In this work, the main reasons for the breakage of 500 kV transmission line\nare studied. Under low temperature condition, the coverage of the ice results\nin the disconnection between the aluminum tube and the steel anchor of\nstrain clamp. Using macroscopic analysis, structure stress analysis, force analysis\nand mechanical property test, the fractured strain clamps are investigated.\nThe crimping of the aluminum tube on the polished rod not on the grooves of\nthe steel anchor leads to the damage of the strain clamps, which is defined as\nimproper crimping. When improper crimping emerges, there will be only\nfriction force between the aluminum tube and the steel anchor without shear\nforce, and the tension of the conductor will be mainly supported by the steel\nstrands which should be supported by both the aluminum tube and steel\nstands. Therefore, the breaking force of the strain clamp will greatly decrease.\nThe failure analysis helps to promote the proper hydraulic crimping process\nand the safe operation of the transmission line.
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