Analysis of parallel groove clamp with finite element method

Proceedings of the Forth-Seventh IEEE Holm Conference on Electrical Contacts (IEEE Cat. No.01CH37192) Pub Date : 2001-09-10 DOI:10.1109/HOLM.2001.953216

Guoping Luo, Laing-Jun Xu, Ji-gao Zhang

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引用次数: 2

Abstract

Due to its simple structure, easy installation and low cost, bolt-type power connector, the parallel groove clamp is widely used in overhead power transmission and distribution lines. However, due to high and fluctuating current loads and harsh environments in China, there are many problems in application of this kind of connector. After analysis of failed connectors collected from Chinese overhead power lines, the main failure causes were found (Luo et al., 1999). For further understanding and simulation in the lab, electrical current tests for parallel groove clamps were conducted and finite element analysis was used to simulate the failure process. Some useful results are summarized and described in this paper. (1) Bolt tension force linearly increases with temperature rise. The force increase rate is up to 43.98 N//spl deg/C. Thus, oxidation on contact surfaces is accelerated and contact resistance increases accordingly. (2) Vibration model FEM analysis shows that there are many kinds of vibration modes for parallel groove clamps, including clamp shaking, rocking and swinging and relative motion between upper and lower covers. The scope of mode frequency is close to vibration of overhead power lines induced by wind, which may cause two-thirds of failed samples with obvious fretting wear morphology at contact interfaces. (3) Imbalance of contact resistance among clamps and connected wires may cause electric current to pass through the bolts, increasing temperature rise and accelerating bolt stress relaxation. (4) Contact force, film resistance and fretting at the contact interfaces are the key points of connector failure.

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用有限元法分析平行槽式夹具

螺栓式电源连接器由于其结构简单、安装方便、成本低等优点，在架空输配电线路中得到了广泛的应用。然而，由于国内电流负载大且波动，环境恶劣，这种连接器在应用中存在许多问题。通过对中国架空电力线路中收集的故障连接器进行分析，发现了主要故障原因(Luo et al.， 1999)。为了进一步了解并在实验室进行模拟，对平行槽夹钳进行了电流试验，并采用有限元分析对其失效过程进行了模拟。本文总结和描述了一些有用的结果。(1)螺栓拉力随温度升高线性增大。受力增加速率可达43.98 N//spl℃。因此，接触面上的氧化加速，接触电阻相应增加。(2)振动模型有限元分析表明，平行槽卡钳存在多种振动模式，包括卡钳振动、摆动和上下盖相对运动。模态频率范围接近架空电力线的风激振动，三分之二的失效试样在接触界面处出现明显的微动磨损形貌。(3)夹钳与连接线接触电阻不平衡，会使电流通过螺栓，使温升升高，加速螺栓应力松弛。(4)接触力、膜阻力和接触界面处的微动是连接器失效的关键点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the Forth-Seventh IEEE Holm Conference on Electrical Contacts (IEEE Cat. No.01CH37192)

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