Materials Transactions Online

Materials Transactions, Vol.47 No.09 (2006) pp.2413-2420
© 2006 The Japan Institute of Metals

Temperature Simulation of Pb-Free Sn-9Zn Elements for a Low Voltage Fuse

Kazuhiro Matsugi1, Gen Sasaki1, Osamu Yanagisawa1, Yasuo Kumagai2 and Koji Fujii2

1Department of Mechanical Materials Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
2The Chugoku Electric Power Co. Inc., Hiroshima, 730-8701, Japan

The distribution of the temperature was estimated by combination of electrical and thermal calculations on the basis of Ohm's and Fourier's laws in the fuse element-connector-electric wire system in order to design Pb-free Sn-9Zn fuse elements used in electric power line. The temperature distributions in fuses were obtained on the basis of the amount of Joule's heat generation and heat transfer depending on the ratio of the length and diameter of fuse elements. Main requirements for AC-low voltage fuses were satisfied on the promising fuse element with the size designed on the basis of the heat generation and transfer calculations. The promising size was the diameter of 2.5 mm and length of 10 mm in the smaller diameter part of two step cylindrical fuse elements. In contrast, the electrical potential and temperature distributions can be also estimated by this calculation method, regardless of a kind and shape of the fuse elements, connectors and electric wires.

(Received 2006/5/1; Accepted 2006/7/21; Published 2006/9/15)

Keywords: temperature simulation, lead-free tin-zinc alloy, fuse element, environmentally friendly materials, voltage distribution, substitute material

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