth aluminium alloy clamp with embedded shielded fastening bolts.
- Broadband Damping Performance: Tuned resonance characteristics maximize dynamic energy dissipation across critical high-frequency aeolian vibration modes, reducing conductor bending strain well below international safe endurance limits (< 150 µε).
- High Fatigue Life: Messenger cable strands undergo specialized pre-stretching and dynamic fatigue testing exceeding 10 million vibration cycles without strand breakage.
- Corrosion Protection: Heavy-duty hot-dip galvanization conforming to ASTM A153 / ISO 1461 and high-grade corrosion-resistant aluminium alloys deliver superior longevity in harsh industrial, coastal, and high-humidity environments.
- Industry Approvals & Standards: Manufactured in full compliance with GB/T 2338, DL/T 757, IEC 61897, CISPR 18; ISO 9001 certified production with complete mechanical, dynamic resonance, and fatigue test reports.
