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Comparison of heating curves of a rectangular busbar in different conditions of heat abstraction during the short-circuit heating

Zaręba M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 1

79--85

The paper compares heating curves for a rectangular busbar in the conditions of convective and adiabatic heat transfer during short-circuit heating. Different coefficients of heat transfer from the external surface of the busbar and different busbar cross-sections have been assumed. This has allowed determining the error value occurring when the adiabatic rather than convective boundary condition is presumed at short circuit. The analysis takes into account a change of resistivity in the temperature function. The respective boundary-initial problems have been solved with analytical methods using Green’s function. The calculated results show that no considerable errors occur for long-lasting short circuits with an adiabatic rather than convective boundary condition.