Useful Experiment Based Formulas for Estimating the Heating of Crimped Connections

In this work, some useful formulas based on experimental determinations are presented that can be used to estimate the heating of crimped connections, saving the experimenter from additional, long and expensive tests. The study is carried out within a heating cycle in a steady-state regime of a set of 6 crimped connections at a test current of a value at most equal to the rated current. There are standards that allow the estimation of heating elements in the circuit at small variations of the test current around the real used value. In this sense, formulas were determined with which these estimates can be made. For a more precise evaluation, the variation with temperature of the electrical resistance of the 6 connectors was also taken into account, determining a global temperature coefficient of resistance, specific to the studied circuit. The formulas have been validated for several types of crimped connections used in the construction of electrical machines. The results validate the proposed formulas and even extend their validity range for larger variations of the test current around the real used value.