双断触点上的吹开力

Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts Pub Date : 1993-09-27 DOI:10.1109/HOLM.1993.489666

John J. Shea, B. DeVault, Y. Chien

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引用次数: 25

摘要

对配电设备中常用的双断触点几何形状进行了测量，以确定各种短路故障条件下的触点动力学。这些测量导致了在短路期间改善接触动力学的修改。修改包括一个导杆，防止接触臂旋转期间电弧。接触动力学取决于两个吹开力，磁斥力和气体压力。这两种力都量化了各种双断接触几何形状以及电弧电压和接触行程。由电弧辐射产生的气体压力被发现是一个重要的吹开力。将实测的吹开力与密封活塞模型进行了比较，得到了吹开力的经验方程。在电弧电流范围内，还测定了有导杆和没有导杆的接触性能。

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Blow-open forces on double-break contacts

Measurements were made on a double-break contact geometries, commonly used in power distribution devices, to determine contact dynamics under various short circuit fault conditions. These measurements lead to a modification to improve contact dynamics during a short circuit. The modification consisted of a guide-rod which prevented contact arm rotation during arcing. Contact dynamics depended on two blow-open forces, magnetic repulsion and gas pressure. Both forces were quantified for various double-break contact geometries along with arc voltage and contact travel. The gas pressure, created by arc radiation, was found to be a significant blow-open force. Measured blow-open forces were compared to a sealed piston model to obtain an empirical equation for blow-open forces. Contact performance was also determined with and without the guide-rod for a range of arc currents.

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Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts

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