Research of the influence to the measurement unit of microcomputer distance protection from electric locomotive loads

What this paper study is the influence of electric locomotive loads to three kinds of measurement unit of microcomputer relay protection. A model is constructed by EMTDC/PSCAD, containing typical power grid and three kinds of measurement unit of microcomputer relay protection. The influence degree by electric locomotive loads to the Fourier algorithm, solving differential equation algorithm and first-order difference algorithm is discussed, using theories analysis combine with EMTDC/PSCAD simulation. The theoretical basis for the choice of measurement element is provided in the area where electrified railway is the primary load.