Ice Galloping

Dealing with Ice Galloping Ice galloping occurs for transmission and distribution lines in many beas 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 large amplitude, the main result of such motions is electrical not mechanical failure. Once ice forms on the conductor it usually adheres for the subsequence of the galloping motions until the wind eventually stops or the air temperature rises. miscellaneous techniques have been suggested including the use of drag devices, reduction in sag, and inter-phase spacing 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 mandatary phase-to-phase spacing is done in terms of galloping ovals based on observation of ic e galloping occurrences. Figure 1 - Ice Galloping ellipse for Phase Spacing Calculations [3] Other methods were developed in ensuant 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 three 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 s tatistical analysis of the field data. A fou! rth method of galloping control by means of every spoilers or VR conductor has also become available in juvenile years. Ice galloping motions occur at one of the radical 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 want to amount a full essay, order it on our website: OrderCustomPaper.com

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