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L. -G. Bujoreanu, N. M. Lohan, Marius-Gabriel SURU, A. Plesca. Thermal analysis of eutectic alloy at HBC fuses. Journal of Optoelectronics and Advanced Materials, Vol. 17, No. 9-10, pp. 1500-1506, 2015.

Abstract: Fuses are one of the most used electrical apparatus to protect different type of electrical installations against overloads and short circuits. In this paper, the metallurgical (M)-effect under different overloads has been experimentally established, by analyzing the evolution of executive eutectic element at different heating rates. Two mathematical functions were derived aiming to approximate the dissolution depth variation against time and temperatures, during the service of a high breaking capacity (HBC) device. One of the equations, of exponential type, can be used with good accuracy in the range of low temperatures while the other one, a compact equation, is more suitable for high heating temperatures of the eutectic alloy, actually corresponding to high overloads. The comparison between experimental and analytical results validates the applicability of the proposed mathematical models of the dissolution depth. The eutectic alloy was investigated by differential scanning calorimetry (DSC) and optical microscopy (OM) and a correlation between heating rate, melting temperatures and eutectic morphology was discussed.

Keywords: mathematical model, eutectic alloy, HBC fuse, DSC thermogram, OM microstructure


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