Abstract
Glowing contacts may be precursors to arc faults and could lead to fire hazards even before arc faults occur. As of today there is no cost effective technology available to detect overheated or glowing contacts. Experiments have been conducted in order to investigate both the acoustic characteristics associated with glowing contacts and the feasibility of their detection under various conditions by employing acoustic sensing technology. Experimental results show that the propagation or attenuation of the acoustic signal through electrical circuits is significantly influenced by size and length of electric wires and types of electric connections. The results also further demonstrate that the acoustic signal can propagate effectively through large cable conductors and busbars, hence enable glowing contacts detection for industrial applications. However, the attenuation of acoustic signal through electrical circuit could be a potential limitation for residential applications.
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