Curve Fitting Analysis of Expulsion Fuse Links through the Cross-Validation Technique

The most common protective device in distribution systems is the expulsion fuse link. This work aims to assist the engineer in carrying out expulsion fuse links modeling using curve fitting. The proposed approach used the fuse time-current characteristic to obtain the polynomial function that represent the fuse link model. Preferred K and H fuses were used. The polynomial coefficients was obtained through the MATLAB software. The polynomial order that best represents the fuse link was decided using the cross-validation technique. The technique consists of iteratively partitioning the data set, separating test points and training points on each iteration.