PacifiCorp gets a grip on galloping conductors: on-line devices tame wind- and ice-induced conductor movement

摘要

The most dramatic illustration of conductor movement is the violent shift of conductors during galloping. In this scenario, conductors in one span achieve an inverted sag as they reach their maximum upward excursion while adjacent spans retain their original catenaries. Moments later, the spans alternate their movement as conductors swing in the opposite direction. At any time, the line looks like a sine wave as it achieves a full double-amplitude gallop. This event subjects structures to unusual and potentially damaging forces. The control of galloping has long eluded the research efforts of engineers. Recently, Research Consulting Associates (Lexington, Massachusetts, U.S.) developed a family of devices to prevent the galloping phenomenon.