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.
Highlights
Aluminum cable steel reinforced (ACSR) conductors that are the key component of the high-voltage transmission line are widely used in electric transmission systems around the world, especially in China [1]
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
The primary aim of this study is to investigate the main reasons for the breakage of 500 kV transmission line
Summary
Aluminum cable steel reinforced (ACSR) conductors that are the key component of the high-voltage transmission line are widely used in electric transmission systems around the world, especially in China [1]. As another important electric fitting of the high-voltage transmission line, strain clamp should meet the transmission function of mechanical and electrical loading in ACSR conductors across towers. Mechanical property test of strain clamps for crimping into different locations on the aluminum tube were carried out. The study will contribute to the further enhancement of the safety and the improvement of the performance for high-voltage transmission lines
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