Cross-Rope Transmission Tower-Line Dynamic Analysis

An investigation of the dynamic behavior of a cross-rope-suspension system (CRSS) electrical transmission line structure is presented. Experimental and theoretical studies, which included both modal and forced-response analyses, were performed. An analysis of the techniques employed and a comparison of results is included. The most important result is that the conductor modes appear to add destructively at low frequencies so that the coupling supplied by the cross-ropes is unimportant in this range. However, at higher frequencies the dynamic response coupling between the conductor phases is larger and there may be a greater tendency for the system to vibrate in the "subconductor-oscillation" range. It is shown that good interaction between the development of the theoretical model and the experimental analysis and the desirability of having a theoretical analysis before the test are important.