Ice Galloping

Dealing with Ice Galloping Ice galloping occurs for transmission and distribution lines in many argonas of the world. It occurs as the combined result of ice on the conductors and strong winds. While the resulting conductor questions are of relatively orotund premium, the main result of such motions is electrical not mechanistic failure. Once ice forms on the conductor it usually adheres for the law of continuation of the galloping motions until the wind eventually stops or the air temperature rises. interact techniques have been suggested including the use of drag devices, reduction in sag, and inter-phase spatial arrangement insulators. Davison of Ontario Hydro suggested the first effective means of control in 1939 [10]. He described the concept of providing sufficient phase-to-phase spacing when new lines are designed so that flashovers during galloping are prevented. Calculation of minimum authorization phase-to-phase spacing is done in terms of galloping ellipses bas ed on observation of ice galloping occurrences. Figure 1 - Ice Galloping ellipse for Phase Spacing Calculations [3] Other methods were developed in accompanying years. A second effective means of galloping control resulted from the studies of galloping at MIT under Richardson in the early 1960s.

This device, called the wind damper or drag damper, has been refined over the intervening years. A third effective means of control the detuning pendulum was developed at Ontario Hydro in the 1970s and became the object of an extensive field investigation by EPRI in the early 1980s. The effectiveness of this device is supported by a thorough statistical analy! sis of the field data. A fourth method of galloping control by means of both spoilers or VR conductor has also become available in juvenile years. Ice galloping motions occur at one of the ingrained unsloped string modes of the catenary usually the first, second, or third mode. The amplitude of motion associated with the single loop mode is of primary concern, because the...If you trust to amount a full essay, order it on our website: OrderCustomPaper.com

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