Galloping Reduction of Transmission Lines by Using Phononic Crystal

Abstract

Considering the combination of the transmission lines and phononic crystals (PCs), we propose a new method to solve the problem of the galloping of overhead transmission lines. The method has two key points: attaching the suitable mass-spring system on each spacer, and periodically arranging the modified spacers along a transmission line. Based on the Bloch's theorem, the PC transmission lines could generate vibration band gaps (BGs), which would reduce galloping. In order to implement our point, we establish the two-dimensional model of the PC transmission lines and derive the transfer matrix method to calculate the frequency dispersion relation of the vertical transverse vibration. Then, the extremely low frequency BG, in the range of galloping frequency, is obtained and verified based on an example of single conductor. To widen the BG range, we also study the effects of the spacer and the attached mass-spring system on the BG. The wide BG, which even covers the range of 0.338-0.909 Hz, could be given just by using the suitable setting of the spacer and mass-spring system.

Research on transmission line dance monitoring and early warning system by fusing multi inertial sensors

“…Literature [19] established partial differential control equations to characterize ice-covered transmission line dances and reduce transmission line dance accidents by performing a multimodal dance study on an ice transmission line with thin ice accretion. Literature [20] combines transmission lines and acoustic link crystals to propose a new method to solve the problem of overhead transmission lines, establishes a two-dimensional model of PC transmission lines, calculates the frequency dispersion relation of vertical transverse vibration, and reduces transmission line dancing by using phononic crystals.…”

The Structure of the Near-Surface Layer of the AAAC Overhead Power Line Wires after Operation and Its Effect on Their Elastic, Microplastic, and Electroresistance Properties

“…During operation in an open-air atmosphere, wires in cables of overhead power lines are subjected to various influences, such as Aeolian vibration, sub-span oscillation, galloping, and swaying due to wind, tension, atmospheric corrosion, icing, moisture, fretting wear between wires, strong electromagnetic field, possible lightning strikes, and so on [8,[14][15][16][17]. As a result of these external influences, changes occur in both the structure and microstructure of not only Al of the outer surface layers, but also the inner material of the wires of the cable cores [18][19][20].…”