Measurement and control of conductor vibration

A method is outlined for determining the effectiveness of devices used for prevention of vibration fatigue in transmission conductors. Measuring equipment is described which provides records of conductor vibration in the quantitative form essential for such determinations. Vibration records obtained on typical constructions are analyzed and correlated with fatigue tests and operating experience to determine the probable life of the conductor. Data are given on the performance of test spans of a special loose-core A.C.S.R., as well as A.C.S.R. of standard stranding, for various span lengths, tensions, and equipped with various devices, including a double-suspension clamp, armor rods, Stockbridge dampers and a newly-developed torsional damper. Of the devices tested, dampers are shown to be most effective in reducing vibration stresses.