In this paper. the knowledge based design of digital filter for analysis of spectral components is illustrated. The primary electrical values are analyzed observing of the faults which appear by earth short circuits. The main point of view is negative sequence component and higher harmonics in distributed electrical networks. https://www.bekindtopets.com/best-grab-Goulds-Water-Technology-Submersible-Sump-Pump-LSP0711F-save-more/