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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v12.i3-4.50
pages 345-364

PRE-ARCING TIMES IN HBC FUSE FOR HIGH FAULT CURRENTS. COMPARISON BETWEEN SIMULATION AND EXPERIMENT

S. Memiaghe
Laboratoire Arc Electrique et Plasmas Thermiques CNRS FRE 3120, Phys. Bât. 5 - Université Blaise Pascal, Aubière Cedex, France; and P.R.E.S. Clermont Université, Clermont-Ferrand Cedex 1, France
W. Bussiere
LAEPT CNRS UMR 6069 - Phys. Bat. 5 - Université Blaise Pascal - 24, Avenue des Landais - 63177 Aubiere Cedex - France; and P.R.E.S.Clermont Université, 9 rue Kessler B.P. 10448 63012 Clermont-Ferrand Cedex 1, France
D. Rochette
Laboratoire Arc Electrique et Plasmas Thermiques CNRS FRE 3120, Phys. Bât. 5 - Université Blaise Pascal, Aubière Cedex, France; and P.R.E.S. Clermont Université, Clermont-Ferrand Cedex 1, France
R. Touzani
Laboratoire de Mathématiques CNRS UMR 6620, Campus Universitaire des Cézeaux, 24 Avenue des Landais, F63177 Aubière Cedex, France; P.R.E.S.Clermont Université, 9 rue Kessler B.P. 10448 63012 Clermont-Ferrand Cedex 1
P. Andre
Laboratoire Arc Electrique et Plasmas Thermiques CNRS FRE 3120, Phys. Bât. 5 - Université Blaise Pascal, Aubière Cedex, France; and P.R.E.S. Clermont Université, Clermont-Ferrand Cedex 1, France

ABSTRACT

This work deals with the calculation of pre-arcing time in the case of High Breaking Capacity fuses submitted to high fault currents. The fuse elements studied consist of silver fuse strips with reduced sections in their centre. During the fuse working the fuse element is fused partly and hence vaporized. The time necessary to obtain an electric arc is called the pre-arcing time. This latter is defined by the duration from the appearance of the fault current to the splitting of the fuse element due to the vaporization of the reduced sections. The mathematic model is based on the solution of the heat transfer Eq., using an enthalpy formulation to take into account the phase transitions, supplemented by an energy source due to the heat produced by ohmic losses. In order to determine the current density evolution in the fuse element, the Laplace Eq. governing the electric potential and the Ohm's law are used. Two typical fuse elements close to industrial ones are chosen for the simulations. The calculated pre-arcing times are given together with the main electrical properties, and compared with the experimental values. The resistive case with cos φ ∼ 0.9 is discussed for a 2.5 mm and 7.5 mm-width elements respectively with one and three reduced sections.


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