TITLE:
Analysis of Strain Clamp Failure on 500 kV Transmission Line
AUTHORS:
Mingcheng Sun, Che Tan, Chaoqun Zhang, Chao Yang, Hongqiang Li
KEYWORDS:
Transmission Line, Strain Clamp, Hydraulic Crimping Process
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.6 No.4,
April
12,
2018
ABSTRACT: In this work, the main reasons for the breakage of 500 kV transmission line are studied. Under low temperature condition, the coverage of the ice results in the disconnection between the aluminum tube and the steel anchor of strain clamp. Using macroscopic analysis, structure stress analysis, force analysis and mechanical property test, the fractured strain clamps are investigated. The crimping of the aluminum tube on the polished rod not on the grooves of the steel anchor leads to the damage of the strain clamps, which is defined as improper crimping. When improper crimping emerges, there will be only friction force between the aluminum tube and the steel anchor without shear force, and the tension of the conductor will be mainly supported by the steel strands which should be supported by both the aluminum tube and steel stands. Therefore, the breaking force of the strain clamp will greatly decrease. The failure analysis helps to promote the proper hydraulic crimping process and the safe operation of the transmission line.