Abstract
The Stockbridge damper (tuned mass absorber) is used on overhead transmission power lines to suppress wind-induced vibrations. These power lines get exposed to various types of wind motions that cause them to vibrate and this causes fatigue failure at the suspension clamp where the maximum stress occurs. Aeolian vibration is the most common wind motion that causes fatigue and eventually, failure to transmission lines. This paper presents the study of an asymmetric Stockbridge damper. A set of experiments were conducted on the damper according to the Institute of Electrical and Electronics Engineers (IEEE) 664 standards to evaluate the characteristics of the asymmetric Stockbridge damper. The results obtained revealed that the asymmetric damper is four degrees of freedom. The results also revealed a relationship between the mass and the magnitude of the resonance frequency.
Highlights
Overhead power transmission lines get exposed to wind motions that cause them to vibrate
The asymmetric Stockbridge damper is not clamped on the power transmission line, it is mounted on the shaker shown in Fig. 8 to represent the transmission line exposed to Aeolian vibration
The experiments were successfully conducted on different sizes of asymmetric Stockbridge dampers
Summary
Overhead power transmission lines get exposed to wind motions that cause them to vibrate. Wind motions cause vortex shedding and eventually leads to a fatigue failure, usually at the suspension clamp where the most significant stresses of the power lines occur [1]. This phenomenon leads to a power outage. It is characterised by a frequency ranging from 3 to 150 Hz produced by a wind speed of 1 m/s to 7 m/s [4]
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