Tests and numerical analysis for disconnected impact of overhead line strain clamps on safety backup clamps

HOU Chao1, ZHAO Liangchen1, ZHANG Zhao2

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (17) : 224-231.

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PDF(1385 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (17) : 224-231.

Tests and numerical analysis for disconnected impact of overhead line strain clamps on safety backup clamps

  • HOU Chao1, ZHAO Liangchen1, ZHANG Zhao2
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Abstract

To investigate the impact load of the backup safety clamp and the mechanical response of the key position of the line when the strain clamp broke, a finite element model of the coupling of the strain clamp-backup safety clamp-conductor was established. Taking the JL / G1A-630 / 45-45 / 7 conductor as the object, the process of the backup safety clamp bearing the impact load alone after the strain clamp disconnected was simulated and the changes in tension at key positions of the backup safety clamp, following the disconnection of the strain clamp under various spans and height differences, were analyzed. To validate the model, several sets of safety standby clamps underwent impact tests involving strain clamps. It was found that an increased span and height difference resulted in heightened extreme values of node tension and prolonged vibration periods of the conductor near the backup safety clamp. At a 500 m span, the tension's extreme value and vibration period increased by 32.08% and 140.23%, respectively, compared to a 150 m span. The occurrence of ice-shedding jump will reduce the extreme value of node tension and the vibration period of conductor near the backup safety clamp. The established finite element model was utilized for numerical simulations of the strain clamp’s breaking impact. To prevent conductor damage caused by the strain clamp’s breaking impact, it is recommended to limit the span to less than 500 m and to lower the height of the suspension points.

Key words

Strain clamp / Backup safety clamp / Finite element analysis / Disconnected impacts

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HOU Chao1, ZHAO Liangchen1, ZHANG Zhao2. Tests and numerical analysis for disconnected impact of overhead line strain clamps on safety backup clamps[J]. Journal of Vibration and Shock, 2024, 43(17): 224-231

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