IEEE Std 1368:2006 pdf free download

IEEE Std 1368:2006 pdf free download.IEEE Guide for Aeolian Vibration Field Measurements of Overhead Conductors.
It should be noted that there are motives other than assessing risk of conductor fatigue for recording conductor vibration in the field. Some measurement programs are carried out to meet research and development objectives. Additionally, in some locations, access to specific sites required for betiding amplitude measurements is not possible. In those cases, parameters other than bending amplitude may best serve the needs of the program. This guide focuses on conductor fatigue, however, and therefore recommends the use of bending amplitude for field measurements to evaluate vibration performance.
2.2 Location for measuring bending amplitude
The USC of 9 mm (3.5 in) as the measurement location (Xh) was initiated by Tebo [1320]. The choice was influenced by the need to remain close enough to the clamp that the shape of the conductor was governed by stiffness effects alone, and not by inertial forces due to the conductor’s acceleration in the vibration loops. However, it was necessary to sense the bending far enough from the clamp to find displacements large enough to be measured accurately. Tebo’s initial choice was adopted in subsequent work in order to facilitate comparison of test results with measurements from earlier programs, and its continued use is recommended in this guide for the same reason. The distance from the last point of contact between the conductor and the metallic suspension clamp is referred to as the “lever arm” (IEEE Transmission and Distribution Committee [B15]).
2.3 Assessing the risk of fatigue through measurements of bending amplitude
Subsequent to publication of the IEEE Transmission and Distribution report [HIS], two developments occurred that strengthened the basis for assessing the risk of fatigue through measurements of bending amplitude.
2.3.1 Poffenberger-Swart formula for calculation of strain from bending amplitude data
In l%5, Poffenberger and Swan [1317] presented an analysis of bending at clamps that permitted calculation of bending strain at the conductor surface from bending amplitude. Good correlation between calculation and laboratory measurement was found for a significant sampling of conductor sizes. The correlation between bending amplitude and strain at thc surface, which previously had been demonstrated only for individual conductors, could now be applied for all conductors using the Poffenberger-Swart formula.
The peak alternating strain at the surface of the conductor at the clamp is predicted by the PoffenbergerSwan formula, shown in Equation (I), Equation (2). and Equation (3) as follows.