The ice of coated wires of a transmission line can present an airfoil to the wind so that the wires will dance or gallop at amplitudes large enough that the entire line can be put out of service. For most utilities the galloping problem has been seen as a cause of service interruptions as clearances between phases and shield wires are reduced and flashovers result. Less frequent but of greater long term consequence are the sometimes large forces generated by the galloping wires that can lead to the breakage and distortion of the wire system and at times lead to the destruction of the support system itself.
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