| In this paper numerical results coresponding to thermal regime of two types of superposed crimped connections has been obtained. The samples studied use copper wire crimped by two methods: the first method uses one crimp indents and the second method is with two crimp indents. The ferrule is a parallel one type. A 2D model of crimped connections has been created in QuickField Professional to obtain the numerical results. For obtaining temperature values, a coupled problem AC Magnetics – Steady-State Heat Transfer was solved. Numerical simulations were made considering the next values for electrical current intensity: 510 A, 682 A, 855 A, until the steady state regime is established. First, the AC Magnetics problem was solved to obtain the specific Joule heat. Then, the source term was imported in steady state heat transfer problem to solve it. Joule Heat and temperature values are presented and discussed. An important parameter in numerical simulations is heat transfer coefficient which depends on overtemperature. Knowing heat transfer coefficient law and using in numerical simulation can be obtained the real numerical temperature values. The temperature dependence of global heat transfer coefficient has been taking into account into numerical simulations. Finally, obtained numerical results are discussed and proposals are made. |
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