Curve Fitting of Type-K Expulsion Fuse

The Minimum Melting Time Curves of type K expulsion fuses were obtained by means of a computational tool. Curve fitting was done by least squares polynomial regression. A problem encountered with Protection Coordination in electrical systems is when the operating curve of the fuses is not available. Visually collected values were used, and times were obtained at which the fuse element melts and interrupts the flow of current. This is convenient for the user to obtain the fuse operating characteristic curves without the need for manual modeling