Study of the movable contact fallback phenomenon in MCCB

2021 IEEE 66th Holm Conference on Electrical Contacts (HLM) Pub Date : 2021-10-24 DOI:10.1109/HLM51431.2021.9671104

Xiaofeng Bai, Zijie Liao, Qian Wang, Jianning Yin, Xingwen Li

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Abstract

Movable contact fallback may have disadvantageous effect on the interruption performance of low voltage molded case circuit breaker (MCCB). Based on short circuit experiments of one MCCB product, the occurrence of movable contact fallback phenomenon was predicted. In order to analyze the phenomenon more detailed, a multi-physical coupled model was proposed to simulate the interruption process. The model included three parts: firstly, the dynamic model of the operation mechanism was developed by ADAMS software, and its validity was verified by measuring the angular displacement of the main axis; secondly, the electro-magnetic forces acting on the movable contact and the armature of the magnetic release were calculated based on finite element method; finally, by embedding some self-programmed codes into ADAMS software to consider the above-mentioned electro-magnetic forces, the whole interruption process could be simulated. It demonstrates that the proposed model could be used to evaluate the interruption performance of MCCB qualitatively, especially for the movable contact fallback phenomenon.

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断路器动触头回退现象的研究

动触点回退对低压塑壳断路器的断电性能有不利影响。通过某塑壳断路器产品的短路试验，预测了活动触点回退现象的发生。为了更详细地分析这一现象，提出了一个多物理耦合模型来模拟中断过程。该模型包括三个部分:首先，利用ADAMS软件建立了操作机构的动力学模型，并通过测量主轴角位移验证了其有效性;其次，基于有限元法计算了作用在动触点和磁释放电枢上的电磁力;最后，通过在ADAMS软件中嵌入一些考虑上述电磁力的自编代码，可以模拟整个中断过程。结果表明，该模型可以定性地评价断路器的中断性能，特别是可动触点回退现象。

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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2021 IEEE 66th Holm Conference on Electrical Contacts (HLM)

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